Add support for the ddc-i2c-bus device tree property which allows for using an external i2c master for reading the display's EDID.

Signed-off-by: Niklas Schulze me@jns.io --- drivers/video/dw_hdmi.c | 10 ++++++++++ drivers/video/meson/meson_dw_hdmi.c | 2 ++ drivers/video/rockchip/rk_hdmi.c | 2 ++ drivers/video/sunxi/sunxi_dw_hdmi.c | 2 ++ include/dw_hdmi.h | 1 + 5 files changed, 17 insertions(+)

diff --git a/drivers/video/dw_hdmi.c b/drivers/video/dw_hdmi.c index 463436edf3..f64a484d7c 100644 --- a/drivers/video/dw_hdmi.c +++ b/drivers/video/dw_hdmi.c @@ -8,6 +8,7 @@ #include <common.h> #include <fdtdec.h> #include <asm/io.h> +#include <i2c.h> #include <media_bus_format.h> #include "dw_hdmi.h"

@@ -812,6 +813,15 @@ static int hdmi_read_edid(struct dw_hdmi *hdmi, int block, u8 *buff) u32 trytime = 5; u32 n;

+ struct udevice *chip; + if (hdmi->ddc_bus) { + edid_read_err = i2c_get_chip(hdmi->ddc_bus, 0x50, 1, &chip); + if (edid_read_err) + return edid_read_err; + + return dm_i2c_read(chip, shift, buff, HDMI_EDID_BLOCK_SIZE); + } + /* set ddc i2c clk which devided from ddc_clk to 100khz */ hdmi_write(hdmi, hdmi->i2c_clk_high, HDMI_I2CM_SS_SCL_HCNT_0_ADDR); hdmi_write(hdmi, hdmi->i2c_clk_low, HDMI_I2CM_SS_SCL_LCNT_0_ADDR); diff --git a/drivers/video/meson/meson_dw_hdmi.c b/drivers/video/meson/meson_dw_hdmi.c index 483c93f6b6..930bc64bf6 100644 --- a/drivers/video/meson/meson_dw_hdmi.c +++ b/drivers/video/meson/meson_dw_hdmi.c @@ -375,6 +375,8 @@ static int meson_dw_hdmi_probe(struct udevice *dev) } #endif

+ uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus", &priv->hdmi.ddc_bus); + ret = reset_get_bulk(dev, &resets); if (ret) return ret; diff --git a/drivers/video/rockchip/rk_hdmi.c b/drivers/video/rockchip/rk_hdmi.c index 51931ceefa..b4250c8ee9 100644 --- a/drivers/video/rockchip/rk_hdmi.c +++ b/drivers/video/rockchip/rk_hdmi.c @@ -93,6 +93,8 @@ int rk_hdmi_ofdata_to_platdata(struct udevice *dev)

priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);

+ uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus", &hdmi->ddc_bus); + return 0; }

diff --git a/drivers/video/sunxi/sunxi_dw_hdmi.c b/drivers/video/sunxi/sunxi_dw_hdmi.c index 6fe1aa7ee4..bff73aa4e5 100644 --- a/drivers/video/sunxi/sunxi_dw_hdmi.c +++ b/drivers/video/sunxi/sunxi_dw_hdmi.c @@ -373,6 +373,8 @@ static int sunxi_dw_hdmi_probe(struct udevice *dev) priv->hdmi.phy_set = sunxi_dw_hdmi_phy_cfg; priv->mux = uc_plat->source_id;

+ uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus", &priv->hdmi.ddc_bus); + dw_hdmi_init(&priv->hdmi);

return 0; diff --git a/include/dw_hdmi.h b/include/dw_hdmi.h index 90fb64bc99..8acae3839f 100644 --- a/include/dw_hdmi.h +++ b/include/dw_hdmi.h @@ -542,6 +542,7 @@ struct dw_hdmi { u8 i2c_clk_low; u8 reg_io_width; struct hdmi_data_info hdmi_data; + struct udevice *ddc_bus;

int (*phy_set)(struct dw_hdmi *hdmi, uint mpixelclock); void (*write_reg)(struct dw_hdmi *hdmi, u8 val, int offset);