From de6b9ef5e70a275ffec21f4dfcbb4718f6b8fcfb Mon Sep 17 00:00:00 2001
From: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Date: Tue, 7 Sep 2021 16:27:04 -0700
Subject: drm/i915: Get PM ref before accessing HW register
Git-commit: 00598d5c69318a1fcb4147878e16754ba9103be6
Patch-mainline: v5.15-rc2
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Alt-commit: f25e3908b9cd4a3fe819e9bdcdde58f20bacb34c
Seeing these errors when GT is likely in suspend state-
"RPM wakelock ref not held during HW access"
Ensure GT is awake before trying to access HW registers. Avoid
reading the register if that is not the case.
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Fixes: 41e5c17ebfc2 ("drm/i915/guc/slpc: Sysfs hooks for SLPC")
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210907232704.12982-1-vinay.belgaumkar@intel.com
(cherry picked from commit f25e3908b9cd4a3fe819e9bdcdde58f20bacb34c)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/intel_rps.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index d812b27835f8..591a5224287e 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -1973,8 +1973,14 @@ u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
u32 intel_rps_read_punit_req(struct intel_rps *rps)
{
struct intel_uncore *uncore = rps_to_uncore(rps);
+ struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
+ intel_wakeref_t wakeref;
+ u32 freq = 0;
- return intel_uncore_read(uncore, GEN6_RPNSWREQ);
+ with_intel_runtime_pm_if_in_use(rpm, wakeref)
+ freq = intel_uncore_read(uncore, GEN6_RPNSWREQ);
+
+ return freq;
}
static u32 intel_rps_get_req(u32 pureq)
--
2.38.1