[PATCH 2/3] drm/i915: Make EDP PSR flags not depend on enum values

[Imre Deak <imre.deak@intel.com>]

Depending on the transcoder enum values to translate from transcoder
to EDP PSR flags can easily break if we add a new transcoder. So remove
the dependency by using an explicit mapping.

While at it also add a WARN for unexpected trancoders.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h  | 10 ++++--
 drivers/gpu/drm/i915/intel_psr.c | 70 +++++++++++++++++++++++++++++-----------
 2 files changed, 59 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index edb58af1e903..25b069175c2a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4150,9 +4150,13 @@ enum {
 /* Bspec claims those aren't shifted but stay at 0x64800 */
 #define EDP_PSR_IMR				_MMIO(0x64834)
 #define EDP_PSR_IIR				_MMIO(0x64838)
-#define   EDP_PSR_ERROR(trans)			(1 << (((trans) * 8 + 10) & 31))
-#define   EDP_PSR_POST_EXIT(trans)		(1 << (((trans) * 8 + 9) & 31))
-#define   EDP_PSR_PRE_ENTRY(trans)		(1 << (((trans) * 8 + 8) & 31))
+#define   _EDP_PSR_ERROR(idx)			(1 << ((idx) * 8 + 2))
+#define   _EDP_PSR_POST_EXIT(idx)		(1 << ((idx) * 8 + 1))
+#define   _EDP_PSR_PRE_ENTRY(idx)		(1 << ((idx) * 8))
+#define   _EDP_PSR_TRANSCODER_A_IDX		1
+#define   _EDP_PSR_TRANSCODER_B_IDX		2
+#define   _EDP_PSR_TRANSCODER_C_IDX		3
+#define   _EDP_PSR_TRANSCODER_EDP_IDX		0
 
 #define EDP_PSR_AUX_CTL				_MMIO(dev_priv->psr_mmio_base + 0x10)
 #define   EDP_PSR_AUX_CTL_TIME_OUT_MASK		(3 << 26)
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 48df16a02fac..5fdc2f196045 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -83,25 +83,59 @@ static bool intel_psr2_enabled(struct drm_i915_private *dev_priv,
 	}
 }
 
+static int edp_psr_transcoder_idx(enum transcoder trans)
+{
+	int trans_to_idx[] = {
+		[TRANSCODER_A] = _EDP_PSR_TRANSCODER_A_IDX,
+		[TRANSCODER_B] = _EDP_PSR_TRANSCODER_B_IDX,
+		[TRANSCODER_C] = _EDP_PSR_TRANSCODER_C_IDX,
+		[TRANSCODER_EDP] = _EDP_PSR_TRANSCODER_EDP_IDX,
+	};
+
+	switch (trans) {
+	case TRANSCODER_A:
+	case TRANSCODER_B:
+	case TRANSCODER_C:
+	case TRANSCODER_EDP:
+		return trans_to_idx[trans];
+	default:
+		MISSING_CASE(trans);
+		return trans_to_idx[TRANSCODER_EDP];
+	}
+}
+
+static u32 edp_psr_error(enum transcoder trans)
+{
+	return _EDP_PSR_ERROR(edp_psr_transcoder_idx(trans));
+}
+
+static u32 edp_psr_post_exit(enum transcoder trans)
+{
+	return _EDP_PSR_POST_EXIT(edp_psr_transcoder_idx(trans));
+}
+
+static u32 edp_psr_pre_entry(enum transcoder trans)
+{
+	return _EDP_PSR_PRE_ENTRY(edp_psr_transcoder_idx(trans));
+}
+
 void intel_psr_irq_control(struct drm_i915_private *dev_priv, u32 debug)
 {
 	u32 debug_mask, mask;
+	enum transcoder cpu_transcoder;
+	u32 transcoders = BIT(TRANSCODER_EDP);
 
-	mask = EDP_PSR_ERROR(TRANSCODER_EDP);
-	debug_mask = EDP_PSR_POST_EXIT(TRANSCODER_EDP) |
-		     EDP_PSR_PRE_ENTRY(TRANSCODER_EDP);
-
-	if (INTEL_GEN(dev_priv) >= 8) {
-		mask |= EDP_PSR_ERROR(TRANSCODER_A) |
-			EDP_PSR_ERROR(TRANSCODER_B) |
-			EDP_PSR_ERROR(TRANSCODER_C);
-
-		debug_mask |= EDP_PSR_POST_EXIT(TRANSCODER_A) |
-			      EDP_PSR_PRE_ENTRY(TRANSCODER_A) |
-			      EDP_PSR_POST_EXIT(TRANSCODER_B) |
-			      EDP_PSR_PRE_ENTRY(TRANSCODER_B) |
-			      EDP_PSR_POST_EXIT(TRANSCODER_C) |
-			      EDP_PSR_PRE_ENTRY(TRANSCODER_C);
+	if (INTEL_GEN(dev_priv) >= 8)
+		transcoders |= BIT(TRANSCODER_A) |
+			       BIT(TRANSCODER_B) |
+			       BIT(TRANSCODER_C);
+
+	debug_mask = 0;
+	mask = 0;
+	for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
+		mask |= edp_psr_error(cpu_transcoder);
+		debug_mask |= edp_psr_post_exit(cpu_transcoder) |
+			      edp_psr_pre_entry(cpu_transcoder);
 	}
 
 	if (debug & I915_PSR_DEBUG_IRQ)
@@ -160,17 +194,17 @@ void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
 
 	for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
 		/* FIXME: Exit PSR and link train manually when this happens. */
-		if (psr_iir & EDP_PSR_ERROR(cpu_transcoder))
+		if (psr_iir & edp_psr_error(cpu_transcoder))
 			DRM_DEBUG_KMS("[transcoder %s] PSR aux error\n",
 				      transcoder_name(cpu_transcoder));
 
-		if (psr_iir & EDP_PSR_PRE_ENTRY(cpu_transcoder)) {
+		if (psr_iir & edp_psr_pre_entry(cpu_transcoder)) {
 			dev_priv->psr.last_entry_attempt = time_ns;
 			DRM_DEBUG_KMS("[transcoder %s] PSR entry attempt in 2 vblanks\n",
 				      transcoder_name(cpu_transcoder));
 		}
 
-		if (psr_iir & EDP_PSR_POST_EXIT(cpu_transcoder)) {
+		if (psr_iir & edp_psr_post_exit(cpu_transcoder)) {
 			dev_priv->psr.last_exit = time_ns;
 			DRM_DEBUG_KMS("[transcoder %s] PSR exit completed\n",
 				      transcoder_name(cpu_transcoder));
-- 
2.13.2

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