linux-kernel - Re: [PATCH v2] drm/msm/dpu: Fall back to a single DSC encoder (1:1:1) on small SoCs

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Message-Id: <174063096235.3733075.3774428548713459070.b4-ty@linaro.org>
Date: Thu, 27 Feb 2025 06:37:31 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Sean Paul <sean@...rly.run>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Marijn Suijten <marijn.suijten@...ainline.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
	Martin Botka <martin.botka@...ainline.org>,
	Jami Kettunen <jami.kettunen@...ainline.org>,
	linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH v2] drm/msm/dpu: Fall back to a single DSC encoder (1:1:1) on small SoCs


On Wed, 22 Jan 2025 17:23:44 +0100, Marijn Suijten wrote:
> Some SoCs such as SC7280 (used in the Fairphone 5) have only a single
> DSC "hard slice" encoder.  The current hardcoded use of 2:2:1 topology
> (2 LM and 2 DSC for a single interface) make it impossible to use
> Display Stream Compression panels with mainline, which is exactly what's
> installed on the Fairphone 5.
> 
> By loosening the hardcoded `num_dsc = 2` to fall back to `num_dsc =
> 1` when the catalog only contains one entry, we can trivially support
> this phone and unblock further panel enablement on mainline.  A few
> more supporting changes in this patch ensure hardcoded constants of 2
> DSC encoders are replaced to count or read back the actual number of
> DSC hardware blocks that are enabled for the given virtual encoder.
> Likewise DSC_MODE_SPLIT_PANEL can no longer be unconditionally enabled.
> 
> [...]

Applied, thanks!

[1/1] drm/msm/dpu: Fall back to a single DSC encoder (1:1:1) on small SoCs
      https://gitlab.freedesktop.org/lumag/msm/-/commit/b6090ffb30f3

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>