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Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement

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Control: tags -1 patch

Hi Diederik, Maxime,

On Wed, 10 May 2023 19:20:45 +0200, Diederik wrote:
> Control: forwarded -1 https://lore.kernel.org/all/20230127-rpi-cursor-corruption-v2-1-1f97bd00df01@cerno.tech/

I've found the time to test Maxime's vc4 dlist deferral patch -- with
minor adjustments to rebase against Debian's 6.12.22-1 kernel -- on an
rpi400 machine locally.

From testing two side-by-side kernel builds, one with the patch
applied, and one without it, I can attest that the patch does indeed
resolve the reported cursor/video speckling problem when using the
mini-HDMI port most-distant from the USB-C power port.

Note: the only modification required to rebase the patch was to
replace a conditional check for 'vc4->is_vc5' with 'vc4->gen ==
VC4_GEN_5' in a couple of the lines modified by the patch.  I've also
updated the line numbers to (hopefully) allow the patch to apply
cleanly without any fuzziness.

Thank you very much Maxime for providing the patch; please also find
my rebased version of it attached to this message.

Regards,
James

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Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement James Addison <jay@jp-hosting.net> - 2025-04-29 12:50 +0200
  Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Ben Hutchings <ben@decadent.org.uk> - 2025-07-12 18:40 +0200
    Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Maxime Ripard <mripard@kernel.org> - 2025-07-28 12:00 +0200
      Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement James Addison <jay@jp-hosting.net> - 2025-08-25 19:20 +0200
        Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Maxime Ripard <mripard@kernel.org> - 2025-08-27 12:10 +0200

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