linux-kernel - Re: [PATCH v2 2/4] Revert "drm/panel-edp: Add SDC ATNA45AF01"

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Message-ID: <7daa3c0d-cecf-4f50-be32-ae116b920db0@linaro.org>
Date: Mon, 15 Jul 2024 14:42:12 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Stephan Gerhold <stephan.gerhold@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Douglas Anderson <dianders@...omium.org>,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 Abel Vesa <abel.vesa@...aro.org>, Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v2 2/4] Revert "drm/panel-edp: Add SDC ATNA45AF01"

Hi,

On 15/07/2024 14:15, Stephan Gerhold wrote:
> This reverts commit 8ebb1fc2e69ab8b89a425e402c7bd85e053b7b01.
> 
> The panel should be handled through the samsung-atna33xc20 driver for
> correct power up timings. Otherwise the backlight does not work correctly.
> 
> We have existing users of this panel through the generic "edp-panel"
> compatible (e.g. the Qualcomm X1E80100 CRD), but the screen works only
> partially in that configuration: It works after boot but once the screen
> gets disabled it does not turn on again until after reboot. It behaves the
> same way with the default "conservative" timings, so we might as well drop
> the configuration from the panel-edp driver. That way, users with old DTBs
> will get a warning and can move to the new driver.
> 
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
> ---
>   drivers/gpu/drm/panel/panel-edp.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
> index 3a574a9b46e7..d2d682385e89 100644
> --- a/drivers/gpu/drm/panel/panel-edp.c
> +++ b/drivers/gpu/drm/panel/panel-edp.c
> @@ -1960,8 +1960,6 @@ static const struct edp_panel_entry edp_panels[] = {
>   	EDP_PANEL_ENTRY('L', 'G', 'D', 0x05af, &delay_200_500_e200_d200, "Unknown"),
>   	EDP_PANEL_ENTRY('L', 'G', 'D', 0x05f1, &delay_200_500_e200_d200, "Unknown"),
>   
> -	EDP_PANEL_ENTRY('S', 'D', 'C', 0x416d, &delay_100_500_e200, "ATNA45AF01"),
> -
>   	EDP_PANEL_ENTRY('S', 'H', 'P', 0x1511, &delay_200_500_e50, "LQ140M1JW48"),
>   	EDP_PANEL_ENTRY('S', 'H', 'P', 0x1523, &delay_80_500_e50, "LQ140M1JW46"),
>   	EDP_PANEL_ENTRY('S', 'H', 'P', 0x153a, &delay_200_500_e50, "LQ140T1JH01"),
> 

How will we handle current/old crd DT with new kernels ?

Same question for patch 3, thie serie introduces a bindings that won't be valid
if we backport patch 3. I don't think patch should be backported, and this patch
should be dropped.

Neil