This commit fixes the issue.
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/i915?id=062499cc4813b5a3cbed5dd4fbe0177265858450
drm/i915/mtl+: Enable PPS before PLL
Enabling PPS after a display port's PLL is enabled leads to PLL / DDI
BUF timeouts during system resuming after a long (> 45 mins) suspended
state, at least on some ARL and MTL laptops, either all or some of them
also containing an Nvidia GPU. Enabling PPS first and then the PLL fixes
the problem for all the reporters.
A similar issue is seen when enabling an external DP output on PHY B
(vs. PHY A in the above eDP cases), where this change will not have any
effect (since no PPS is used in that case). There isn't any direct
connection between PPS and PLL, so the fix for eDP works by some
side-effect only. However Bspec does seem to require enabling PPS first,
so let's do that. Further investigation continues on the actual root
cause and a cure for external panels.
Fixes: 1a7fad2aea74 ("drm/i915/cx0: Enable dpll framework for MTL+")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16098
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16064
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16042
Cc: Mika Kahola <[email protected]>
Cc: [email protected] # v7.0+
Tested-by: Jouni Högander <[email protected]>
Tested-by: Marco Nenciarini <[email protected]>
Reviewed-by: Suraj Kandpal <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patch.msgid.link/[email protected]
(cherry picked from commit 28783a274e886dd6da61419be6020bd9d0384e9f)
Signed-off-by: Rodrigo Vivi <[email protected]>
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https://bugs.launchpad.net/bugs/2167549
Title:
ThinkPad P1 Gen 7 Meteor Lake — i915 PHY/DPLL failure after s2idle
resume
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