linux-kernel - Re: [PATCH 4/7] drm/msm/dpu: Allow configuring multiple active DSC blocks

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Date: Wed, 17 Apr 2024 14:59:34 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Marijn Suijten <marijn.suijten@...ainline.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Archit Taneja <architt@...eaurora.org>, Chandan Uddaraju <chandanu@...eaurora.org>, 
	Vinod Koul <vkoul@...nel.org>, Sravanthi Kollukuduru <skolluku@...eaurora.org>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Jordan Crouse <jordan@...micpenguin.net>, Rajesh Yadav <ryadav@...eaurora.org>, 
	Jeykumar Sankaran <jsanka@...eaurora.org>, ~postmarketos/upstreaming@...ts.sr.ht, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Martin Botka <martin.botka@...ainline.org>, 
	Jami Kettunen <jami.kettunen@...ainline.org>
Subject: Re: [PATCH 4/7] drm/msm/dpu: Allow configuring multiple active DSC blocks

On Wed, 17 Apr 2024 at 02:57, Marijn Suijten
<marijn.suijten@...ainline.org> wrote:
>
> Just like the active interface and writeback block in ctl_intf_cfg_v1(),
> and later the rest of the blocks in followup active-CTL fixes or
> reworks, multiple calls to this function should enable additional DSC
> blocks instead of overwriting the blocks that are enabled.
>
> This pattern is observed in an active-CTL scenario since DPU 5.0.0 where
> for example bonded-DSI uses a single CTL to drive multiple INTFs, and
> each encoder calls this function individually with the INTF (hence the
> pre-existing update instead of overwrite of this bitmask) and DSC blocks
> it wishes to be enabled, and expects them to be OR'd into the bitmask.
>
> The reverse already exists in reset_intf_cfg_v1() where only specified
> DSC blocks are removed out of the CTL_DSC_ACTIVE bitmask (same for all
> other blocks and ACTIVE bitmasks), leaving the rest enabled.
>
> Fixes: 77f6da90487c ("drm/msm/disp/dpu1: Add DSC support in hw_ctl")
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry