diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c new file mode 100644 index 000000000..503bd8db8 --- /dev/null +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c @@ -0,0 +1,450 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * Copyright 2020 NXP + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/media-bus-format.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_print.h> + +#define PC_CTRL_REG 0x0 +#define PC_COMBINE_ENABLE BIT(0) +#define PC_DISP_BYPASS(n) BIT(1 + 21 * (n)) +#define PC_DISP_HSYNC_POLARITY(n) BIT(2 + 11 * (n)) +#define PC_DISP_HSYNC_POLARITY_POS(n) DISP_HSYNC_POLARITY(n) +#define PC_DISP_VSYNC_POLARITY(n) BIT(3 + 11 * (n)) +#define PC_DISP_VSYNC_POLARITY_POS(n) DISP_VSYNC_POLARITY(n) +#define PC_DISP_DVALID_POLARITY(n) BIT(4 + 11 * (n)) +#define PC_DISP_DVALID_POLARITY_POS(n) DISP_DVALID_POLARITY(n) +#define PC_VSYNC_MASK_ENABLE BIT(5) +#define PC_SKIP_MODE BIT(6) +#define PC_SKIP_NUMBER_MASK GENMASK(12, 7) +#define PC_SKIP_NUMBER(n) FIELD_PREP(PC_SKIP_NUMBER_MASK, (n)) +#define PC_DISP0_PIX_DATA_FORMAT_MASK GENMASK(18, 16) +#define PC_DISP0_PIX_DATA_FORMAT(fmt) \ + FIELD_PREP(PC_DISP0_PIX_DATA_FORMAT_MASK, (fmt)) +#define PC_DISP1_PIX_DATA_FORMAT_MASK GENMASK(21, 19) +#define PC_DISP1_PIX_DATA_FORMAT(fmt) \ + FIELD_PREP(PC_DISP1_PIX_DATA_FORMAT_MASK, (fmt)) + +#define PC_SW_RESET_REG 0x20 +#define PC_SW_RESET_N BIT(0) +#define PC_DISP_SW_RESET_N(n) BIT(1 + (n)) +#define PC_FULL_RESET_N (PC_SW_RESET_N | \ + PC_DISP_SW_RESET_N(0) | \ + PC_DISP_SW_RESET_N(1)) + +#define PC_REG_SET 0x4 +#define PC_REG_CLR 0x8 + +#define DRIVER_NAME "imx8qxp-pixel-combiner" + +enum imx8qxp_pc_pix_data_format { + RGB, + YUV444, + YUV422, + SPLIT_RGB, +}; + +struct imx8qxp_pc_channel { + struct drm_bridge bridge; + struct drm_bridge *next_bridge; + struct imx8qxp_pc *pc; + unsigned int stream_id; + bool is_available; +}; + +struct imx8qxp_pc { + struct device *dev; + struct imx8qxp_pc_channel ch[2]; + struct clk *clk_apb; + void __iomem *base; +}; + +static inline u32 imx8qxp_pc_read(struct imx8qxp_pc *pc, unsigned int offset) +{ + return readl(pc->base + offset); +} + +static inline void +imx8qxp_pc_write(struct imx8qxp_pc *pc, unsigned int offset, u32 value) +{ + writel(value, pc->base + offset); +} + +static inline void +imx8qxp_pc_write_set(struct imx8qxp_pc *pc, unsigned int offset, u32 value) +{ + imx8qxp_pc_write(pc, offset + PC_REG_SET, value); +} + +static inline void +imx8qxp_pc_write_clr(struct imx8qxp_pc *pc, unsigned int offset, u32 value) +{ + imx8qxp_pc_write(pc, offset + PC_REG_CLR, value); +} + +static enum drm_mode_status +imx8qxp_pc_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_info *info, + const struct drm_display_mode *mode) +{ + if (mode->hdisplay > 2560) + return MODE_BAD_HVALUE; + + return MODE_OK; +} + +static int imx8qxp_pc_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct imx8qxp_pc_channel *ch = bridge->driver_private; + struct imx8qxp_pc *pc = ch->pc; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + DRM_DEV_ERROR(pc->dev, + "do not support creating a drm_connector\n"); + return -EINVAL; + } + + if (!bridge->encoder) { + DRM_DEV_ERROR(pc->dev, "missing encoder\n"); + return -ENODEV; + } + + return drm_bridge_attach(bridge->encoder, + ch->next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +static void +imx8qxp_pc_bridge_mode_set(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adjusted_mode) +{ + struct imx8qxp_pc_channel *ch = bridge->driver_private; + struct imx8qxp_pc *pc = ch->pc; + u32 val; + int ret; + + ret = pm_runtime_get_sync(pc->dev); + if (ret < 0) + DRM_DEV_ERROR(pc->dev, + "failed to get runtime PM sync: %d\n", ret); + + ret = clk_prepare_enable(pc->clk_apb); + if (ret) + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", + __func__, ret); + + /* HSYNC to pixel link is active low. */ + imx8qxp_pc_write_clr(pc, PC_CTRL_REG, + PC_DISP_HSYNC_POLARITY(ch->stream_id)); + + /* VSYNC to pixel link is active low. */ + imx8qxp_pc_write_clr(pc, PC_CTRL_REG, + PC_DISP_VSYNC_POLARITY(ch->stream_id)); + + /* Data enable to pixel link is active high. */ + imx8qxp_pc_write_set(pc, PC_CTRL_REG, + PC_DISP_DVALID_POLARITY(ch->stream_id)); + + /* Mask the first frame output which may be incomplete. */ + imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_VSYNC_MASK_ENABLE); + + /* Only support RGB currently. */ + val = imx8qxp_pc_read(pc, PC_CTRL_REG); + if (ch->stream_id == 0) { + val &= ~PC_DISP0_PIX_DATA_FORMAT_MASK; + val |= PC_DISP0_PIX_DATA_FORMAT(RGB); + } else { + val &= ~PC_DISP1_PIX_DATA_FORMAT_MASK; + val |= PC_DISP1_PIX_DATA_FORMAT(RGB); + } + imx8qxp_pc_write(pc, PC_CTRL_REG, val); + + /* Only support bypass mode currently. */ + imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_DISP_BYPASS(ch->stream_id)); + + clk_disable_unprepare(pc->clk_apb); +} + +static void +imx8qxp_pc_bridge_atomic_disable(struct drm_bridge *bridge, + struct drm_bridge_state *old_bridge_state) +{ + struct imx8qxp_pc_channel *ch = bridge->driver_private; + struct imx8qxp_pc *pc = ch->pc; + int ret; + + ret = pm_runtime_put(pc->dev); + if (ret < 0) + DRM_DEV_ERROR(pc->dev, "failed to put runtime PM: %d\n", ret); +} + +static const u32 imx8qxp_pc_bus_output_fmts[] = { + MEDIA_BUS_FMT_RGB888_1X36_CPADLO, + MEDIA_BUS_FMT_RGB666_1X36_CPADLO, +}; + +static bool imx8qxp_pc_bus_output_fmt_supported(u32 fmt) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(imx8qxp_pc_bus_output_fmts); i++) { + if (imx8qxp_pc_bus_output_fmts[i] == fmt) + return true; + } + + return false; +} + +static u32 * +imx8qxp_pc_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + u32 output_fmt, + unsigned int *num_input_fmts) +{ + u32 *input_fmts; + + if (!imx8qxp_pc_bus_output_fmt_supported(output_fmt)) + return NULL; + + *num_input_fmts = 1; + + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); + if (!input_fmts) + return NULL; + + switch (output_fmt) { + case MEDIA_BUS_FMT_RGB888_1X36_CPADLO: + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X30_CPADLO; + break; + case MEDIA_BUS_FMT_RGB666_1X36_CPADLO: + input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X30_CPADLO; + break; + default: + kfree(input_fmts); + input_fmts = NULL; + break; + } + + return input_fmts; +} + +static u32 * +imx8qxp_pc_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + unsigned int *num_output_fmts) +{ + *num_output_fmts = ARRAY_SIZE(imx8qxp_pc_bus_output_fmts); + return kmemdup(imx8qxp_pc_bus_output_fmts, + sizeof(imx8qxp_pc_bus_output_fmts), GFP_KERNEL); +} + +static const struct drm_bridge_funcs imx8qxp_pc_bridge_funcs = { + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_reset = drm_atomic_helper_bridge_reset, + .mode_valid = imx8qxp_pc_bridge_mode_valid, + .attach = imx8qxp_pc_bridge_attach, + .mode_set = imx8qxp_pc_bridge_mode_set, + .atomic_disable = imx8qxp_pc_bridge_atomic_disable, + .atomic_get_input_bus_fmts = + imx8qxp_pc_bridge_atomic_get_input_bus_fmts, + .atomic_get_output_bus_fmts = + imx8qxp_pc_bridge_atomic_get_output_bus_fmts, +}; + +static int imx8qxp_pc_bridge_probe(struct platform_device *pdev) +{ + struct imx8qxp_pc *pc; + struct imx8qxp_pc_channel *ch; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *child, *remote; + u32 i; + int ret; + + pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); + if (!pc) + return -ENOMEM; + + pc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(pc->base)) + return PTR_ERR(pc->base); + + pc->dev = dev; + + pc->clk_apb = devm_clk_get(dev, "apb"); + if (IS_ERR(pc->clk_apb)) { + ret = PTR_ERR(pc->clk_apb); + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "failed to get apb clock: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, pc); + pm_runtime_enable(dev); + + for_each_available_child_of_node(np, child) { + ret = of_property_read_u32(child, "reg", &i); + if (ret || i > 1) { + ret = -EINVAL; + DRM_DEV_ERROR(dev, + "invalid channel(%u) node address\n", i); + goto free_child; + } + + ch = &pc->ch[i]; + ch->pc = pc; + ch->stream_id = i; + + remote = of_graph_get_remote_node(child, 1, 0); + if (!remote) { + ret = -ENODEV; + DRM_DEV_ERROR(dev, + "channel%u failed to get port1's remote node: %d\n", + i, ret); + goto free_child; + } + + ch->next_bridge = of_drm_find_bridge(remote); + if (!ch->next_bridge) { + of_node_put(remote); + ret = -EPROBE_DEFER; + DRM_DEV_DEBUG_DRIVER(dev, + "channel%u failed to find next bridge: %d\n", + i, ret); + goto free_child; + } + + of_node_put(remote); + + ch->bridge.driver_private = ch; + ch->bridge.funcs = &imx8qxp_pc_bridge_funcs; + ch->bridge.of_node = child; + ch->is_available = true; + + drm_bridge_add(&ch->bridge); + } + + return 0; + +free_child: + of_node_put(child); + + if (i == 1 && pc->ch[0].next_bridge) + drm_bridge_remove(&pc->ch[0].bridge); + + pm_runtime_disable(dev); + return ret; +} + +static int imx8qxp_pc_bridge_remove(struct platform_device *pdev) +{ + struct imx8qxp_pc *pc = platform_get_drvdata(pdev); + struct imx8qxp_pc_channel *ch; + int i; + + for (i = 0; i < 2; i++) { + ch = &pc->ch[i]; + + if (!ch->is_available) + continue; + + drm_bridge_remove(&ch->bridge); + ch->is_available = false; + } + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static int __maybe_unused imx8qxp_pc_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct imx8qxp_pc *pc = platform_get_drvdata(pdev); + int ret; + + ret = clk_prepare_enable(pc->clk_apb); + if (ret) + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", + __func__, ret); + + /* Disable pixel combiner by full reset. */ + imx8qxp_pc_write_clr(pc, PC_SW_RESET_REG, PC_FULL_RESET_N); + + clk_disable_unprepare(pc->clk_apb); + + /* Ensure the reset takes effect. */ + usleep_range(10, 20); + + return ret; +} + +static int __maybe_unused imx8qxp_pc_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct imx8qxp_pc *pc = platform_get_drvdata(pdev); + int ret; + + ret = clk_prepare_enable(pc->clk_apb); + if (ret) { + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", + __func__, ret); + return ret; + } + + /* out of reset */ + imx8qxp_pc_write_set(pc, PC_SW_RESET_REG, PC_FULL_RESET_N); + + clk_disable_unprepare(pc->clk_apb); + + return ret; +} + +static const struct dev_pm_ops imx8qxp_pc_pm_ops = { + SET_RUNTIME_PM_OPS(imx8qxp_pc_runtime_suspend, + imx8qxp_pc_runtime_resume, NULL) +}; + +static const struct of_device_id imx8qxp_pc_dt_ids[] = { + { .compatible = "fsl,imx8qm-pixel-combiner", }, + { .compatible = "fsl,imx8qxp-pixel-combiner", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx8qxp_pc_dt_ids); + +static struct platform_driver imx8qxp_pc_bridge_driver = { + .probe = imx8qxp_pc_bridge_probe, + .remove = imx8qxp_pc_bridge_remove, + .driver = { + .pm = &imx8qxp_pc_pm_ops, + .name = DRIVER_NAME, + .of_match_table = imx8qxp_pc_dt_ids, + }, +}; +module_platform_driver(imx8qxp_pc_bridge_driver); + +MODULE_DESCRIPTION("i.MX8QM/QXP pixel combiner bridge driver"); +MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); |