linux-kernel - Re: [PATCH v3 2/2] drivers: gpu: drm: remove support for sofef00 driver on s6e3fc2x01 panel

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Date:   Sat, 5 Nov 2022 22:21:20 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Nia Espera <a5b6@...eup.net>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, phone-devel@...r.kernel.org,
        Caleb Connolly <caleb@...nolly.tech>
Subject: Re: [PATCH v3 2/2] drivers: gpu: drm: remove support for sofef00
 driver on s6e3fc2x01 panel

On Sat, Oct 08, 2022 at 03:12:03PM +0200, Nia Espera wrote:

Same comment as on patch 1 regarding $subject prefix.

> Removes functionality from sofef00 panel driver which allowed it to
> drive the s6e3fc2x01 panel
> 

This states what the removed code relates to, but not why you're doing
it.

> Signed-off-by: Nia Espera <a5b6@...eup.net>
> Reviewed-by: Caleb Connolly <caleb@...nolly.tech>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  6 +++---
>  drivers/gpu/drm/panel/panel-samsung-sofef00.c | 18 ------------------
>  2 files changed, 3 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 0dd5e1ec5644..1addbd7e4790 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -547,16 +547,16 @@ config DRM_PANEL_SAMSUNG_S6E8AA0
>  	select VIDEOMODE_HELPERS
>  
>  config DRM_PANEL_SAMSUNG_SOFEF00
> -	tristate "Samsung sofef00/s6e3fc2x01 OnePlus 6/6T DSI cmd mode panels"
> +	tristate "Samsung sofef00 OnePlus 6 DSI cmd mode panel"
>  	depends on OF
>  	depends on DRM_MIPI_DSI
>  	depends on BACKLIGHT_CLASS_DEVICE
>  	select VIDEOMODE_HELPERS
>  	help
>  	  Say Y or M here if you want to enable support for the Samsung AMOLED
> -	  command mode panels found in the OnePlus 6/6T smartphones.
> +	  command mode panel found in the OnePlus 6 smartphone.
>  
> -	  The panels are 2280x1080@...z and 2340x1080@...z respectively
> +	  The panel is 2280x1080@...z
>  
>  config DRM_PANEL_SAMSUNG_S6E3FC2X01
>  	tristate "Samsung s6e3fc2x01 OnePlus 6T DSI cmd mode panel"
> diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
> index bd02af81a4fe..68e58b9b8c5c 100644
> --- a/drivers/gpu/drm/panel/panel-samsung-sofef00.c
> +++ b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
> @@ -181,20 +181,6 @@ static const struct drm_display_mode enchilada_panel_mode = {
>  	.height_mm = 145,
>  };
>  
> -static const struct drm_display_mode fajita_panel_mode = {
> -	.clock = (1080 + 72 + 16 + 36) * (2340 + 32 + 4 + 18) * 60 / 1000,
> -	.hdisplay = 1080,
> -	.hsync_start = 1080 + 72,
> -	.hsync_end = 1080 + 72 + 16,
> -	.htotal = 1080 + 72 + 16 + 36,
> -	.vdisplay = 2340,
> -	.vsync_start = 2340 + 32,
> -	.vsync_end = 2340 + 32 + 4,
> -	.vtotal = 2340 + 32 + 4 + 18,
> -	.width_mm = 68,
> -	.height_mm = 145,
> -};
> -
>  static int sofef00_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector)
>  {
>  	struct drm_display_mode *mode;
> @@ -327,10 +313,6 @@ static const struct of_device_id sofef00_panel_of_match[] = {
>  		.compatible = "samsung,sofef00",
>  		.data = &enchilada_panel_mode,
>  	},
> -	{ // OnePlus 6T / fajita
> -		.compatible = "samsung,s6e3fc2x01",

But keeping this in a separate patch means that for a while we have two
implementations of this compatible. I think it would be prettier to
squash the two patches - and clarify in the commit message why you're
creating an additional driver.

Regards,
Bjorn

> -		.data = &fajita_panel_mode,
> -	},
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sofef00_panel_of_match);
> -- 
> 2.38.0
>