linux-kernel - Re: [PATCH 16/45] drm/msm/dp: add support for programming p1 register block

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Message-ID: <ku6ytypptjtydcgscdvwsi62cgxokxn6svwwzs2ce3otnnlrrl@uvr6st3365kv>
Date: Sun, 8 Dec 2024 08:22:42 +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 16/45] drm/msm/dp: add support for programming p1
 register block

On Thu, Dec 05, 2024 at 08:31:47PM -0800, Abhinav Kumar wrote:
> p1 register block is needed for the second mst stream.
> Add support in the catalog to be able to program this block.
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_catalog.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)

> @@ -145,6 +148,26 @@ static inline u32 msm_dp_read_p0(struct msm_dp_catalog_private *catalog,
>  	return readl_relaxed(catalog->io.p0.base + offset);
>  }
>  
> +static inline void msm_dp_write_p1(struct msm_dp_catalog_private *catalog,
> +				   u32 offset, u32 data)
> +{
> +	/*
> +	 * To make sure interface reg writes happens before any other operation,
> +	 * this function uses writel() instread of writel_relaxed()
> +	 */
> +	writel(data, catalog->io.p1.base + offset);
> +}
> +
> +static inline u32 msm_dp_read_p1(struct msm_dp_catalog_private *catalog,
> +				 u32 offset)
> +{
> +	/*
> +	 * To make sure interface reg writes happens before any other operation,
> +	 * this function uses writel() instread of writel_relaxed()
> +	 */
> +	return readl_relaxed(catalog->io.p1.base + offset);
> +}

After looking at the actual code, please implement
msm_dp_read_pn(stream_id)  / msm_dp_write_pn(stream_id)

> +
>  static inline u32 msm_dp_read_link(struct msm_dp_catalog_private *catalog, u32 offset)
>  {
>  	return readl_relaxed(catalog->io.link.base + offset);

-- 
With best wishes
Dmitry