Re: [PATCH] drm/mediatek/dp: fix mtk_dp_aux_transfer return value

From: CK Hu (胡俊光)
Date: Tue Apr 16 2024 - 22:50:11 EST


Hi, Wojciech:

On Tue, 2024-04-02 at 07:11 +0000, Wojciech Macek wrote:
>
> External email : Please do not click links or open attachments until
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> From: Wojciech Macek <wmacek@xxxxxxxxxxxx>
>
> In case there is no DP device attached to the port the
> transfer function should return IO error, similar to what
> other drivers do.
> In case EAGAIN is returned then any read from /dev/drm_dp_aux
> device ends up in an infinite loop as the upper layers
> constantly repeats the transfer request.

This patch looks good to me, but need fixes tag, please refer to [1] to
add fixes tag.

[1]
https://www.kernel.org/doc/html/v6.8/process/submitting-patches.html

Regards,
CK

>
> Signed-off-by: Wojciech Macek <wmacek@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_dp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index 0ba72102636a..536366956447 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -2104,7 +2104,7 @@ static ssize_t mtk_dp_aux_transfer(struct
> drm_dp_aux *mtk_aux,
>
> if (mtk_dp->bridge.type != DRM_MODE_CONNECTOR_eDP &&
> !mtk_dp->train_info.cable_plugged_in) {
> - ret = -EAGAIN;
> + ret = -EIO;
> goto err;
> }
>
> --
> 2.44.0.478.gd926399ef9-goog
>