linux-kernel - Re: [PATCH v3 1/3] drm/display: split DSC helpers from DP helpers

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Date: Tue, 28 May 2024 11:14:49 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "Maarten
 Lankhorst" <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal
	<sumit.semwal@...aro.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        "Alex
 Deucher" <alexander.deucher@....com>,
        Christian König
	<christian.koenig@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi
	<rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tursulin@...ulin.net>,
        Rob Clark
	<robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul
	<sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Vinod Koul
	<vkoul@...nel.org>, Caleb Connolly <caleb@...nolly.tech>
CC: <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <amd-gfx@...ts.freedesktop.org>, <intel-gfx@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH v3 1/3] drm/display: split DSC helpers from DP helpers



On 5/21/2024 11:25 PM, Dmitry Baryshkov wrote:
> Currently the DRM DSC functions are selected by the
> DRM_DISPLAY_DP_HELPER Kconfig symbol. This is not optimal, since the DSI
> code (both panel and host drivers) end up selecting the seemingly
> irrelevant DP helpers. Split the DSC code to be guarded by the separate
> DRM_DISPLAY_DSC_HELPER Kconfig symbol.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Hi Dmitry,

LGTM

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

Thanks,

Jessica Zhang

> ---
>   drivers/gpu/drm/amd/amdgpu/Kconfig | 1 +
>   drivers/gpu/drm/display/Kconfig    | 6 ++++++
>   drivers/gpu/drm/display/Makefile   | 3 ++-
>   drivers/gpu/drm/i915/Kconfig       | 1 +
>   drivers/gpu/drm/msm/Kconfig        | 1 +
>   drivers/gpu/drm/panel/Kconfig      | 4 ++--
>   6 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
> index 22d88f8ef527..b69d5c4a5367 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Kconfig
> +++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
> @@ -6,6 +6,7 @@ config DRM_AMDGPU
>   	depends on !UML
>   	select FW_LOADER
>   	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_DSC_HELPER
>   	select DRM_DISPLAY_HDMI_HELPER
>   	select DRM_DISPLAY_HDCP_HELPER
>   	select DRM_DISPLAY_HELPER
> diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig
> index 864a6488bfdf..f524cf95dec3 100644
> --- a/drivers/gpu/drm/display/Kconfig
> +++ b/drivers/gpu/drm/display/Kconfig
> @@ -59,6 +59,12 @@ config DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG
>   
>   	  If in doubt, say "N".
>   
> +config DRM_DISPLAY_DSC_HELPER
> +	bool
> +	depends on DRM_DISPLAY_HELPER
> +	help
> +	  DRM display helpers for VESA DSC (used by DSI and DisplayPort).
> +
>   config DRM_DISPLAY_HDCP_HELPER
>   	bool
>   	depends on DRM_DISPLAY_HELPER
> diff --git a/drivers/gpu/drm/display/Makefile b/drivers/gpu/drm/display/Makefile
> index 17d2cc73ff56..2ec71e15c3cb 100644
> --- a/drivers/gpu/drm/display/Makefile
> +++ b/drivers/gpu/drm/display/Makefile
> @@ -6,7 +6,8 @@ drm_display_helper-y := drm_display_helper_mod.o
>   drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_HELPER) += \
>   	drm_dp_dual_mode_helper.o \
>   	drm_dp_helper.o \
> -	drm_dp_mst_topology.o \
> +	drm_dp_mst_topology.o
> +drm_display_helper-$(CONFIG_DRM_DISPLAY_DSC_HELPER) += \
>   	drm_dsc_helper.o
>   drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_TUNNEL) += \
>   	drm_dp_tunnel.o
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 5932024f8f95..117b84260b1c 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -11,6 +11,7 @@ config DRM_I915
>   	select SHMEM
>   	select TMPFS
>   	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_DSC_HELPER
>   	select DRM_DISPLAY_HDCP_HELPER
>   	select DRM_DISPLAY_HDMI_HELPER
>   	select DRM_DISPLAY_HELPER
> diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> index 1931ecf73e32..6dcd26180611 100644
> --- a/drivers/gpu/drm/msm/Kconfig
> +++ b/drivers/gpu/drm/msm/Kconfig
> @@ -111,6 +111,7 @@ config DRM_MSM_DSI
>   	depends on DRM_MSM
>   	select DRM_PANEL
>   	select DRM_MIPI_DSI
> +	select DRM_DISPLAY_DSC_HELPER
>   	default y
>   	help
>   	  Choose this option if you have a need for MIPI DSI connector
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 982324ef5a41..4a2f621433ef 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -547,7 +547,7 @@ config DRM_PANEL_RAYDIUM_RM692E5
>   	depends on OF
>   	depends on DRM_MIPI_DSI
>   	depends on BACKLIGHT_CLASS_DEVICE
> -	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_DSC_HELPER
>   	select DRM_DISPLAY_HELPER
>   	help
>   	  Say Y here if you want to enable support for Raydium RM692E5-based
> @@ -905,7 +905,7 @@ config DRM_PANEL_VISIONOX_R66451
>   	depends on OF
>   	depends on DRM_MIPI_DSI
>   	depends on BACKLIGHT_CLASS_DEVICE
> -	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_DSC_HELPER
>   	select DRM_DISPLAY_HELPER
>   	help
>   	  Say Y here if you want to enable support for Visionox
> 
> -- 
> 2.39.2
>