linux-kernel - Re: [PATCH] drm/msm/dpu: Adjust CDM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <732vgwega4ok3tkbefyxixyfdonfenik5q5zhdxqot62aygavt@s2m3m7gzjgb7>
Date: Thu, 6 Mar 2025 08:46:50 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dpu: Adjust CDM_MUX to support CWB PINGPONG

On Wed, Mar 05, 2025 at 09:15:10PM -0800, Abhinav Kumar wrote:
> 
> 
> On 3/5/2025 7:16 PM, Jessica Zhang wrote:
> > Similar to WB_MUX, CDM_MUX also needs to be adjusted to support
> > dedicated CWB PINGPONGs
> > 
> > Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> 
> Not exactly sure which fixes tag to use here, but
> since this should have ideally been addressed together while adding the WB
> mux programming to handle CWB, I am going with
> 
> Fixes: a31a610fd44b ("drm/msm/dpu: add CWB support to dpu_hw_wb")

I don't think it needs Fixes tag. The patch is good to go on its own.

> 
> Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> > index ae1534c49ae0..3f88c3641d4a 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> > @@ -214,7 +214,9 @@ static void dpu_hw_cdm_bind_pingpong_blk(struct dpu_hw_cdm *ctx, const enum dpu_
> >   	mux_cfg = DPU_REG_READ(c, CDM_MUX);
> >   	mux_cfg &= ~0xf;
> > -	if (pp)
> > +	if (pp >= PINGPONG_CWB_0)
> > +		mux_cfg |= 0xd;
> > +	else if (pp)
> >   		mux_cfg |= (pp - PINGPONG_0) & 0x7;
> >   	else
> >   		mux_cfg |= 0xf;
> > 
> > ---
> > base-commit: 6d3175a72cc07e90f81fb35841048a8a9b5134cb
> > change-id: 20250305-cdm-cwb-mux-fix-69ed5297d4f7
> > 
> > Best regards,
> 

-- 
With best wishes
Dmitry