[Intel-gfx] [PATCH 6/6] drm/i915/rps: Freq caps for MTL

[Ashutosh Dixit]

For MTL, when reading from HW, RP0, RP1 (actuall RPe) and RPn freq use an
entirely different set of registers with different fields, bitwidths and
units.

Cc: Badal Nilawar <badal.nilawar at intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_rps.c | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h     |  9 +++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 579ae9ac089c..e7ab172698e3 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -1085,6 +1085,23 @@ static u32 intel_rps_read_state_cap(struct intel_rps *rps)
 		return intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
 }
 
+static void
+mtl_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps)
+{
+	struct intel_uncore *uncore = rps_to_uncore(rps);
+	u32 rp_state_cap = rps_to_gt(rps)->type == GT_MEDIA ?
+				intel_uncore_read(uncore, MTL_MEDIAP_STATE_CAP) :
+				intel_uncore_read(uncore, MTL_RP_STATE_CAP);
+	u32 rpe = rps_to_gt(rps)->type == GT_MEDIA ?
+			intel_uncore_read(uncore, MTL_MPE_FREQUENCY) :
+			intel_uncore_read(uncore, MTL_GT_RPE_FREQUENCY);
+
+	/* MTL values are in units of 16.67 MHz */
+	caps->rp0_freq = REG_FIELD_GET(MTL_RP0_CAP_MASK, rp_state_cap);
+	caps->min_freq = REG_FIELD_GET(MTL_RPN_CAP_MASK, rp_state_cap);
+	caps->rp1_freq = REG_FIELD_GET(MTL_RPE_MASK, rpe);
+}
+
 /**
  * gen6_rps_get_freq_caps - Get freq caps exposed by HW
  * @rps: the intel_rps structure
@@ -1098,6 +1115,9 @@ void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *c
 	struct drm_i915_private *i915 = rps_to_i915(rps);
 	u32 rp_state_cap;
 
+	if (IS_METEORLAKE(i915))
+		return mtl_get_freq_caps(rps, caps);
+
 	rp_state_cap = intel_rps_read_state_cap(rps);
 
 	/* static values from HW: RP0 > RP1 > RPn (min_freq) */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 06d555321651..d78f9675aa57 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1792,6 +1792,15 @@
 #define XEHPSDV_RP_STATE_CAP	_MMIO(0x250014)
 #define PVC_RP_STATE_CAP	_MMIO(0x281014)
 
+#define MTL_RP_STATE_CAP	_MMIO(0x138000)
+#define MTL_MEDIAP_STATE_CAP	_MMIO(0x138020)
+#define   MTL_RP0_CAP_MASK	REG_GENMASK(8, 0)
+#define   MTL_RPN_CAP_MASK	REG_GENMASK(24, 16)
+
+#define MTL_GT_RPE_FREQUENCY	_MMIO(0x13800c)
+#define MTL_MPE_FREQUENCY	_MMIO(0x13802c)
+#define   MTL_RPE_MASK		REG_GENMASK(8, 0)
+
 #define GT0_PERF_LIMIT_REASONS		_MMIO(0x1381a8)
 #define   GT0_PERF_LIMIT_REASONS_MASK	0xde3
 #define   PROCHOT_MASK			REG_BIT(1)
-- 
2.34.1