linux-kernel - Re: [PATCH v2] drm/panel: samsung-s6d7aa0: use pointer for drm

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Date:   Wed, 24 May 2023 11:41:08 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Artur Weber <aweber.kernel@...il.com>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     thierry.reding@...il.com, Nikita Travkin <nikita@...n.ru>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        "kernelci . org bot" <bot@...nelci.org>
Subject: Re: [PATCH v2] drm/panel: samsung-s6d7aa0: use pointer for drm_mode
 in panel desc struct

On 24/05/2023 10:43, Artur Weber wrote:
> Fixes compilation issues with older GCC versions and Clang after
> changes introduced in commit 6810bb390282 ("drm/panel: Add Samsung
> S6D7AA0 panel controller driver"). Tested with GCC 13.1.1, GCC 6.4.0
> and Clang 16.0.3.
> 
> Fixes the following errors with Clang:
> 
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: error: initializer element is not a compile-time constant
>            .drm_mode = s6d7aa0_lsl080al02_mode,
>                        ^~~~~~~~~~~~~~~~~~~~~~~
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: error: initializer element is not a compile-time constant
>            .drm_mode = s6d7aa0_lsl080al03_mode,
>                        ^~~~~~~~~~~~~~~~~~~~~~~
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: error: initializer element is not a compile-time constant
>            .drm_mode = s6d7aa0_ltl101at01_mode,
>                        ^~~~~~~~~~~~~~~~~~~~~~~
>    3 errors generated.
> 
> Fixes the following errors with GCC:
> 
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: error: initializer element is not constant
>      .drm_mode = s6d7aa0_lsl080al02_mode,
>                  ^~~~~~~~~~~~~~~~~~~~~~~
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: note: (near initialization for 's6d7aa0_lsl080al02_desc.drm_mode')
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: error: initializer element is not constant
>      .drm_mode = s6d7aa0_lsl080al03_mode,
>                  ^~~~~~~~~~~~~~~~~~~~~~~
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: note: (near initialization for 's6d7aa0_lsl080al03_desc.drm_mode')
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: error: initializer element is not constant
>      .drm_mode = s6d7aa0_ltl101at01_mode,
>                  ^~~~~~~~~~~~~~~~~~~~~~~
>    drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: note: (near initialization for 's6d7aa0_ltl101at01_desc.drm_mode')
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Link: https://lore.kernel.org/lkml/20230523180212.GA1401867@dev-arch.thelio-3990X
> Reported-by: kernelci.org bot <bot@...nelci.org>
> Link: https://lore.kernel.org/llvm/646c6def.a70a0220.58c1a.903d@mx.google.com
> Fixes: 6810bb390282 ("drm/panel: Add Samsung S6D7AA0 panel controller driver")
> Signed-off-by: Artur Weber <aweber.kernel@...il.com>
> ---
> v2: expanded commit message
> ---
>   drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
> index f532aa018428..102e1fc7ee38 100644
> --- a/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
> @@ -37,7 +37,7 @@ struct s6d7aa0_panel_desc {
>   	unsigned int panel_type;
>   	int (*init_func)(struct s6d7aa0 *ctx);
>   	int (*off_func)(struct s6d7aa0 *ctx);
> -	const struct drm_display_mode drm_mode;
> +	const struct drm_display_mode *drm_mode;
>   	unsigned long mode_flags;
>   	u32 bus_flags;
>   	bool has_backlight;
> @@ -309,7 +309,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al02_desc = {
>   	.panel_type = S6D7AA0_PANEL_LSL080AL02,
>   	.init_func = s6d7aa0_lsl080al02_init,
>   	.off_func = s6d7aa0_lsl080al02_off,
> -	.drm_mode = s6d7aa0_lsl080al02_mode,
> +	.drm_mode = &s6d7aa0_lsl080al02_mode,
>   	.mode_flags = MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_NO_HFP,
>   	.bus_flags = DRM_BUS_FLAG_DE_HIGH,
>   
> @@ -412,7 +412,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al03_desc = {
>   	.panel_type = S6D7AA0_PANEL_LSL080AL03,
>   	.init_func = s6d7aa0_lsl080al03_init,
>   	.off_func = s6d7aa0_lsl080al03_off,
> -	.drm_mode = s6d7aa0_lsl080al03_mode,
> +	.drm_mode = &s6d7aa0_lsl080al03_mode,
>   	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
>   	.bus_flags = 0,
>   
> @@ -440,7 +440,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_ltl101at01_desc = {
>   	.panel_type = S6D7AA0_PANEL_LTL101AT01,
>   	.init_func = s6d7aa0_lsl080al03_init, /* Similar init to LSL080AL03 */
>   	.off_func = s6d7aa0_lsl080al03_off,
> -	.drm_mode = s6d7aa0_ltl101at01_mode,
> +	.drm_mode = &s6d7aa0_ltl101at01_mode,
>   	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
>   	.bus_flags = 0,
>   
> @@ -458,7 +458,7 @@ static int s6d7aa0_get_modes(struct drm_panel *panel,
>   	if (!ctx)
>   		return -EINVAL;
>   
> -	mode = drm_mode_duplicate(connector->dev, &ctx->desc->drm_mode);
> +	mode = drm_mode_duplicate(connector->dev, ctx->desc->drm_mode);
>   	if (!mode)
>   		return -ENOMEM;
>   
> 
> base-commit: 37cee4876a45a5c3da79a83d34ed4f3c68548aef

Acked-by: Neil Armstrong <neil.armstrong@...aro.org>