linux-kernel - Re: [PATCH 05/45] drm/msm/dp: add a helper to read mst caps for dp

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Message-ID: <aksnudxy2oyojjzwm73i4mulftcxccdsnddcdamypmscn6skpq@ijtp7x76m3pt>
Date: Fri, 6 Dec 2024 10:52:12 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Stephen Boyd <swboyd@...omium.org>, 
	Chandan Uddaraju <chandanu@...eaurora.org>, Guenter Roeck <groeck@...omium.org>, 
	Kuogee Hsieh <quic_khsieh@...cinc.com>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Vara Reddy <quic_varar@...cinc.com>, Rob Clark <robdclark@...omium.org>, 
	Tanmay Shah <tanmay@...eaurora.org>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 05/45] drm/msm/dp: add a helper to read mst caps for
 dp_panel

On Thu, Dec 05, 2024 at 08:31:36PM -0800, Abhinav Kumar wrote:
> Add a helper to check whether a dp_panel is mst capable.
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_aux.h   |  1 +
>  drivers/gpu/drm/msm/dp/dp_panel.c | 14 ++++++++++++++
>  drivers/gpu/drm/msm/dp/dp_panel.h |  1 +
>  3 files changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.h b/drivers/gpu/drm/msm/dp/dp_aux.h
> index 39c5b4c8596ab28d822493a6b4d479f5f786cdee..cb97a73cdd6ea74b612053bec578247a42214f23 100644
> --- a/drivers/gpu/drm/msm/dp/dp_aux.h
> +++ b/drivers/gpu/drm/msm/dp/dp_aux.h
> @@ -8,6 +8,7 @@
>  
>  #include "dp_catalog.h"
>  #include <drm/display/drm_dp_helper.h>
> +#include <drm/display/drm_dp_mst_helper.h>
>  
>  int msm_dp_aux_register(struct drm_dp_aux *msm_dp_aux);
>  void msm_dp_aux_unregister(struct drm_dp_aux *msm_dp_aux);
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index d277e9b2cbc03688976b6aa481ee724b186bab51..172de804dec445cb08ad8e3f058407f483cd6684 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -108,6 +108,20 @@ static u32 msm_dp_panel_get_supported_bpp(struct msm_dp_panel *msm_dp_panel,
>  	return min_supported_bpp;
>  }
>  
> +bool msm_dp_panel_read_mst_cap(struct msm_dp_panel *msm_dp_panel)
> +{
> +	struct msm_dp_panel_private *panel;
> +
> +	if (!msm_dp_panel) {
> +		DRM_ERROR("invalid input\n");
> +		return 0;
> +	}
> +
> +	panel = container_of(msm_dp_panel, struct msm_dp_panel_private, msm_dp_panel);
> +
> +	return drm_dp_read_mst_cap(panel->aux, msm_dp_panel->dpcd);

So, it's a one-line wrapper. Do we actually need it?

> +}
> +
>  int msm_dp_panel_read_link_caps(struct msm_dp_panel *msm_dp_panel,
>  				struct drm_connector *connector)
>  {
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
> index 7a38655c443af597c84fb78c6702b2a3ef9822ed..363b416e4cbe290f9c0e6171d6c0c5170f9fea62 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.h
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.h
> @@ -67,6 +67,7 @@ int msm_dp_panel_get_modes(struct msm_dp_panel *msm_dp_panel,
>  		struct drm_connector *connector);
>  void msm_dp_panel_handle_sink_request(struct msm_dp_panel *msm_dp_panel);
>  void msm_dp_panel_tpg_config(struct msm_dp_panel *msm_dp_panel, bool enable);
> +bool msm_dp_panel_read_mst_cap(struct msm_dp_panel *dp_panel);
>  
>  /**
>   * is_link_rate_valid() - validates the link rate
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry