diff options
Diffstat (limited to 'drivers/gpu/drm/mcde/mcde_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/mcde/mcde_dsi.c | 1246 |
1 files changed, 1246 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c new file mode 100644 index 000000000..64e6fb806 --- /dev/null +++ b/drivers/gpu/drm/mcde/mcde_dsi.c @@ -0,0 +1,1246 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include <linux/clk.h> +#include <linux/component.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <video/mipi_display.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_encoder.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_modeset_helper_vtables.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> + +#include "mcde_drm.h" +#include "mcde_dsi_regs.h" + +#define DSI_DEFAULT_LP_FREQ_HZ 19200000 +#define DSI_DEFAULT_HS_FREQ_HZ 420160000 + +/* PRCMU DSI reset registers */ +#define PRCM_DSI_SW_RESET 0x324 +#define PRCM_DSI_SW_RESET_DSI0_SW_RESETN BIT(0) +#define PRCM_DSI_SW_RESET_DSI1_SW_RESETN BIT(1) +#define PRCM_DSI_SW_RESET_DSI2_SW_RESETN BIT(2) + +struct mcde_dsi { + struct device *dev; + struct mcde *mcde; + struct drm_bridge bridge; + struct drm_panel *panel; + struct drm_bridge *bridge_out; + struct mipi_dsi_host dsi_host; + struct mipi_dsi_device *mdsi; + const struct drm_display_mode *mode; + struct clk *hs_clk; + struct clk *lp_clk; + unsigned long hs_freq; + unsigned long lp_freq; + bool unused; + + void __iomem *regs; + struct regmap *prcmu; +}; + +static inline struct mcde_dsi *bridge_to_mcde_dsi(struct drm_bridge *bridge) +{ + return container_of(bridge, struct mcde_dsi, bridge); +} + +static inline struct mcde_dsi *host_to_mcde_dsi(struct mipi_dsi_host *h) +{ + return container_of(h, struct mcde_dsi, dsi_host); +} + +bool mcde_dsi_irq(struct mipi_dsi_device *mdsi) +{ + struct mcde_dsi *d; + u32 val; + bool te_received = false; + + d = host_to_mcde_dsi(mdsi->host); + + dev_dbg(d->dev, "%s called\n", __func__); + + val = readl(d->regs + DSI_DIRECT_CMD_STS_FLAG); + if (val) + dev_dbg(d->dev, "DSI_DIRECT_CMD_STS_FLAG = %08x\n", val); + if (val & DSI_DIRECT_CMD_STS_WRITE_COMPLETED) + dev_dbg(d->dev, "direct command write completed\n"); + if (val & DSI_DIRECT_CMD_STS_TE_RECEIVED) { + te_received = true; + dev_dbg(d->dev, "direct command TE received\n"); + } + if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED) + dev_err(d->dev, "direct command ACK ERR received\n"); + if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR) + dev_err(d->dev, "direct command read ERR received\n"); + /* Mask off the ACK value and clear status */ + writel(val, d->regs + DSI_DIRECT_CMD_STS_CLR); + + val = readl(d->regs + DSI_CMD_MODE_STS_FLAG); + if (val) + dev_dbg(d->dev, "DSI_CMD_MODE_STS_FLAG = %08x\n", val); + if (val & DSI_CMD_MODE_STS_ERR_NO_TE) + /* This happens all the time (safe to ignore) */ + dev_dbg(d->dev, "CMD mode no TE\n"); + if (val & DSI_CMD_MODE_STS_ERR_TE_MISS) + /* This happens all the time (safe to ignore) */ + dev_dbg(d->dev, "CMD mode TE miss\n"); + if (val & DSI_CMD_MODE_STS_ERR_SDI1_UNDERRUN) + dev_err(d->dev, "CMD mode SD1 underrun\n"); + if (val & DSI_CMD_MODE_STS_ERR_SDI2_UNDERRUN) + dev_err(d->dev, "CMD mode SD2 underrun\n"); + if (val & DSI_CMD_MODE_STS_ERR_UNWANTED_RD) + dev_err(d->dev, "CMD mode unwanted RD\n"); + writel(val, d->regs + DSI_CMD_MODE_STS_CLR); + + val = readl(d->regs + DSI_DIRECT_CMD_RD_STS_FLAG); + if (val) + dev_dbg(d->dev, "DSI_DIRECT_CMD_RD_STS_FLAG = %08x\n", val); + writel(val, d->regs + DSI_DIRECT_CMD_RD_STS_CLR); + + val = readl(d->regs + DSI_TG_STS_FLAG); + if (val) + dev_dbg(d->dev, "DSI_TG_STS_FLAG = %08x\n", val); + writel(val, d->regs + DSI_TG_STS_CLR); + + val = readl(d->regs + DSI_VID_MODE_STS_FLAG); + if (val) + dev_dbg(d->dev, "DSI_VID_MODE_STS_FLAG = %08x\n", val); + if (val & DSI_VID_MODE_STS_VSG_RUNNING) + dev_dbg(d->dev, "VID mode VSG running\n"); + if (val & DSI_VID_MODE_STS_ERR_MISSING_DATA) + dev_err(d->dev, "VID mode missing data\n"); + if (val & DSI_VID_MODE_STS_ERR_MISSING_HSYNC) + dev_err(d->dev, "VID mode missing HSYNC\n"); + if (val & DSI_VID_MODE_STS_ERR_MISSING_VSYNC) + dev_err(d->dev, "VID mode missing VSYNC\n"); + if (val & DSI_VID_MODE_STS_REG_ERR_SMALL_LENGTH) + dev_err(d->dev, "VID mode less bytes than expected between two HSYNC\n"); + if (val & DSI_VID_MODE_STS_REG_ERR_SMALL_HEIGHT) + dev_err(d->dev, "VID mode less lines than expected between two VSYNC\n"); + if (val & (DSI_VID_MODE_STS_ERR_BURSTWRITE | + DSI_VID_MODE_STS_ERR_LINEWRITE | + DSI_VID_MODE_STS_ERR_LONGREAD)) + dev_err(d->dev, "VID mode read/write error\n"); + if (val & DSI_VID_MODE_STS_ERR_VRS_WRONG_LENGTH) + dev_err(d->dev, "VID mode received packets differ from expected size\n"); + if (val & DSI_VID_MODE_STS_VSG_RECOVERY) + dev_err(d->dev, "VID mode VSG in recovery mode\n"); + writel(val, d->regs + DSI_VID_MODE_STS_CLR); + + return te_received; +} + +static void mcde_dsi_attach_to_mcde(struct mcde_dsi *d) +{ + d->mcde->mdsi = d->mdsi; + + /* + * Select the way the DSI data flow is pushing to the display: + * currently we just support video or command mode depending + * on the type of display. Video mode defaults to using the + * formatter itself for synchronization (stateless video panel). + * + * FIXME: add flags to struct mipi_dsi_device .flags to indicate + * displays that require BTA (bus turn around) so we can handle + * such displays as well. Figure out how to properly handle + * single frame on-demand updates with DRM for command mode + * displays (MCDE_COMMAND_ONESHOT_FLOW). + */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) + d->mcde->flow_mode = MCDE_VIDEO_FORMATTER_FLOW; + else + d->mcde->flow_mode = MCDE_COMMAND_TE_FLOW; +} + +static int mcde_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *mdsi) +{ + struct mcde_dsi *d = host_to_mcde_dsi(host); + + if (mdsi->lanes < 1 || mdsi->lanes > 2) { + DRM_ERROR("dsi device params invalid, 1 or 2 lanes supported\n"); + return -EINVAL; + } + + dev_info(d->dev, "attached DSI device with %d lanes\n", mdsi->lanes); + /* MIPI_DSI_FMT_RGB88 etc */ + dev_info(d->dev, "format %08x, %dbpp\n", mdsi->format, + mipi_dsi_pixel_format_to_bpp(mdsi->format)); + dev_info(d->dev, "mode flags: %08lx\n", mdsi->mode_flags); + + d->mdsi = mdsi; + if (d->mcde) + mcde_dsi_attach_to_mcde(d); + + return 0; +} + +static int mcde_dsi_host_detach(struct mipi_dsi_host *host, + struct mipi_dsi_device *mdsi) +{ + struct mcde_dsi *d = host_to_mcde_dsi(host); + + d->mdsi = NULL; + if (d->mcde) + d->mcde->mdsi = NULL; + + return 0; +} + +#define MCDE_DSI_HOST_IS_READ(type) \ + ((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \ + (type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \ + (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \ + (type == MIPI_DSI_DCS_READ)) + +static int mcde_dsi_execute_transfer(struct mcde_dsi *d, + const struct mipi_dsi_msg *msg) +{ + const u32 loop_delay_us = 10; /* us */ + u32 loop_counter; + size_t txlen = msg->tx_len; + size_t rxlen = msg->rx_len; + int i; + u32 val; + int ret; + + writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR); + writel(~0, d->regs + DSI_CMD_MODE_STS_CLR); + /* Send command */ + writel(1, d->regs + DSI_DIRECT_CMD_SEND); + + loop_counter = 1000 * 1000 / loop_delay_us; + if (MCDE_DSI_HOST_IS_READ(msg->type)) { + /* Read command */ + while (!(readl(d->regs + DSI_DIRECT_CMD_STS) & + (DSI_DIRECT_CMD_STS_READ_COMPLETED | + DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR)) + && --loop_counter) + usleep_range(loop_delay_us, (loop_delay_us * 3) / 2); + if (!loop_counter) { + dev_err(d->dev, "DSI read timeout!\n"); + /* Set exit code and retry */ + return -ETIME; + } + } else { + /* Writing only */ + while (!(readl(d->regs + DSI_DIRECT_CMD_STS) & + DSI_DIRECT_CMD_STS_WRITE_COMPLETED) + && --loop_counter) + usleep_range(loop_delay_us, (loop_delay_us * 3) / 2); + + if (!loop_counter) { + /* Set exit code and retry */ + dev_err(d->dev, "DSI write timeout!\n"); + return -ETIME; + } + } + + val = readl(d->regs + DSI_DIRECT_CMD_STS); + if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR) { + dev_err(d->dev, "read completed with error\n"); + writel(1, d->regs + DSI_DIRECT_CMD_RD_INIT); + return -EIO; + } + if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED) { + val >>= DSI_DIRECT_CMD_STS_ACK_VAL_SHIFT; + dev_err(d->dev, "error during transmission: %04x\n", + val); + return -EIO; + } + + if (!MCDE_DSI_HOST_IS_READ(msg->type)) { + /* Return number of bytes written */ + ret = txlen; + } else { + /* OK this is a read command, get the response */ + u32 rdsz; + u32 rddat; + u8 *rx = msg->rx_buf; + + rdsz = readl(d->regs + DSI_DIRECT_CMD_RD_PROPERTY); + rdsz &= DSI_DIRECT_CMD_RD_PROPERTY_RD_SIZE_MASK; + rddat = readl(d->regs + DSI_DIRECT_CMD_RDDAT); + if (rdsz < rxlen) { + dev_err(d->dev, "read error, requested %zd got %d\n", + rxlen, rdsz); + return -EIO; + } + /* FIXME: read more than 4 bytes */ + for (i = 0; i < 4 && i < rxlen; i++) + rx[i] = (rddat >> (i * 8)) & 0xff; + ret = rdsz; + } + + /* Successful transmission */ + return ret; +} + +static ssize_t mcde_dsi_host_transfer(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg) +{ + struct mcde_dsi *d = host_to_mcde_dsi(host); + const u8 *tx = msg->tx_buf; + size_t txlen = msg->tx_len; + size_t rxlen = msg->rx_len; + unsigned int retries = 0; + u32 val; + int ret; + int i; + + if (txlen > 16) { + dev_err(d->dev, + "dunno how to write more than 16 bytes yet\n"); + return -EIO; + } + if (rxlen > 4) { + dev_err(d->dev, + "dunno how to read more than 4 bytes yet\n"); + return -EIO; + } + + dev_dbg(d->dev, + "message to channel %d, write %zd bytes read %zd bytes\n", + msg->channel, txlen, rxlen); + + /* Command "nature" */ + if (MCDE_DSI_HOST_IS_READ(msg->type)) + /* MCTL_MAIN_DATA_CTL already set up */ + val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_READ; + else + val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_WRITE; + /* + * More than 2 bytes will not fit in a single packet, so it's + * time to set the "long not short" bit. One byte is used by + * the MIPI DCS command leaving just one byte for the payload + * in a short package. + */ + if (mipi_dsi_packet_format_is_long(msg->type)) + val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LONGNOTSHORT; + val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT; + val |= txlen << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT; + val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN; + val |= msg->type << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT; + writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS); + + /* MIPI DCS command is part of the data */ + if (txlen > 0) { + val = 0; + for (i = 0; i < 4 && i < txlen; i++) + val |= tx[i] << (i * 8); + } + writel(val, d->regs + DSI_DIRECT_CMD_WRDAT0); + if (txlen > 4) { + val = 0; + for (i = 0; i < 4 && (i + 4) < txlen; i++) + val |= tx[i + 4] << (i * 8); + writel(val, d->regs + DSI_DIRECT_CMD_WRDAT1); + } + if (txlen > 8) { + val = 0; + for (i = 0; i < 4 && (i + 8) < txlen; i++) + val |= tx[i + 8] << (i * 8); + writel(val, d->regs + DSI_DIRECT_CMD_WRDAT2); + } + if (txlen > 12) { + val = 0; + for (i = 0; i < 4 && (i + 12) < txlen; i++) + val |= tx[i + 12] << (i * 8); + writel(val, d->regs + DSI_DIRECT_CMD_WRDAT3); + } + + while (retries < 3) { + ret = mcde_dsi_execute_transfer(d, msg); + if (ret >= 0) + break; + retries++; + } + if (ret < 0 && retries) + dev_err(d->dev, "gave up after %d retries\n", retries); + + /* Clear any errors */ + writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR); + writel(~0, d->regs + DSI_CMD_MODE_STS_CLR); + + return ret; +} + +static const struct mipi_dsi_host_ops mcde_dsi_host_ops = { + .attach = mcde_dsi_host_attach, + .detach = mcde_dsi_host_detach, + .transfer = mcde_dsi_host_transfer, +}; + +/* This sends a direct (short) command to request TE */ +void mcde_dsi_te_request(struct mipi_dsi_device *mdsi) +{ + struct mcde_dsi *d; + u32 val; + + d = host_to_mcde_dsi(mdsi->host); + + /* Command "nature" TE request */ + val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_TE_REQ; + val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT; + val |= 2 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT; + val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN; + val |= MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM << + DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT; + writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS); + + /* Clear TE reveived and error status bits and enables them */ + writel(DSI_DIRECT_CMD_STS_CLR_TE_RECEIVED_CLR | + DSI_DIRECT_CMD_STS_CLR_ACKNOWLEDGE_WITH_ERR_RECEIVED_CLR, + d->regs + DSI_DIRECT_CMD_STS_CLR); + val = readl(d->regs + DSI_DIRECT_CMD_STS_CTL); + val |= DSI_DIRECT_CMD_STS_CTL_TE_RECEIVED_EN; + val |= DSI_DIRECT_CMD_STS_CTL_ACKNOWLEDGE_WITH_ERR_EN; + writel(val, d->regs + DSI_DIRECT_CMD_STS_CTL); + + /* Clear and enable no TE or TE missing status */ + writel(DSI_CMD_MODE_STS_CLR_ERR_NO_TE_CLR | + DSI_CMD_MODE_STS_CLR_ERR_TE_MISS_CLR, + d->regs + DSI_CMD_MODE_STS_CLR); + val = readl(d->regs + DSI_CMD_MODE_STS_CTL); + val |= DSI_CMD_MODE_STS_CTL_ERR_NO_TE_EN; + val |= DSI_CMD_MODE_STS_CTL_ERR_TE_MISS_EN; + writel(val, d->regs + DSI_CMD_MODE_STS_CTL); + + /* Send this TE request command */ + writel(1, d->regs + DSI_DIRECT_CMD_SEND); +} + +static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, + const struct drm_display_mode *mode) +{ + /* cpp, characters per pixel, number of bytes per pixel */ + u8 cpp = mipi_dsi_pixel_format_to_bpp(d->mdsi->format) / 8; + u64 pclk; + u64 bpl; + int hfp; + int hbp; + int hsa; + u32 blkline_pck, line_duration; + u32 val; + + val = 0; + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) + val |= DSI_VID_MAIN_CTL_BURST_MODE; + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { + val |= DSI_VID_MAIN_CTL_SYNC_PULSE_ACTIVE; + val |= DSI_VID_MAIN_CTL_SYNC_PULSE_HORIZONTAL; + } + /* RGB header and pixel mode */ + switch (d->mdsi->format) { + case MIPI_DSI_FMT_RGB565: + val |= MIPI_DSI_PACKED_PIXEL_STREAM_16 << + DSI_VID_MAIN_CTL_HEADER_SHIFT; + val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_16BITS; + break; + case MIPI_DSI_FMT_RGB666_PACKED: + val |= MIPI_DSI_PACKED_PIXEL_STREAM_18 << + DSI_VID_MAIN_CTL_HEADER_SHIFT; + val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS; + break; + case MIPI_DSI_FMT_RGB666: + val |= MIPI_DSI_PIXEL_STREAM_3BYTE_18 + << DSI_VID_MAIN_CTL_HEADER_SHIFT; + val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS_LOOSE; + break; + case MIPI_DSI_FMT_RGB888: + val |= MIPI_DSI_PACKED_PIXEL_STREAM_24 << + DSI_VID_MAIN_CTL_HEADER_SHIFT; + val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_24BITS; + break; + default: + dev_err(d->dev, "unknown pixel mode\n"); + return; + } + + /* TODO: TVG (test video generator) could be enabled here */ + + /* + * During vertical blanking: go to LP mode + * Like with the EOL setting, if this is not set, the EOL area will be + * filled with NULL or blanking packets in the vblank area. + * FIXME: some Samsung phones and display panels such as s6e63m0 use + * DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_BLANKING here instead, + * figure out how to properly configure that from the panel. + */ + val |= DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_LP_0; + /* + * During EOL: go to LP mode. If this is not set, the EOL area will be + * filled with NULL or blanking packets. + */ + val |= DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0; + /* Recovery mode 1 */ + val |= 1 << DSI_VID_MAIN_CTL_RECOVERY_MODE_SHIFT; + /* All other fields zero */ + writel(val, d->regs + DSI_VID_MAIN_CTL); + + /* Vertical frame parameters are pretty straight-forward */ + val = mode->vdisplay << DSI_VID_VSIZE_VACT_LENGTH_SHIFT; + /* vertical front porch */ + val |= (mode->vsync_start - mode->vdisplay) + << DSI_VID_VSIZE_VFP_LENGTH_SHIFT; + /* vertical sync active */ + val |= (mode->vsync_end - mode->vsync_start) + << DSI_VID_VSIZE_VSA_LENGTH_SHIFT; + /* vertical back porch */ + val |= (mode->vtotal - mode->vsync_end) + << DSI_VID_VSIZE_VBP_LENGTH_SHIFT; + writel(val, d->regs + DSI_VID_VSIZE); + + /* + * Horizontal frame parameters: + * horizontal resolution is given in pixels but must be re-calculated + * into bytes since this is what the hardware expects, these registers + * define the payload size of the packet. + * + * hfp = horizontal front porch in bytes + * hbp = horizontal back porch in bytes + * hsa = horizontal sync active in bytes + * + * 6 + 2 is HFP header + checksum + */ + hfp = (mode->hsync_start - mode->hdisplay) * cpp - 6 - 2; + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { + /* + * Use sync pulse for sync: explicit HSA time + * 6 is HBP header + checksum + * 4 is RGB header + checksum + */ + hbp = (mode->htotal - mode->hsync_end) * cpp - 4 - 6; + /* + * 6 is HBP header + checksum + * 4 is HSW packet bytes + * 4 is RGB header + checksum + */ + hsa = (mode->hsync_end - mode->hsync_start) * cpp - 4 - 4 - 6; + } else { + /* + * Use event for sync: HBP includes both back porch and sync + * 6 is HBP header + checksum + * 4 is HSW packet bytes + * 4 is RGB header + checksum + */ + hbp = (mode->htotal - mode->hsync_start) * cpp - 4 - 4 - 6; + /* HSA is not present in this mode and set to 0 */ + hsa = 0; + } + if (hfp < 0) { + dev_info(d->dev, "hfp negative, set to 0\n"); + hfp = 0; + } + if (hbp < 0) { + dev_info(d->dev, "hbp negative, set to 0\n"); + hbp = 0; + } + if (hsa < 0) { + dev_info(d->dev, "hsa negative, set to 0\n"); + hsa = 0; + } + dev_dbg(d->dev, "hfp: %u, hbp: %u, hsa: %u bytes\n", + hfp, hbp, hsa); + + /* Frame parameters: horizontal sync active */ + val = hsa << DSI_VID_HSIZE1_HSA_LENGTH_SHIFT; + /* horizontal back porch */ + val |= hbp << DSI_VID_HSIZE1_HBP_LENGTH_SHIFT; + /* horizontal front porch */ + val |= hfp << DSI_VID_HSIZE1_HFP_LENGTH_SHIFT; + writel(val, d->regs + DSI_VID_HSIZE1); + + /* RGB data length (visible bytes on one scanline) */ + val = mode->hdisplay * cpp; + writel(val, d->regs + DSI_VID_HSIZE2); + dev_dbg(d->dev, "RGB length, visible area on a line: %u bytes\n", val); + + /* + * Calculate the time between two pixels in picoseconds using + * the supplied refresh rate and total resolution including + * porches and sync. + */ + /* (ps/s) / (pixels/s) = ps/pixels */ + pclk = DIV_ROUND_UP_ULL(1000000000000, (mode->clock * 1000)); + dev_dbg(d->dev, "picoseconds between two pixels: %llu\n", + pclk); + + /* + * How many bytes per line will this update frequency yield? + * + * Calculate the number of picoseconds for one scanline (1), then + * divide by 1000000000000 (2) to get in pixels per second we + * want to output. + * + * Multiply with number of bytes per second at this video display + * frequency (3) to get number of bytes transferred during this + * time. Notice that we use the frequency the display wants, + * not what we actually get from the DSI PLL, which is hs_freq. + * + * These arithmetics are done in a different order to avoid + * overflow. + */ + bpl = pclk * mode->htotal; /* (1) picoseconds per line */ + dev_dbg(d->dev, "picoseconds per line: %llu\n", bpl); + /* Multiply with bytes per second (3) */ + bpl *= (d->mdsi->hs_rate / 8); + /* Pixels per second (2) */ + bpl = DIV_ROUND_DOWN_ULL(bpl, 1000000); /* microseconds */ + bpl = DIV_ROUND_DOWN_ULL(bpl, 1000000); /* seconds */ + /* parallel transactions in all lanes */ + bpl *= d->mdsi->lanes; + dev_dbg(d->dev, + "calculated bytes per line: %llu @ %d Hz with HS %lu Hz\n", + bpl, drm_mode_vrefresh(mode), d->mdsi->hs_rate); + + /* + * 6 is header + checksum, header = 4 bytes, checksum = 2 bytes + * 4 is short packet for vsync/hsync + */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { + /* Set the event packet size to 0 (not used) */ + writel(0, d->regs + DSI_VID_BLKSIZE1); + /* + * FIXME: isn't the hsync width in pixels? The porch and + * sync area size is in pixels here, but this -6 + * seems to be for bytes. It looks like this in the vendor + * code though. Is it completely untested? + */ + blkline_pck = bpl - (mode->hsync_end - mode->hsync_start) - 6; + val = blkline_pck << DSI_VID_BLKSIZE2_BLKLINE_PULSE_PCK_SHIFT; + writel(val, d->regs + DSI_VID_BLKSIZE2); + } else { + /* Set the sync pulse packet size to 0 (not used) */ + writel(0, d->regs + DSI_VID_BLKSIZE2); + /* Specifying payload size in bytes (-4-6 from manual) */ + blkline_pck = bpl - 4 - 6; + if (blkline_pck > 0x1FFF) + dev_err(d->dev, "blkline_pck too big %d bytes\n", + blkline_pck); + val = blkline_pck << DSI_VID_BLKSIZE1_BLKLINE_EVENT_PCK_SHIFT; + val &= DSI_VID_BLKSIZE1_BLKLINE_EVENT_PCK_MASK; + writel(val, d->regs + DSI_VID_BLKSIZE1); + } + + /* + * The line duration is used to scale back the frequency from + * the max frequency supported by the HS clock to the desired + * update frequency in vrefresh. + */ + line_duration = blkline_pck + 6; + /* + * The datasheet contains this complex condition to decreasing + * the line duration by 1 under very specific circumstances. + * Here we also imply that LP is used during burst EOL. + */ + if (d->mdsi->lanes == 2 && (hsa & 0x01) && (hfp & 0x01) + && (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)) + line_duration--; + line_duration = DIV_ROUND_CLOSEST(line_duration, d->mdsi->lanes); + dev_dbg(d->dev, "line duration %u bytes\n", line_duration); + val = line_duration << DSI_VID_DPHY_TIME_REG_LINE_DURATION_SHIFT; + /* + * This is the time to perform LP->HS on D-PHY + * FIXME: nowhere to get this from: DT property on the DSI? + * The manual says this is "system dependent". + * values like 48 and 72 seen in the vendor code. + */ + val |= 48 << DSI_VID_DPHY_TIME_REG_WAKEUP_TIME_SHIFT; + writel(val, d->regs + DSI_VID_DPHY_TIME); + + /* + * See the manual figure 657 page 2203 for understanding the impact + * of the different burst mode settings. + */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) { + int blkeol_pck, blkeol_duration; + /* + * Packet size at EOL for burst mode, this is only used + * if DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0 is NOT set, + * but we instead send NULL or blanking packets at EOL. + * This is given in number of bytes. + * + * See the manual page 2198 for the 13 reg_blkeol_pck bits. + */ + blkeol_pck = bpl - (mode->htotal * cpp) - 6; + if (blkeol_pck < 0) { + dev_err(d->dev, "video block does not fit on line!\n"); + dev_err(d->dev, + "calculated bytes per line: %llu @ %d Hz\n", + bpl, drm_mode_vrefresh(mode)); + dev_err(d->dev, + "bytes per line (blkline_pck) %u bytes\n", + blkline_pck); + dev_err(d->dev, + "blkeol_pck becomes %d bytes\n", blkeol_pck); + return; + } + dev_dbg(d->dev, "BLKEOL packet: %d bytes\n", blkeol_pck); + + val = readl(d->regs + DSI_VID_BLKSIZE1); + val &= ~DSI_VID_BLKSIZE1_BLKEOL_PCK_MASK; + val |= blkeol_pck << DSI_VID_BLKSIZE1_BLKEOL_PCK_SHIFT; + writel(val, d->regs + DSI_VID_BLKSIZE1); + /* Use the same value for exact burst limit */ + val = blkeol_pck << + DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_SHIFT; + val &= DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_MASK; + writel(val, d->regs + DSI_VID_VCA_SETTING2); + /* + * This BLKEOL duration is claimed to be the duration in clock + * cycles of the BLLP end-of-line (EOL) period for each line if + * DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0 is set. + * + * It is hard to trust the manuals' claim that this is in clock + * cycles as we mimic the behaviour of the vendor code, which + * appears to write a number of bytes that would have been + * transferred on a single lane. + * + * See the manual figure 657 page 2203 and page 2198 for the 13 + * reg_blkeol_duration bits. + * + * FIXME: should this also be set up also for non-burst mode + * according to figure 565 page 2202? + */ + blkeol_duration = DIV_ROUND_CLOSEST(blkeol_pck + 6, + d->mdsi->lanes); + dev_dbg(d->dev, "BLKEOL duration: %d clock cycles\n", + blkeol_duration); + + val = readl(d->regs + DSI_VID_PCK_TIME); + val &= ~DSI_VID_PCK_TIME_BLKEOL_DURATION_MASK; + val |= blkeol_duration << + DSI_VID_PCK_TIME_BLKEOL_DURATION_SHIFT; + writel(val, d->regs + DSI_VID_PCK_TIME); + + /* Max burst limit, this is given in bytes */ + val = readl(d->regs + DSI_VID_VCA_SETTING1); + val &= ~DSI_VID_VCA_SETTING1_MAX_BURST_LIMIT_MASK; + val |= (blkeol_pck - 6) << + DSI_VID_VCA_SETTING1_MAX_BURST_LIMIT_SHIFT; + writel(val, d->regs + DSI_VID_VCA_SETTING1); + } + + /* Maximum line limit */ + val = readl(d->regs + DSI_VID_VCA_SETTING2); + val &= ~DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_MASK; + val |= (blkline_pck - 6) << + DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_SHIFT; + writel(val, d->regs + DSI_VID_VCA_SETTING2); + dev_dbg(d->dev, "blkline pck: %d bytes\n", blkline_pck - 6); +} + +static void mcde_dsi_start(struct mcde_dsi *d) +{ + unsigned long hs_freq; + u32 val; + int i; + + /* No integration mode */ + writel(0, d->regs + DSI_MCTL_INTEGRATION_MODE); + + /* Enable the DSI port, from drivers/video/mcde/dsilink_v2.c */ + val = DSI_MCTL_MAIN_DATA_CTL_LINK_EN | + DSI_MCTL_MAIN_DATA_CTL_BTA_EN | + DSI_MCTL_MAIN_DATA_CTL_READ_EN | + DSI_MCTL_MAIN_DATA_CTL_REG_TE_EN; + if (!(d->mdsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET)) + val |= DSI_MCTL_MAIN_DATA_CTL_HOST_EOT_GEN; + writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL); + + /* Set a high command timeout, clear other fields */ + val = 0x3ff << DSI_CMD_MODE_CTL_TE_TIMEOUT_SHIFT; + writel(val, d->regs + DSI_CMD_MODE_CTL); + + /* + * UI_X4 is described as "unit interval times four" + * I guess since DSI packets are 4 bytes wide, one unit + * is one byte. + */ + hs_freq = clk_get_rate(d->hs_clk); + hs_freq /= 1000000; /* MHz */ + val = 4000 / hs_freq; + dev_dbg(d->dev, "UI value: %d\n", val); + val <<= DSI_MCTL_DPHY_STATIC_UI_X4_SHIFT; + val &= DSI_MCTL_DPHY_STATIC_UI_X4_MASK; + writel(val, d->regs + DSI_MCTL_DPHY_STATIC); + + /* + * Enable clocking: 0x0f (something?) between each burst, + * enable the second lane if needed, enable continuous clock if + * needed, enable switch into ULPM (ultra-low power mode) on + * all the lines. + */ + val = 0x0f << DSI_MCTL_MAIN_PHY_CTL_WAIT_BURST_TIME_SHIFT; + if (d->mdsi->lanes == 2) + val |= DSI_MCTL_MAIN_PHY_CTL_LANE2_EN; + if (!(d->mdsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) + val |= DSI_MCTL_MAIN_PHY_CTL_CLK_CONTINUOUS; + val |= DSI_MCTL_MAIN_PHY_CTL_CLK_ULPM_EN | + DSI_MCTL_MAIN_PHY_CTL_DAT1_ULPM_EN | + DSI_MCTL_MAIN_PHY_CTL_DAT2_ULPM_EN; + writel(val, d->regs + DSI_MCTL_MAIN_PHY_CTL); + + val = (1 << DSI_MCTL_ULPOUT_TIME_CKLANE_ULPOUT_TIME_SHIFT) | + (1 << DSI_MCTL_ULPOUT_TIME_DATA_ULPOUT_TIME_SHIFT); + writel(val, d->regs + DSI_MCTL_ULPOUT_TIME); + + writel(DSI_DPHY_LANES_TRIM_DPHY_SPECS_90_81B_0_90, + d->regs + DSI_DPHY_LANES_TRIM); + + /* High PHY timeout */ + val = (0x0f << DSI_MCTL_DPHY_TIMEOUT_CLK_DIV_SHIFT) | + (0x3fff << DSI_MCTL_DPHY_TIMEOUT_HSTX_TO_VAL_SHIFT) | + (0x3fff << DSI_MCTL_DPHY_TIMEOUT_LPRX_TO_VAL_SHIFT); + writel(val, d->regs + DSI_MCTL_DPHY_TIMEOUT); + + val = DSI_MCTL_MAIN_EN_PLL_START | + DSI_MCTL_MAIN_EN_CKLANE_EN | + DSI_MCTL_MAIN_EN_DAT1_EN | + DSI_MCTL_MAIN_EN_IF1_EN; + if (d->mdsi->lanes == 2) + val |= DSI_MCTL_MAIN_EN_DAT2_EN; + writel(val, d->regs + DSI_MCTL_MAIN_EN); + + /* Wait for the PLL to lock and the clock and data lines to come up */ + i = 0; + val = DSI_MCTL_MAIN_STS_PLL_LOCK | + DSI_MCTL_MAIN_STS_CLKLANE_READY | + DSI_MCTL_MAIN_STS_DAT1_READY; + if (d->mdsi->lanes == 2) + val |= DSI_MCTL_MAIN_STS_DAT2_READY; + while ((readl(d->regs + DSI_MCTL_MAIN_STS) & val) != val) { + /* Sleep for a millisecond */ + usleep_range(1000, 1500); + if (i++ == 100) { + dev_warn(d->dev, "DSI lanes did not start up\n"); + return; + } + } + + /* TODO needed? */ + + /* Command mode, clear IF1 ID */ + val = readl(d->regs + DSI_CMD_MODE_CTL); + /* + * If we enable low-power mode here, + * then display updates become really slow. + */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM) + val |= DSI_CMD_MODE_CTL_IF1_LP_EN; + val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK; + writel(val, d->regs + DSI_CMD_MODE_CTL); + + /* Wait for DSI PHY to initialize */ + usleep_range(100, 200); + dev_info(d->dev, "DSI link enabled\n"); +} + +/* + * Notice that this is called from inside the display controller + * and not from the bridge callbacks. + */ +void mcde_dsi_enable(struct drm_bridge *bridge) +{ + struct mcde_dsi *d = bridge_to_mcde_dsi(bridge); + unsigned long hs_freq, lp_freq; + u32 val; + int ret; + + /* Copy maximum clock frequencies */ + if (d->mdsi->lp_rate) + lp_freq = d->mdsi->lp_rate; + else + lp_freq = DSI_DEFAULT_LP_FREQ_HZ; + if (d->mdsi->hs_rate) + hs_freq = d->mdsi->hs_rate; + else + hs_freq = DSI_DEFAULT_HS_FREQ_HZ; + + /* Enable LP (Low Power, Energy Save, ES) and HS (High Speed) clocks */ + d->lp_freq = clk_round_rate(d->lp_clk, lp_freq); + ret = clk_set_rate(d->lp_clk, d->lp_freq); + if (ret) + dev_err(d->dev, "failed to set LP clock rate %lu Hz\n", + d->lp_freq); + + d->hs_freq = clk_round_rate(d->hs_clk, hs_freq); + ret = clk_set_rate(d->hs_clk, d->hs_freq); + if (ret) + dev_err(d->dev, "failed to set HS clock rate %lu Hz\n", + d->hs_freq); + + /* Start clocks */ + ret = clk_prepare_enable(d->lp_clk); + if (ret) + dev_err(d->dev, "failed to enable LP clock\n"); + else + dev_info(d->dev, "DSI LP clock rate %lu Hz\n", + d->lp_freq); + ret = clk_prepare_enable(d->hs_clk); + if (ret) + dev_err(d->dev, "failed to enable HS clock\n"); + else + dev_info(d->dev, "DSI HS clock rate %lu Hz\n", + d->hs_freq); + + /* Assert RESET through the PRCMU, active low */ + /* FIXME: which DSI block? */ + regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET, + PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0); + + usleep_range(100, 200); + + /* De-assert RESET again */ + regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET, + PRCM_DSI_SW_RESET_DSI0_SW_RESETN, + PRCM_DSI_SW_RESET_DSI0_SW_RESETN); + + /* Start up the hardware */ + mcde_dsi_start(d); + + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) { + /* Set up the video mode from the DRM mode */ + mcde_dsi_setup_video_mode(d, d->mode); + + /* Put IF1 into video mode */ + val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL); + val |= DSI_MCTL_MAIN_DATA_CTL_IF1_MODE; + writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL); + + /* Disable command mode on IF1 */ + val = readl(d->regs + DSI_CMD_MODE_CTL); + val &= ~DSI_CMD_MODE_CTL_IF1_LP_EN; + writel(val, d->regs + DSI_CMD_MODE_CTL); + + /* Enable some error interrupts */ + val = readl(d->regs + DSI_VID_MODE_STS_CTL); + val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_VSYNC; + val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_DATA; + writel(val, d->regs + DSI_VID_MODE_STS_CTL); + + /* Enable video mode */ + val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL); + val |= DSI_MCTL_MAIN_DATA_CTL_VID_EN; + writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL); + } else { + /* Command mode, clear IF1 ID */ + val = readl(d->regs + DSI_CMD_MODE_CTL); + /* + * If we enable low-power mode here + * the display updates become really slow. + */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM) + val |= DSI_CMD_MODE_CTL_IF1_LP_EN; + val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK; + writel(val, d->regs + DSI_CMD_MODE_CTL); + } + + dev_info(d->dev, "enabled MCDE DSI master\n"); +} + +static void mcde_dsi_bridge_mode_set(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adj) +{ + struct mcde_dsi *d = bridge_to_mcde_dsi(bridge); + + if (!d->mdsi) { + dev_err(d->dev, "no DSI device attached to encoder!\n"); + return; + } + + d->mode = mode; + + dev_info(d->dev, "set DSI master to %dx%d %u Hz %s mode\n", + mode->hdisplay, mode->vdisplay, mode->clock * 1000, + (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ? "VIDEO" : "CMD" + ); +} + +static void mcde_dsi_wait_for_command_mode_stop(struct mcde_dsi *d) +{ + u32 val; + int i; + + /* + * Wait until we get out of command mode + * CSM = Command State Machine + */ + i = 0; + val = DSI_CMD_MODE_STS_CSM_RUNNING; + while ((readl(d->regs + DSI_CMD_MODE_STS) & val) == val) { + /* Sleep for a millisecond */ + usleep_range(1000, 2000); + if (i++ == 100) { + dev_warn(d->dev, + "could not get out of command mode\n"); + return; + } + } +} + +static void mcde_dsi_wait_for_video_mode_stop(struct mcde_dsi *d) +{ + u32 val; + int i; + + /* Wait until we get out og video mode */ + i = 0; + val = DSI_VID_MODE_STS_VSG_RUNNING; + while ((readl(d->regs + DSI_VID_MODE_STS) & val) == val) { + /* Sleep for a millisecond */ + usleep_range(1000, 2000); + if (i++ == 100) { + dev_warn(d->dev, + "could not get out of video mode\n"); + return; + } + } +} + +/* + * Notice that this is called from inside the display controller + * and not from the bridge callbacks. + */ +void mcde_dsi_disable(struct drm_bridge *bridge) +{ + struct mcde_dsi *d = bridge_to_mcde_dsi(bridge); + u32 val; + + if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) { + /* Stop video mode */ + val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL); + val &= ~DSI_MCTL_MAIN_DATA_CTL_VID_EN; + writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL); + mcde_dsi_wait_for_video_mode_stop(d); + } else { + /* Stop command mode */ + mcde_dsi_wait_for_command_mode_stop(d); + } + + /* + * Stop clocks and terminate any DSI traffic here so the panel can + * send commands to shut down the display using DSI direct write until + * this point. + */ + + /* Disable all error interrupts */ + writel(0, d->regs + DSI_VID_MODE_STS_CTL); + clk_disable_unprepare(d->hs_clk); + clk_disable_unprepare(d->lp_clk); +} + +static int mcde_dsi_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct mcde_dsi *d = bridge_to_mcde_dsi(bridge); + struct drm_device *drm = bridge->dev; + int ret; + + if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) { + dev_err(d->dev, "we need atomic updates\n"); + return -ENOTSUPP; + } + + /* Attach the DSI bridge to the output (panel etc) bridge */ + ret = drm_bridge_attach(bridge->encoder, d->bridge_out, bridge, flags); + if (ret) { + dev_err(d->dev, "failed to attach the DSI bridge\n"); + return ret; + } + + return 0; +} + +static const struct drm_bridge_funcs mcde_dsi_bridge_funcs = { + .attach = mcde_dsi_bridge_attach, + .mode_set = mcde_dsi_bridge_mode_set, +}; + +static int mcde_dsi_bind(struct device *dev, struct device *master, + void *data) +{ + struct drm_device *drm = data; + struct mcde *mcde = to_mcde(drm); + struct mcde_dsi *d = dev_get_drvdata(dev); + struct device_node *child; + struct drm_panel *panel = NULL; + struct drm_bridge *bridge = NULL; + + if (!of_get_available_child_count(dev->of_node)) { + dev_info(dev, "unused DSI interface\n"); + d->unused = true; + return 0; + } + d->mcde = mcde; + /* If the display attached before binding, set this up */ + if (d->mdsi) + mcde_dsi_attach_to_mcde(d); + + /* Obtain the clocks */ + d->hs_clk = devm_clk_get(dev, "hs"); + if (IS_ERR(d->hs_clk)) { + dev_err(dev, "unable to get HS clock\n"); + return PTR_ERR(d->hs_clk); + } + + d->lp_clk = devm_clk_get(dev, "lp"); + if (IS_ERR(d->lp_clk)) { + dev_err(dev, "unable to get LP clock\n"); + return PTR_ERR(d->lp_clk); + } + + /* Look for a panel as a child to this node */ + for_each_available_child_of_node(dev->of_node, child) { + panel = of_drm_find_panel(child); + if (IS_ERR(panel)) { + dev_err(dev, "failed to find panel try bridge (%ld)\n", + PTR_ERR(panel)); + panel = NULL; + + bridge = of_drm_find_bridge(child); + if (!bridge) { + dev_err(dev, "failed to find bridge\n"); + of_node_put(child); + return -EINVAL; + } + } + } + if (panel) { + bridge = drm_panel_bridge_add_typed(panel, + DRM_MODE_CONNECTOR_DSI); + if (IS_ERR(bridge)) { + dev_err(dev, "error adding panel bridge\n"); + return PTR_ERR(bridge); + } + dev_info(dev, "connected to panel\n"); + d->panel = panel; + } else if (bridge) { + /* TODO: AV8100 HDMI encoder goes here for example */ + dev_info(dev, "connected to non-panel bridge (unsupported)\n"); + return -ENODEV; + } else { + dev_err(dev, "no panel or bridge\n"); + return -ENODEV; + } + + d->bridge_out = bridge; + + /* Create a bridge for this DSI channel */ + d->bridge.funcs = &mcde_dsi_bridge_funcs; + d->bridge.of_node = dev->of_node; + drm_bridge_add(&d->bridge); + + /* TODO: first come first serve, use a list */ + mcde->bridge = &d->bridge; + + dev_info(dev, "initialized MCDE DSI bridge\n"); + + return 0; +} + +static void mcde_dsi_unbind(struct device *dev, struct device *master, + void *data) +{ + struct mcde_dsi *d = dev_get_drvdata(dev); + + if (d->panel) + drm_panel_bridge_remove(d->bridge_out); + regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET, + PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0); +} + +static const struct component_ops mcde_dsi_component_ops = { + .bind = mcde_dsi_bind, + .unbind = mcde_dsi_unbind, +}; + +static int mcde_dsi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mcde_dsi *d; + struct mipi_dsi_host *host; + struct resource *res; + u32 dsi_id; + int ret; + + d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + d->dev = dev; + platform_set_drvdata(pdev, d); + + /* Get a handle on the PRCMU so we can do reset */ + d->prcmu = + syscon_regmap_lookup_by_compatible("stericsson,db8500-prcmu"); + if (IS_ERR(d->prcmu)) { + dev_err(dev, "no PRCMU regmap\n"); + return PTR_ERR(d->prcmu); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + d->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(d->regs)) { + dev_err(dev, "no DSI regs\n"); + return PTR_ERR(d->regs); + } + + dsi_id = readl(d->regs + DSI_ID_REG); + dev_info(dev, "HW revision 0x%08x\n", dsi_id); + + host = &d->dsi_host; + host->dev = dev; + host->ops = &mcde_dsi_host_ops; + ret = mipi_dsi_host_register(host); + if (ret < 0) { + dev_err(dev, "failed to register DSI host: %d\n", ret); + return ret; + } + dev_info(dev, "registered DSI host\n"); + + platform_set_drvdata(pdev, d); + return component_add(dev, &mcde_dsi_component_ops); +} + +static int mcde_dsi_remove(struct platform_device *pdev) +{ + struct mcde_dsi *d = platform_get_drvdata(pdev); + + component_del(&pdev->dev, &mcde_dsi_component_ops); + mipi_dsi_host_unregister(&d->dsi_host); + + return 0; +} + +static const struct of_device_id mcde_dsi_of_match[] = { + { + .compatible = "ste,mcde-dsi", + }, + {}, +}; + +struct platform_driver mcde_dsi_driver = { + .driver = { + .name = "mcde-dsi", + .of_match_table = of_match_ptr(mcde_dsi_of_match), + }, + .probe = mcde_dsi_probe, + .remove = mcde_dsi_remove, +}; |