<pre>
Hi, Angelo:

On Mon, 2023-07-17 at 16:14 +0200, AngeloGioacchino Del Regno wrote:
>
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> Change logging from drm_{err,info}() to dev_{err,info}() in
> functions
> mtk_dp_aux_transfer() and mtk_dp_aux_do_transfer(): this will be
> essential to avoid getting NULL pointer kernel panics if any kind
> of error happens during AUX transfers happening before the bridge
> is attached.
>
> This may potentially start happening in a later commit implementing
> aux-bus support, as AUX transfers will be triggered from the panel
> driver (for EDID) before the mtk-dp bridge gets attached, and it's
> done in preparation for the same.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> Tested-by: Chen-Yu Tsai <wenst@chromium.org>
> ---
> drivers/gpu/drm/mediatek/mtk_dp.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index 77da0d002e9f..98f63d8230e4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -847,7 +847,7 @@ static int mtk_dp_aux_do_transfer(struct mtk_dp
> *mtk_dp, bool is_read, u8 cmd,
> u32 phy_status = mtk_dp_read(mtk_dp,
> MTK_DP_AUX_P0_3628) &
> AUX_RX_PHY_STATE_AUX_TX_P0_MASK;
> if (phy_status != AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE) {
> -drm_err(mtk_dp->drm_dev,
> +dev_err(mtk_dp->dev,
> "AUX Rx Aux hang, need SW reset\n");
> return -EIO;
> }
> @@ -2054,7 +2054,7 @@ static ssize_t mtk_dp_aux_transfer(struct
> drm_dp_aux *mtk_aux,
> is_read = true;
> break;
> default:
> -drm_err(mtk_aux->drm_dev, "invalid aux cmd = %d\n",
> +dev_err(mtk_dp->dev, "invalid aux cmd = %d\n",
> msg->request);
> ret = -EINVAL;
> goto err;
> @@ -2070,7 +2070,7 @@ static ssize_t mtk_dp_aux_transfer(struct
> drm_dp_aux *mtk_aux,
> to_access, &msg->reply);
>
> if (ret) {
> -drm_info(mtk_dp->drm_dev,
> +dev_info(mtk_dp->dev,
> "Failed to do AUX transfer: %d\n",
> ret);
> goto err;
> }
> --
> 2.40.1

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