[Intel-gfx] [PATCH 3/3] 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.

v2: Move MTL check into a separate function (Jani)

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Badal Nilawar <badal.nilawar at intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_rps.c | 46 +++++++++++++++++++++++------
 drivers/gpu/drm/i915/i915_reg.h     |  9 ++++++
 2 files changed, 46 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 6b86250c31ab..17b40b625e31 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -1085,15 +1085,25 @@ static u32 intel_rps_read_state_cap(struct intel_rps *rps)
 		return intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
 }
 
-/**
- * gen6_rps_get_freq_caps - Get freq caps exposed by HW
- * @rps: the intel_rps structure
- * @caps: returned freq caps
- *
- * Returned "caps" frequencies should be converted to MHz using
- * intel_gpu_freq()
- */
-void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps)
+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);
+}
+
+static void
+__gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps)
 {
 	struct drm_i915_private *i915 = rps_to_i915(rps);
 	u32 rp_state_cap;
@@ -1128,6 +1138,24 @@ void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *c
 	}
 }
 
+/**
+ * gen6_rps_get_freq_caps - Get freq caps exposed by HW
+ * @rps: the intel_rps structure
+ * @caps: returned freq caps
+ *
+ * Returned "caps" frequencies should be converted to MHz using
+ * intel_gpu_freq()
+ */
+void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps)
+{
+	struct drm_i915_private *i915 = rps_to_i915(rps);
+
+	if (IS_METEORLAKE(i915))
+		return mtl_get_freq_caps(rps, caps);
+	else
+		return __gen6_rps_get_freq_caps(rps, caps);
+}
+
 static void gen6_rps_init(struct intel_rps *rps)
 {
 	struct drm_i915_private *i915 = rps_to_i915(rps);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 38e895ad4b59..2101b6d6dae5 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(0)
-- 
2.34.1