linux-kernel - Re: [PATCH v5 21/36] drm/bridge: analogix_dp: Fix timeout of video streamclk config

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Date:   Wed, 14 Mar 2018 12:03:35 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        inki.dae@...sung.com, thierry.reding@...il.com, hjc@...k-chips.com,
        seanpaul@...omium.org, airlied@...ux.ie, tfiga@...omium.org,
        heiko@...ech.de
Cc:     dri-devel@...ts.freedesktop.org, dianders@...omium.org,
        a.hajda@...sung.com, ykk@...k-chips.com, kernel@...labora.com,
        m.szyprowski@...sung.com, linux-samsung-soc@...r.kernel.org,
        jy0922.shim@...sung.com, rydberg@...math.org, krzk@...nel.org,
        linux-rockchip@...ts.infradead.org, kgene@...nel.org,
        linux-input@...r.kernel.org, orjan.eide@....com,
        wxt@...k-chips.com, jeffy.chen@...k-chips.com,
        linux-arm-kernel@...ts.infradead.org, mark.yao@...k-chips.com,
        wzz@...k-chips.com, hl@...k-chips.com, jingoohan1@...il.com,
        sw0312.kim@...sung.com, linux-kernel@...r.kernel.org,
        kyungmin.park@...sung.com, Laurent.pinchart@...asonboard.com,
        kuankuan.y@...il.com, hshi@...omium.org
Subject: Re: [PATCH v5 21/36] drm/bridge: analogix_dp: Fix timeout of video
 streamclk config



On Saturday 10 March 2018 03:53 AM, Enric Balletbo i Serra wrote:
> From: zain wang <wzz@...k-chips.com>
> 
> The STRM_VALID bit in register ANALOGIX_DP_SYS_CTL_3 may be unstable,
> so we may hit the error log "Timeout of video streamclk ok" since
> checked this unstable bit.
> In fact, we can go continue and the streamclk is ok if we wait enough time,
> it does no effect on display.
> Let's change this error to warn.

Reviewed-by: Archit Taneja <architt@...eaurora.org>

Thanks,
Archit

> 
> Cc: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: zain wang <wzz@...k-chips.com>
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> 
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 1f1cb624414d..d76e1652b1fd 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -921,8 +921,9 @@ static int analogix_dp_config_video(struct analogix_dp_device *dp)
>   			done_count = 0;
>   		}
>   		if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
> -			dev_err(dp->dev, "Timeout of video streamclk ok\n");
> -			return -ETIMEDOUT;
> +			dev_warn(dp->dev,
> +				 "Ignoring timeout of video streamclk ok\n");
> +			break;
>   		}
>   
>   		usleep_range(1000, 1001);
>