The patch below does not apply to the 6.7-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.7.y git checkout FETCH_HEAD git cherry-pick -x 65550a9cc5c371b4027c8e8199293899cb2f5af7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024012702-liftoff-superhero-dd66@gregkh' --subject-prefix 'PATCH 6.7.y' HEAD^..

Possible dependencies:

65550a9cc5c3 ("drm/amd/display: disable FPO and SubVP for older DMUB versions on DCN32x")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 65550a9cc5c371b4027c8e8199293899cb2f5af7 Mon Sep 17 00:00:00 2001 From: Hamza Mahfooz hamza.mahfooz@amd.com Date: Fri, 15 Dec 2023 10:37:39 -0500 Subject: [PATCH] drm/amd/display: disable FPO and SubVP for older DMUB versions on DCN32x

There have recently been changes that break backwards compatibility, that were introduced into DMUB firmware (for DCN32x) concerning FPO and SubVP. So, since those are just power optimization features, we can just disable them unless the user is using a new enough version of DMUB firmware.

Cc: stable@vger.kernel.org Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2870 Fixes: ed6e2782e974 ("drm/amd/display: For cursor P-State allow for SubVP") Reported-by: Mikhail Gavrilov mikhail.v.gavrilov@gmail.com Closes: https://lore.kernel.org/r/CABXGCsNRb0QbF2pKLJMDhVOKxyGD6-E+8p-4QO6FOWa6zp22_... Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c index 5c323718ec90..0f0972ad441a 100644 --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c @@ -960,6 +960,12 @@ void dcn32_init_hw(struct dc *dc) dc->caps.dmub_caps.subvp_psr = dc->ctx->dmub_srv->dmub->feature_caps.subvp_psr_support; dc->caps.dmub_caps.gecc_enable = dc->ctx->dmub_srv->dmub->feature_caps.gecc_enable; dc->caps.dmub_caps.mclk_sw = dc->ctx->dmub_srv->dmub->feature_caps.fw_assisted_mclk_switch; + + if (dc->ctx->dmub_srv->dmub->fw_version < + DMUB_FW_VERSION(7, 0, 35)) { + dc->debug.force_disable_subvp = true; + dc->debug.disable_fpo_optimizations = true; + } } }