From: abhinavk@codeaurora.org
To: Vinod Koul <vkoul@kernel.org>
Cc: Rob Clark <robdclark@gmail.com>,
Jonathan Marek <jonathan@marek.ca>,
Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
David Airlie <airlied@linux.ie>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
Bjorn Andersson <bjorn.andersson@linaro.org>,
dri-devel@lists.freedesktop.org, Daniel Vetter <daniel@ffwll.ch>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
freedreno@lists.freedesktop.org,
Sumit Semwal <sumit.semwal@linaro.org>
Subject: Re: [Freedreno] [PATCH 09/11] drm/msm/disp/dpu1: Add support for DSC in topology
Date: Mon, 02 Aug 2021 18:05:50 -0700 [thread overview]
Message-ID: <3fd739ca72c5704a3ca15a20492c5eac@codeaurora.org> (raw)
In-Reply-To: <20210715065203.709914-10-vkoul@kernel.org>
On 2021-07-14 23:52, Vinod Koul wrote:
> For DSC to work we typically need a 2,2,1 configuration. This should
> suffice for resolutions upto 4k. For more resolutions like 8k this
> won't
> work.
>
> The topology information is provided by DTS so we try to deduce the
> topology required for DSC.
> Furthermore, we can use 1 DSC encoder in lesser resolutions, but that
> is
> not power efficient according to Abhinav, it is better to use 2 mixers
> as that will split width/2 and is proven to be power efficient.
I think now that we have added the technical reason of why it is better
to use
2-2-1 ( using 2 LMs is better than one as it will half layer width), we
can drop my name from the commit text
as it holds less value than the actual reason itself :)
You can still keep my signed-off and co-developed by tag
>
> Also, 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@codeaurora.org>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> Signed-off-by: Vinod Koul <vkoul@kernel.org>
> ---
> Changes since RFC:
> - Add more details in changelog
>
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 41140b781e66..8f0a8bd9c8ff 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -573,6 +573,8 @@ static struct msm_display_topology
> dpu_encoder_get_topology(
> struct drm_display_mode *mode)
> {
> struct msm_display_topology topology = {0};
> + struct drm_encoder *drm_enc;
> + struct msm_drm_private *priv;
> int i, intf_count = 0;
>
> for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
> @@ -607,8 +609,22 @@ static struct msm_display_topology
> dpu_encoder_get_topology(
> topology.num_enc = 0;
> topology.num_intf = intf_count;
>
> + drm_enc = &dpu_enc->base;
> + priv = drm_enc->dev->dev_private;
> + if (priv && priv->dsc) {
if dsc is moved to the encoder, this will need to be changed too
> + /* In case of Display Stream Compression DSC, we would use
> + * 2 encoders, 2 line mixers and 1 interface
> + * this is power optimal and can drive upto (including) 4k
> + * screens
> + */
> + topology.num_enc = 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,
next prev parent reply other threads:[~2021-08-03 1:06 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-15 6:51 [PATCH 00/11] drm/msm: Add Display Stream Compression Support Vinod Koul
2021-07-15 6:51 ` [PATCH 01/11] drm/msm/dsi: add support for dsc data Vinod Koul
2021-08-02 22:55 ` [Freedreno] " abhinavk
2021-10-06 5:24 ` Vinod Koul
2021-07-15 6:51 ` [PATCH 02/11] drm/msm/disp/dpu1: Add support for DSC Vinod Koul
2021-07-19 8:28 ` kernel test robot
2021-08-02 23:03 ` [Freedreno] " abhinavk
2021-10-06 5:36 ` Vinod Koul
2021-07-15 6:51 ` [PATCH 03/11] drm/msm/disp/dpu1: Add support for DSC in pingpong block Vinod Koul
2021-08-02 23:07 ` [Freedreno] " abhinavk
2021-07-15 6:51 ` [PATCH 04/11] drm/msm/disp/dpu1: Add DSC support in RM Vinod Koul
2021-07-29 20:23 ` Dmitry Baryshkov
2021-10-06 10:26 ` Vinod Koul
2021-08-02 23:24 ` [Freedreno] " abhinavk
2021-10-06 10:27 ` Vinod Koul
2021-07-15 6:51 ` [PATCH 05/11] drm/msm/disp/dpu1: Add DSC for SDM845 to hw_catalog Vinod Koul
2021-07-29 20:25 ` Dmitry Baryshkov
2021-10-06 10:50 ` Vinod Koul
2021-08-02 23:29 ` [Freedreno] " abhinavk
2021-10-06 10:52 ` Vinod Koul
2021-07-15 6:51 ` [PATCH 06/11] drm/msm/disp/dpu1: Add DSC support in hw_ctl Vinod Koul
2021-07-29 22:15 ` Dmitry Baryshkov
2021-10-06 12:21 ` Vinod Koul
2021-08-03 0:00 ` [Freedreno] " abhinavk
2021-10-06 12:21 ` Vinod Koul
2021-07-15 6:51 ` [PATCH 07/11] drm/msm/disp/dpu1: Don't use DSC with mode_3d Vinod Koul
2021-08-03 0:24 ` [Freedreno] " abhinavk
2021-10-06 12:22 ` Vinod Koul
2021-07-15 6:52 ` [PATCH 08/11] drm/msm/disp/dpu1: Add support for DSC in encoder Vinod Koul
2021-07-19 8:54 ` kernel test robot
2021-07-29 20:54 ` Dmitry Baryshkov
2021-10-06 12:43 ` Vinod Koul
2021-08-03 0:57 ` [Freedreno] " abhinavk
2021-10-06 12:47 ` Vinod Koul
2021-07-15 6:52 ` [PATCH 09/11] drm/msm/disp/dpu1: Add support for DSC in topology Vinod Koul
2021-08-03 1:05 ` abhinavk [this message]
2021-07-15 6:52 ` [PATCH 10/11] drm/msm/dsi: Add support for DSC configuration Vinod Koul
2021-07-19 9:26 ` kernel test robot
2021-07-29 22:10 ` Dmitry Baryshkov
2021-08-03 1:16 ` [Freedreno] " abhinavk
2021-07-15 6:52 ` [PATCH 11/11] drm/msm/dsi: Pass DSC params to drm_panel Vinod Koul
2021-08-03 1:22 ` [Freedreno] " abhinavk
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