[PATCH v1] video: edid: print debug message on EDID read out error

[Ahmad Fatoum]

Hello Oleksij,

On 28.09.23 14:21, Oleksij Rempel wrote:
> From: Ahmad Fatoum <a.fatoum at pengutronix.de>
> 
> EDID readout errors happen often, e.g. because the HDMI port doesn't
> have a display connected. However, when a monitor is connected, but some
> other error occurs, barebox is silent. Add a debug message with an error
> code for this.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

This patch had been posted before and Marco had an objection to it:
https://lore.barebox.org/barebox/20221223090605.zis4mcft72crswfm@pengutronix.de/

> ---
>  drivers/video/edid.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/edid.c b/drivers/video/edid.c
> index d2757185f6..2baf6646d9 100644
> --- a/drivers/video/edid.c
> +++ b/drivers/video/edid.c
> @@ -852,20 +852,27 @@ edid_do_read_i2c(struct i2c_adapter *adapter, unsigned char *buf,
>  		ret = i2c_transfer(adapter, &msgs[3 - xfers], xfers);
>  	} while (ret != xfers && --retries);
>  
> -	return ret == xfers ? 0 : -1;
> +	if (ret == 0)
> +		ret = -EPROTO;
> +
> +	return ret == xfers ? 0 : ret;
>  }
>  
>  void *edid_read_i2c(struct i2c_adapter *adapter)
>  {
>  	u8 *block;
> +	int ret;
>  
>  	if (!IS_ENABLED(CONFIG_I2C))
>  		return NULL;
>  
>  	block = xmalloc(EDID_LENGTH);
>  
> -	if (edid_do_read_i2c(adapter, block, 0, EDID_LENGTH))
> +	ret = edid_do_read_i2c(adapter, block, 0, EDID_LENGTH);
> +	if (ret) {
> +		dev_dbg(&adapter->dev, "EDID readout failed: %pe\n", ERR_PTR(ret));
>  		goto out;
> +	}
>  
>  	return block;
>  out:

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