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video: dw_hdmi: Add support for ddc-i2c-bus property

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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>
This commit is contained in:
Niklas Schulze 2019-07-27 12:07:13 +00:00 committed by Anatolij Gustschin
parent 233358c46a
commit 60a62acfb0
5 changed files with 23 additions and 0 deletions
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13
drivers/video/dw_hdmi.c
View File

@ -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 +813,18 @@ static int hdmi_read_edid(struct dw_hdmi *hdmi, int block, u8 *buff)
u32 trytime = 5;
u32 n;
if (CONFIG_IS_ENABLED(DM_I2C) && hdmi->ddc_bus) {
struct udevice *chip;
edid_read_err = i2c_get_chip(hdmi->ddc_bus,
HDMI_I2CM_SLAVE_DDC_ADDR,
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);

3
drivers/video/meson/meson_dw_hdmi.c
View File

@ -375,6 +375,9 @@ 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;

3
drivers/video/rockchip/rk_hdmi.c
View File

@ -93,6 +93,9 @@ 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;
}

3
drivers/video/sunxi/sunxi_dw_hdmi.c
View File

@ -373,6 +373,9 @@ 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;

1
include/dw_hdmi.h
View File

@ -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);