diff options
| author | Niklas Schulze <me@jns.io> | 2019-07-27 15:07:13 +0300 |
|---|---|---|
| committer | Anatolij Gustschin <agust@denx.de> | 2019-07-29 01:32:59 +0300 |
| commit | 60a62acfb07afb0815f28abe6f49a9b906a7c3f4 (patch) | |
| tree | 84b3875ef9c441ffb7c8a5275423f68cf25a0aed /drivers/video/dw_hdmi.c | |
| parent | 233358c46a753438d9f0c26dc67dad3ddecca1e9 (diff) | |
| download | u-boot-60a62acfb07afb0815f28abe6f49a9b906a7c3f4.tar.xz | |
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>
Diffstat (limited to 'drivers/video/dw_hdmi.c')
| -rw-r--r-- | drivers/video/dw_hdmi.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/video/dw_hdmi.c b/drivers/video/dw_hdmi.c index 463436edf3..bf74d6adf2 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 +813,18 @@ 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); |