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    SubjectFAILED: Patch "drm/i915/dp: Limit SST link rate to <=8.1Gbps" failed to apply to 5.15-stable tree
    Date
    The patch below does not apply to the 5.15-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>.

    Thanks,
    Sasha

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

    From 6061811d72e14f41f71b6a025510920b187bfcca Mon Sep 17 00:00:00 2001
    From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
    Date: Thu, 8 Feb 2024 17:45:52 +0200
    Subject: [PATCH] drm/i915/dp: Limit SST link rate to <=8.1Gbps
    MIME-Version: 1.0
    Content-Type: text/plain; charset=UTF-8
    Content-Transfer-Encoding: 8bit

    Limit the link rate to HBR3 or below (<=8.1Gbps) in SST mode.
    UHBR (10Gbps+) link rates require 128b/132b channel encoding
    which we have not yet hooked up into the SST/no-sideband codepaths.

    Cc: stable@vger.kernel.org
    Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240208154552.14545-1-ville.syrjala@linux.intel.com
    Reviewed-by: Jani Nikula <jani.nikula@intel.com>
    ---
    drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
    index ab415f41924d7..5045c34a16be1 100644
    --- a/drivers/gpu/drm/i915/display/intel_dp.c
    +++ b/drivers/gpu/drm/i915/display/intel_dp.c
    @@ -2356,6 +2356,9 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
    limits->min_rate = intel_dp_common_rate(intel_dp, 0);
    limits->max_rate = intel_dp_max_link_rate(intel_dp);

    + /* FIXME 128b/132b SST support missing */
    + limits->max_rate = min(limits->max_rate, 810000);
    +
    limits->min_lane_count = 1;
    limits->max_lane_count = intel_dp_max_lane_count(intel_dp);

    --
    2.43.0




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