linux-kernel - Re: [PATCH 05/21] drm/msm/dpu: move resource allocation to CRTC

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Message-ID: <fiydda6an5a4dc2gmrj4fnti4ymkk7ntbtpq6mgushmgnzl6cp@pwtz6goteljh>
Date: Fri, 30 Aug 2024 19:42:52 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, quic_abhinavk@...cinc.com, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, quic_ebharadw@...cinc.com, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH 05/21] drm/msm/dpu: move resource allocation to CRTC

On Thu, Aug 29, 2024 at 01:48:26PM GMT, Jessica Zhang wrote:
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> 
> All resource allocation is centered around the LMs. Then other blocks
> (except DSCs) are allocated basing on the LMs that was selected, and LM
> powers up the CRTC rather than the encoder.
> 
> Moreover if at some point the driver supports encoder cloning,
> allocating resources from the encoder will be incorrect, as all clones
> will have different encoder IDs, while LMs are to be shared by these
> encoders.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> [quic_abhinavk@...cinc.com: Refactored resource allocation for CDM]
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> [quic_jesszhan@...cinc.com: Changed to grabbing exising global state and
> dropped clearing num_mixers in crtc_disable]

Hmm, I still see the chunk in dpu_crtc_disable(). I think the chunk is
correct so that if there is a disable/enable pair of calls with no
intermediate mode_set then num_mixers carry over the correct value.

> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  89 +++++++++++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 201 +++++++++++-----------------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  19 +++
>  3 files changed, 183 insertions(+), 126 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 4c1be2f0555f..3296b0650056 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1091,9 +1091,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>  
>  	dpu_core_perf_crtc_update(crtc, 0);
>  
> -	memset(cstate->mixers, 0, sizeof(cstate->mixers));
> -	cstate->num_mixers = 0;
> -
>  	/* disable clk & bw control until clk & bw properties are set */
>  	cstate->bw_control = false;
>  	cstate->bw_split_vote = false;

-- 
With best wishes
Dmitry