linux-kernel - Re: [PATCH 3/5] drm/msm: mdss: Add QCS8300 support

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Message-ID: <nllulh3vskl3hm3hvjux4khxtanqj7cpoytodwkzphwn4ajmo7@g46rgnhp637b>
Date: Wed, 27 Nov 2024 15:46:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Ritesh Kumar <quic_riteshk@...cinc.com>, 
	Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] drm/msm: mdss: Add QCS8300 support

On Wed, Nov 27, 2024 at 03:05:03PM +0800, Yongxing Mou wrote:
> Add Mobile Display Subsystem (MDSS) support for the QCS8300 platform.

Please mention, why do you need it at all. I see that the UBWC swizzle
and HBB settings are different. Is this really the case? Is it because
of the different memory being used on those platforms?

> 
> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
> ---
>  drivers/gpu/drm/msm/msm_mdss.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
> index b7bd899ead44bf86998e7295bccb31a334fa6811..90d8fe469d3134ec73f386153509ac257d75930a 100644
> --- a/drivers/gpu/drm/msm/msm_mdss.c
> +++ b/drivers/gpu/drm/msm/msm_mdss.c
> @@ -568,6 +568,16 @@ static const struct msm_mdss_data qcm2290_data = {
>  	.reg_bus_bw = 76800,
>  };
>  
> +static const struct msm_mdss_data qcs8300_data = {
> +	.ubwc_enc_version = UBWC_4_0,
> +	.ubwc_dec_version = UBWC_4_0,
> +	.ubwc_swizzle = 6,
> +	.ubwc_static = 1,
> +	.highest_bank_bit = 3,
> +	.macrotile_mode = 1,
> +	.reg_bus_bw = 74000,
> +};
> +
>  static const struct msm_mdss_data sa8775p_data = {
>  	.ubwc_enc_version = UBWC_4_0,
>  	.ubwc_dec_version = UBWC_4_0,
> @@ -715,6 +725,7 @@ static const struct of_device_id mdss_dt_match[] = {
>  	{ .compatible = "qcom,mdss" },
>  	{ .compatible = "qcom,msm8998-mdss", .data = &msm8998_data },
>  	{ .compatible = "qcom,qcm2290-mdss", .data = &qcm2290_data },
> +	{ .compatible = "qcom,qcs8300-mdss", .data = &qcs8300_data },
>  	{ .compatible = "qcom,sa8775p-mdss", .data = &sa8775p_data },
>  	{ .compatible = "qcom,sdm670-mdss", .data = &sdm670_data },
>  	{ .compatible = "qcom,sdm845-mdss", .data = &sdm845_data },
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry