Patch "drm/vc4: hvs: Don't write gamma luts on 2711" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/vc4: hvs: Don't write gamma luts on 2711

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vc4-hvs-don-t-write-gamma-luts-on-2711.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c0a60c29eb861dad78c27ca5478871f71dfcd222
Author: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Date:   Fri Jun 21 16:20:38 2024 +0100

    drm/vc4: hvs: Don't write gamma luts on 2711
    
    [ Upstream commit 52efe364d1968ee3e3ed45eb44eb924b63635315 ]
    
    The gamma block has changed in 2711, therefore writing the lut
    in vc4_hvs_lut_load is incorrect.
    
    Whilst the gamma property isn't created for 2711, it is called
    from vc4_hvs_init_channel, so abort if attempted.
    
    Fixes: c54619b0bfb3 ("drm/vc4: Add support for the BCM2711 HVS5")
    Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-15-dave.stevenson@xxxxxxxxxxxxxxx
    Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index 04af672caacb1..1ac55c19197cb 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -222,6 +222,9 @@ static void vc4_hvs_lut_load(struct vc4_hvs *hvs,
 	if (!drm_dev_enter(drm, &idx))
 		return;
 
+	if (hvs->vc4->is_vc5)
+		return;
+
 	/* The LUT memory is laid out with each HVS channel in order,
 	 * each of which takes 256 writes for R, 256 for G, then 256
 	 * for B.




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