[PATCH 5.6 164/167] drm/i915/gt: Update PMINTRMSK holding fw

[Greg Kroah-Hartman]

From: Chris Wilson <ch...@chris-wilson.co.uk>

commit e1eb075c5051987fbbadbc0fb8211679df657721 upstream.

If we use a non-forcewaked write to PMINTRMSK, it does not take effect
until much later, if at all, causing a loss of RPS interrupts and no GPU
reclocking, leaving the GPU running at the wrong frequency for long
periods of time.

Reported-by: Francisco Jerez <curroje...@riseup.net>
Suggested-by: Francisco Jerez <curroje...@riseup.net>
Fixes: 35cc7f32c298 ("drm/i915/gt: Use non-forcewake writes for RPS")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Francisco Jerez <curroje...@riseup.net>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: Andi Shyti <andi.sh...@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Reviewed-by: Andi Shyti <andi.sh...@intel.com>
Reviewed-by: Francisco Jerez <curroje...@riseup.net>
Cc: <sta...@vger.kernel.org> # v5.6+
Link: 
https://patchwork.freedesktop.org/patch/msgid/20200415170318.16771-2-ch...@chris-wilson.co.uk
(cherry picked from commit a080bd994c4023042a2b605c65fa10a25933f636)
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/gpu/drm/i915/gt/intel_rps.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -83,7 +83,8 @@ static void rps_enable_interrupts(struct
        gen6_gt_pm_enable_irq(gt, rps->pm_events);
        spin_unlock_irq(&gt->irq_lock);
 
-       set(gt->uncore, GEN6_PMINTRMSK, rps_pm_mask(rps, rps->cur_freq));
+       intel_uncore_write(gt->uncore,
+                          GEN6_PMINTRMSK, rps_pm_mask(rps, rps->last_freq));
 }
 
 static void gen6_rps_reset_interrupts(struct intel_rps *rps)
@@ -117,7 +118,8 @@ static void rps_disable_interrupts(struc
 
        rps->pm_events = 0;
 
-       set(gt->uncore, GEN6_PMINTRMSK, rps_pm_sanitize_mask(rps, ~0u));
+       intel_uncore_write(gt->uncore,
+                          GEN6_PMINTRMSK, rps_pm_sanitize_mask(rps, ~0u));
 
        spin_lock_irq(&gt->irq_lock);
        gen6_gt_pm_disable_irq(gt, GEN6_PM_RPS_EVENTS);