diff options
Diffstat (limited to 'drivers/gpu/drm/omapdrm/dss/hdmi_phy.c')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/dss/hdmi_phy.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi_phy.c b/drivers/gpu/drm/omapdrm/dss/hdmi_phy.c new file mode 100644 index 000000000..060e8f76f --- /dev/null +++ b/drivers/gpu/drm/omapdrm/dss/hdmi_phy.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HDMI PHY + * + * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/ + */ + +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/seq_file.h> + +#include "omapdss.h" +#include "dss.h" +#include "hdmi.h" + +void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s) +{ +#define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\ + hdmi_read_reg(phy->base, r)) + + DUMPPHY(HDMI_TXPHY_TX_CTRL); + DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL); + DUMPPHY(HDMI_TXPHY_POWER_CTRL); + DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL); + if (phy->features->bist_ctrl) + DUMPPHY(HDMI_TXPHY_BIST_CONTROL); +} + +int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes) +{ + int i; + + for (i = 0; i < 8; i += 2) { + u8 lane, pol; + int dx, dy; + + dx = lanes[i]; + dy = lanes[i + 1]; + + if (dx < 0 || dx >= 8) + return -EINVAL; + + if (dy < 0 || dy >= 8) + return -EINVAL; + + if (dx & 1) { + if (dy != dx - 1) + return -EINVAL; + pol = 1; + } else { + if (dy != dx + 1) + return -EINVAL; + pol = 0; + } + + lane = dx / 2; + + phy->lane_function[lane] = i / 2; + phy->lane_polarity[lane] = pol; + } + + return 0; +} + +static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy) +{ + static const u16 pad_cfg_list[] = { + 0x0123, + 0x0132, + 0x0312, + 0x0321, + 0x0231, + 0x0213, + 0x1023, + 0x1032, + 0x3012, + 0x3021, + 0x2031, + 0x2013, + 0x1203, + 0x1302, + 0x3102, + 0x3201, + 0x2301, + 0x2103, + 0x1230, + 0x1320, + 0x3120, + 0x3210, + 0x2310, + 0x2130, + }; + + u16 lane_cfg = 0; + int i; + unsigned int lane_cfg_val; + u16 pol_val = 0; + + for (i = 0; i < 4; ++i) + lane_cfg |= phy->lane_function[i] << ((3 - i) * 4); + + pol_val |= phy->lane_polarity[0] << 0; + pol_val |= phy->lane_polarity[1] << 3; + pol_val |= phy->lane_polarity[2] << 2; + pol_val |= phy->lane_polarity[3] << 1; + + for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i) + if (pad_cfg_list[i] == lane_cfg) + break; + + if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list))) + i = 0; + + lane_cfg_val = i; + + REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22); + REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27); +} + +int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk, + unsigned long lfbitclk) +{ + u8 freqout; + + /* + * Read address 0 in order to get the SCP reset done completed + * Dummy access performed to make sure reset is done + */ + hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL); + + /* + * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the + * HDMI_PHYPWRCMD_LDOON command. + */ + if (phy->features->bist_ctrl) + REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11); + + /* + * If the hfbitclk != lfbitclk, it means the lfbitclk was configured + * to be used for TMDS. + */ + if (hfbitclk != lfbitclk) + freqout = 0; + else if (hfbitclk / 10 < phy->features->max_phy) + freqout = 1; + else + freqout = 2; + + /* + * Write to phy address 0 to configure the clock + * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field + */ + REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30); + + /* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */ + hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000); + + /* Setup max LDO voltage */ + if (phy->features->ldo_voltage) + REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0); + + hdmi_phy_configure_lanes(phy); + + return 0; +} + +static const struct hdmi_phy_features omap44xx_phy_feats = { + .bist_ctrl = false, + .ldo_voltage = true, + .max_phy = 185675000, +}; + +static const struct hdmi_phy_features omap54xx_phy_feats = { + .bist_ctrl = true, + .ldo_voltage = false, + .max_phy = 186000000, +}; + +int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy, + unsigned int version) +{ + if (version == 4) + phy->features = &omap44xx_phy_feats; + else + phy->features = &omap54xx_phy_feats; + + phy->base = devm_platform_ioremap_resource_byname(pdev, "phy"); + if (IS_ERR(phy->base)) + return PTR_ERR(phy->base); + + return 0; +} |