[PATCH 07/14] drm/i915/guc/slpc: Add methods to set min/max frequency

[Vinay Belgaumkar]

Add param set h2g helpers to set the min and max frequencies
for use by SLPC.

v2: Address review comments (Michal W)

Signed-off-by: Sundaresan Sujaritha <sujaritha.sundaresan at intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 84 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h |  2 +
 2 files changed, 86 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
index 48db2a8f67d1..b40c39ba4049 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
@@ -109,6 +109,18 @@ static u32 slpc_get_state(struct intel_guc_slpc *slpc)
 	return data->header.global_state;
 }
 
+static int guc_action_slpc_set_param(struct intel_guc *guc, u8 id, u32 value)
+{
+	u32 request[] = {
+		INTEL_GUC_ACTION_SLPC_REQUEST,
+ 		SLPC_EVENT(SLPC_EVENT_PARAMETER_SET, 2),
+		id,
+		value,
+	};
+
+ 	return intel_guc_send(guc, request, ARRAY_SIZE(request));
+}
+
 static bool slpc_is_running(struct intel_guc_slpc *slpc)
 {
 	return (slpc_get_state(slpc) == SLPC_GLOBAL_STATE_RUNNING);
@@ -143,6 +155,15 @@ static int slpc_query_task_state(struct intel_guc_slpc *slpc)
 	return ret;
 }
 
+static int slpc_set_param(struct intel_guc_slpc *slpc, u8 id, u32 value)
+{
+	struct intel_guc *guc = slpc_to_guc(slpc);
+
+	GEM_BUG_ON(id >= SLPC_MAX_PARAM);
+
+	return guc_action_slpc_set_param(guc, id, value);
+}
+
 static const char *slpc_state_string(struct intel_guc_slpc *slpc)
 {
 	const char *str = NULL;
@@ -238,6 +259,69 @@ u32 slpc_decode_max_freq(struct intel_guc_slpc *slpc)
 		GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER);
 }
 
+/**
+ * intel_guc_slpc_set_max_freq() - Set max frequency limit for SLPC.
+ * @slpc: pointer to intel_guc_slpc.
+ * @val: frequency (MHz)
+ *
+ * This function will invoke GuC SLPC action to update the max frequency
+ * limit for unslice.
+ *
+ * Return: 0 on success, non-zero error code on failure.
+ */
+int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
+{
+	int ret;
+	struct drm_i915_private *i915 = slpc_to_i915(slpc);
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
+		ret = slpc_set_param(slpc,
+			       SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
+			       val);
+		if (ret) {
+			drm_err(&i915->drm,
+				"Set max frequency unslice returned (%pe)\n", ERR_PTR(ret));
+			/* Return standardized err code for sysfs */
+			ret = -EIO;
+		}
+	}
+
+	return ret;
+}
+
+/**
+ * intel_guc_slpc_set_min_freq() - Set min frequency limit for SLPC.
+ * @slpc: pointer to intel_guc_slpc.
+ * @val: frequency (MHz)
+ *
+ * This function will invoke GuC SLPC action to update the min unslice
+ * frequency.
+ *
+ * Return: 0 on success, non-zero error code on failure.
+ */
+int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
+{
+	int ret;
+	struct intel_guc *guc = slpc_to_guc(slpc);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
+		ret = slpc_set_param(slpc,
+			       SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
+			       val);
+		if (ret) {
+			drm_err(&i915->drm,
+				"Set min frequency for unslice returned (%pe)\n", ERR_PTR(ret));
+			/* Return standardized err code for sysfs */
+			ret = -EIO;
+		}
+	}
+
+	return ret;
+}
+
 /*
  * intel_guc_slpc_enable() - Start SLPC
  * @slpc: pointer to intel_guc_slpc.
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
index f02249ff5f1b..3a1a7eaafc12 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
@@ -30,5 +30,7 @@ void intel_guc_slpc_init_early(struct intel_guc_slpc *slpc);
 int intel_guc_slpc_init(struct intel_guc_slpc *slpc);
 int intel_guc_slpc_enable(struct intel_guc_slpc *slpc);
 void intel_guc_slpc_fini(struct intel_guc_slpc *slpc);
+int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val);
+int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val);
 
 #endif
-- 
2.25.0