From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
To: Pengyu Luo <mitltlatltl@gmail.com>
Cc: Rob Clark <robin.clark@oss.qualcomm.com>,
Dmitry Baryshkov <lumag@kernel.org>,
Abhinav Kumar <abhinav.kumar@linux.dev>,
Jessica Zhang <jesszhan0024@gmail.com>,
Sean Paul <sean@poorly.run>,
Marijn Suijten <marijn.suijten@somainline.org>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/msm/dsi: fix pclk rate calculation for bonded dsi
Date: Fri, 6 Mar 2026 18:50:32 +0200 [thread overview]
Message-ID: <6k4wgdu7x5z4b4erlgteljb4742brknbwnewoobwhv2qhqawde@wpkhreke3gsr> (raw)
In-Reply-To: <20260306163255.215456-1-mitltlatltl@gmail.com>
On Sat, Mar 07, 2026 at 12:32:38AM +0800, Pengyu Luo wrote:
> Recently, we round up new_hdisplay once at most, for bonded dsi, we
> may need twice, since they are independent links, we should round up
> each half separately. This also aligns with the hdisplay we program
> later in dsi_timing_setup()
>
> Example:
> full_hdisplay = 1904, dsc_bpp = 8, bpc = 8
> new_full_hdisplay = DIV_ROUND_UP(1904 * 8, 8 * 3) = 635
>
> if we use half display
> new_half_hdisplay = DIV_ROUND_UP(952 * 8, 8 * 3) = 318
> new_full_display = 636
>
> Fixes: 7c9e4a554d4a ("drm/msm/dsi: Reduce pclk rate for compression")
> Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
> ---
> drivers/gpu/drm/msm/dsi/dsi_host.c | 29 +++++++++++++++++++++++------
> 1 file changed, 23 insertions(+), 6 deletions(-)
>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
--
With best wishes
Dmitry
next prev parent reply other threads:[~2026-03-06 16:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 16:32 [PATCH] drm/msm/dsi: fix pclk rate calculation for bonded dsi Pengyu Luo
2026-03-06 16:50 ` Dmitry Baryshkov [this message]
2026-03-07 19:57 ` kernel test robot
2026-03-08 22:39 ` Claude review: " Claude Code Review Bot
2026-03-08 22:39 ` Claude Code Review Bot
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