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drm/i915/gt: Update PMINTRMSK holding fw 

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 <currojerez@riseup.net>
Suggested-by: Francisco Jerez <currojerez@riseup.net>
Fixes: 35cc7f32c2 ("drm/i915/gt: Use non-forcewake writes for RPS")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Francisco Jerez <currojerez@riseup.net>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Cc: <stable@vger.kernel.org> # v5.6+
Link: https://patchwork.freedesktop.org/patch/msgid/20200415170318.16771-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-04-15 18:03:18 +01:00
parent 46495adc6c
commit a080bd994c
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/i915/gt/intel_rps.c
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@ -81,13 +81,14 @@ static void rps_enable_interrupts(struct intel_rps *rps)
events = (GEN6_PM_RP_UP_THRESHOLD |
GEN6_PM_RP_DOWN_THRESHOLD |
GEN6_PM_RP_DOWN_TIMEOUT);
WRITE_ONCE(rps->pm_events, events);
spin_lock_irq(&gt->irq_lock);
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)
@ -120,7 +121,9 @@ static void rps_disable_interrupts(struct intel_rps *rps)
struct intel_gt *gt = rps_to_gt(rps);
WRITE_ONCE(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);