[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20220217223707.zsqdzu5uqplg33p2@SoMainline.org>
Date: Thu, 17 Feb 2022 23:37:07 +0100
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Vinod Koul <vkoul@...nel.org>
Cc: Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org,
Bjorn Andersson <bjorn.andersson@...aro.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jonathan Marek <jonathan@...ek.ca>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Abhinav Kumar <abhinavk@...eaurora.org>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org
Subject: Re: [REPOST PATCH v4 10/13] drm/msm/disp/dpu1: Add support for DSC
in topology
On 2022-02-10 16:04:20, Vinod Koul wrote:
> For DSC to work we typically need a 2,2,1 configuration. This should
> suffice for resolutions up to 4k. For more resolutions like 8k this won't
> work.
>
> Also, it is better to use 2 LMs and DSC instances as half width results
> in lesser power consumption as compared to single LM, DSC at full width.
>
> The panel has been tested only with 2,2,1 configuration, so for
> now we blindly create 2,2,1 topology when DSC is enabled
>
> Co-developed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> Signed-off-by: Abhinav Kumar <abhinavk@...eaurora.org>
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 13 +++++++++++++
> drivers/gpu/drm/msm/msm_drv.h | 2 ++
> 2 files changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 95a7bf362e81..13ccb7b3cce5 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -574,8 +574,21 @@ static struct msm_display_topology dpu_encoder_get_topology(
> topology.num_enc = 0;
> topology.num_intf = intf_count;
>
> + if (dpu_enc->dsc) {
> + /* In case of Display Stream Compression DSC, we would use
Just like elsewhere, since you wrote out Display Stream Compression,
write the "DSC" abbreviation between parentheses ()?
- Marijn
> + * 2 encoders, 2 line mixers and 1 interface
+ 2 DSC "blocks"?
> + * this is power optimal and can drive up to (including) 4k
> + * screens
> + */
> + topology.num_enc = 2;
> + topology.num_dsc = 2;
> + topology.num_intf = 1;
> + topology.num_lm = 2;
> + }
> +
> return topology;
> }
> +
> static int dpu_encoder_virt_atomic_check(
> struct drm_encoder *drm_enc,
> struct drm_crtc_state *crtc_state,
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 6425a42e997c..994d895d1a47 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -103,12 +103,14 @@ enum msm_event_wait {
> * @num_enc: number of compression encoder blocks used
> * @num_intf: number of interfaces the panel is mounted on
> * @num_dspp: number of dspp blocks used
> + * @num_dsc: number of Display Stream Compression (DSC) blocks used
> */
> struct msm_display_topology {
> u32 num_lm;
> u32 num_enc;
> u32 num_intf;
> u32 num_dspp;
> + u32 num_dsc;
> };
>
> /**
> --
> 2.31.1
>
Powered by blists - more mailing lists