Matt Roper 78cc55e0b6 drm/i915/mcr: Hold GT forcewake during steering operations ... The steering control and semaphore registers are inside an "always on" power domain with respect to RC6. However there are some issues if higher-level platform sleep states are entering/exiting at the same time these registers are accessed. Grabbing GT forcewake and holding it over the entire lock/steer/unlock cycle ensures that those sleep states have been fully exited before we access these registers. This is expected to become a formally documented/numbered workaround soon. Note that this patch alone isn't expected to have an immediately noticeable impact on MCR (mis)behavior; an upcoming pcode firmware update will also be necessary to provide the other half of this workaround. v2: - Move the forcewake inside the Xe_LPG-specific IP version check. This should only be necessary on platforms that have a steering semaphore. Fixes: 3100240bf8 ("drm/i915/mtl: Add hardware-level lock for steering") Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Cc: Jonathan Cavitt <jonathan.cavitt@intel.com> Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231019170241.2102037-2-matthew.d.roper@intel.com (cherry picked from commit 8fa1c7cd1f) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>		2023-10-25 08:44:26 -04:00
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