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video: dw_hdmi: Add support for ddc-i2c-bus property
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>
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5 changed files with 23 additions and 0 deletions
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@ -8,6 +8,7 @@
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#include <common.h>
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#include <fdtdec.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include <media_bus_format.h>
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#include "dw_hdmi.h"
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@ -812,6 +813,18 @@ static int hdmi_read_edid(struct dw_hdmi *hdmi, int block, u8 *buff)
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u32 trytime = 5;
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u32 n;
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if (CONFIG_IS_ENABLED(DM_I2C) && hdmi->ddc_bus) {
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struct udevice *chip;
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edid_read_err = i2c_get_chip(hdmi->ddc_bus,
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HDMI_I2CM_SLAVE_DDC_ADDR,
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1, &chip);
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if (edid_read_err)
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return edid_read_err;
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return dm_i2c_read(chip, shift, buff, HDMI_EDID_BLOCK_SIZE);
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}
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/* set ddc i2c clk which devided from ddc_clk to 100khz */
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hdmi_write(hdmi, hdmi->i2c_clk_high, HDMI_I2CM_SS_SCL_HCNT_0_ADDR);
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hdmi_write(hdmi, hdmi->i2c_clk_low, HDMI_I2CM_SS_SCL_LCNT_0_ADDR);
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@ -375,6 +375,9 @@ static int meson_dw_hdmi_probe(struct udevice *dev)
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}
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#endif
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uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus",
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&priv->hdmi.ddc_bus);
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ret = reset_get_bulk(dev, &resets);
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if (ret)
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return ret;
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@ -93,6 +93,9 @@ int rk_hdmi_ofdata_to_platdata(struct udevice *dev)
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priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
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uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus",
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&hdmi->ddc_bus);
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return 0;
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}
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@ -373,6 +373,9 @@ static int sunxi_dw_hdmi_probe(struct udevice *dev)
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priv->hdmi.phy_set = sunxi_dw_hdmi_phy_cfg;
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priv->mux = uc_plat->source_id;
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uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus",
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&priv->hdmi.ddc_bus);
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dw_hdmi_init(&priv->hdmi);
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return 0;
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@ -542,6 +542,7 @@ struct dw_hdmi {
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u8 i2c_clk_low;
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u8 reg_io_width;
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struct hdmi_data_info hdmi_data;
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struct udevice *ddc_bus;
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int (*phy_set)(struct dw_hdmi *hdmi, uint mpixelclock);
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void (*write_reg)(struct dw_hdmi *hdmi, u8 val, int offset);
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