linux-kernel - Re: [PATCH] drm/msm: update the high bitfield of certain DSI registers

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Message-ID: <e6bg2nin5zqoemjxevqhzhshgeit24t6wxb3pnfazrk6hkxajq@773bvnmqs5id>
Date: Fri, 1 Aug 2025 20:41:01 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Ayushi Makhija <quic_amakhija@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        robdclark@...il.com, lumag@...nel.org, sean@...rly.run,
        marijn.suijten@...ainline.org, airlied@...il.com, simona@...ll.ch,
        quic_rajeevny@...cinc.com, quic_vproddut@...cinc.com,
        quic_jesszhan@...cinc.com
Subject: Re: [PATCH] drm/msm: update the high bitfield of certain DSI
 registers

On Wed, Jul 30, 2025 at 06:09:38PM +0530, Ayushi Makhija wrote:
> Currently, the high bitfield of certain DSI registers
> do not align with the configuration of the SWI registers
> description. This can lead to wrong programming these DSI
> registers, for example for 4k resloution where H_TOTAL is
> taking 13 bits but software is programming only 12 bits
> because of the incorrect bitmask for H_TOTAL bitfeild,
> this is causing DSI FIFO errors. To resolve this issue,
> increase the high bitfield of the DSI registers from 12 bits
> to 16 bits in dsi.xml to match the SWI register configuration.
> 

Fixes: 4f52f5e63b62 ("drm/msm: import XML display registers database")

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

> Signed-off-by: Ayushi Makhija <quic_amakhija@...cinc.com>
> ---
>  drivers/gpu/drm/msm/registers/display/dsi.xml | 28 +++++++++----------
>  1 file changed, 14 insertions(+), 14 deletions(-)

-- 
With best wishes
Dmitry