[PATCH 2/3] drm/i915/rps: Expose get_requested_frequency_fw for PMU

[Ashutosh Dixit]

Expose intel_rps_get_requested_frequency_fw to read the requested freq
without taking forcewake. This is done for use by PMU which does not take
forcewake when reading freq. The code is refactored to use a common set of
functions across sysfs and PMU. It also allows PMU to support both host
turbo (rps) and slpc which was previously missed due to the non-use of
common functions across sysfs and PMU.

Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_rps.c | 22 +++++++++++++++++++---
 drivers/gpu/drm/i915/gt/intel_rps.h |  2 +-
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 0a8e24bcb874..49df31927c0e 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -2154,7 +2154,7 @@ u32 intel_rps_read_actual_frequency_fw(struct intel_rps *rps)
 	return freq;
 }
 
-u32 intel_rps_read_punit_req(struct intel_rps *rps)
+static u32 intel_rps_read_punit_req(struct intel_rps *rps, bool take_fw)
 {
 	struct intel_uncore *uncore = rps_to_uncore(rps);
 	struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
@@ -2162,7 +2162,8 @@ u32 intel_rps_read_punit_req(struct intel_rps *rps)
 	u32 freq = 0;
 
 	with_intel_runtime_pm_if_in_use(rpm, wakeref)
-		freq = intel_uncore_read(uncore, GEN6_RPNSWREQ);
+		freq = take_fw ? intel_uncore_read(uncore, GEN6_RPNSWREQ) :
+			intel_uncore_read_fw(uncore, GEN6_RPNSWREQ);
 
 	return freq;
 }
@@ -2176,7 +2177,7 @@ static u32 intel_rps_get_req(u32 pureq)
 
 u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps)
 {
-	u32 freq = intel_rps_get_req(intel_rps_read_punit_req(rps));
+	u32 freq = intel_rps_get_req(intel_rps_read_punit_req(rps, true));
 
 	return intel_gpu_freq(rps, freq);
 }
@@ -2189,6 +2190,21 @@ u32 intel_rps_get_requested_frequency(struct intel_rps *rps)
 		return intel_gpu_freq(rps, rps->cur_freq);
 }
 
+static u32 intel_rps_read_punit_req_frequency_fw(struct intel_rps *rps)
+{
+	u32 freq = intel_rps_get_req(intel_rps_read_punit_req(rps, false));
+
+	return intel_gpu_freq(rps, freq);
+}
+
+u32 intel_rps_get_requested_frequency_fw(struct intel_rps *rps)
+{
+	if (rps_uses_slpc(rps))
+		return intel_rps_read_punit_req_frequency_fw(rps);
+	else
+		return intel_gpu_freq(rps, rps->cur_freq);
+}
+
 u32 intel_rps_get_max_frequency(struct intel_rps *rps)
 {
 	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index 63511b826a97..a990f985ab23 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -41,6 +41,7 @@ u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat1);
 u32 intel_rps_read_actual_frequency(struct intel_rps *rps);
 u32 intel_rps_read_actual_frequency_fw(struct intel_rps *rps);
 u32 intel_rps_get_requested_frequency(struct intel_rps *rps);
+u32 intel_rps_get_requested_frequency_fw(struct intel_rps *rps);
 u32 intel_rps_get_min_frequency(struct intel_rps *rps);
 u32 intel_rps_get_min_raw_freq(struct intel_rps *rps);
 int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val);
@@ -50,7 +51,6 @@ int intel_rps_set_max_frequency(struct intel_rps *rps, u32 val);
 u32 intel_rps_get_rp0_frequency(struct intel_rps *rps);
 u32 intel_rps_get_rp1_frequency(struct intel_rps *rps);
 u32 intel_rps_get_rpn_frequency(struct intel_rps *rps);
-u32 intel_rps_read_punit_req(struct intel_rps *rps);
 u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
 u32 intel_rps_read_rpstat(struct intel_rps *rps);
 u32 intel_rps_read_rpstat_fw(struct intel_rps *rps);
-- 
2.38.0