[PATCH v3 1/2] drm/i915: Make sandybridge_pcode_read() deal with the second data register

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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

The pcode mailbox has two data registers. So far we've only ever used
the one, but that's about to change. Expose the second data register to
the callers of sandybridge_pcode_read().

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_debugfs.c   |  4 ++--
 drivers/gpu/drm/i915/intel_pm.c       | 12 +++++++-----
 drivers/gpu/drm/i915/intel_sideband.c | 15 +++++++++------
 drivers/gpu/drm/i915/intel_sideband.h |  3 ++-
 4 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 14cd83e9ea8b..203088f6f269 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1494,7 +1494,7 @@ static int gen6_drpc_info(struct seq_file *m)
 
 	if (INTEL_GEN(dev_priv) <= 7)
 		sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS,
-				       &rc6vids);
+				       &rc6vids, NULL);
 
 	seq_printf(m, "RC1e Enabled: %s\n",
 		   yesno(rcctl1 & GEN6_RC_CTL_RC1e_ENABLE));
@@ -1777,7 +1777,7 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
 		ia_freq = gpu_freq;
 		sandybridge_pcode_read(dev_priv,
 				       GEN6_PCODE_READ_MIN_FREQ_TABLE,
-				       &ia_freq);
+				       &ia_freq, NULL);
 		seq_printf(m, "%d\t\t%d\t\t\t\t%d\n",
 			   intel_gpu_freq(dev_priv, (gpu_freq *
 						     (IS_GEN9_BC(dev_priv) ||
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ef9fc77f8162..b043a96e123c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2822,7 +2822,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 		val = 0; /* data0 to be programmed to 0 for first set */
 		ret = sandybridge_pcode_read(dev_priv,
 					     GEN9_PCODE_READ_MEM_LATENCY,
-					     &val);
+					     &val, NULL);
 
 		if (ret) {
 			DRM_ERROR("SKL Mailbox read error = %d\n", ret);
@@ -2841,7 +2841,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 		val = 1; /* data0 to be programmed to 1 for second set */
 		ret = sandybridge_pcode_read(dev_priv,
 					     GEN9_PCODE_READ_MEM_LATENCY,
-					     &val);
+					     &val, NULL);
 		if (ret) {
 			DRM_ERROR("SKL Mailbox read error = %d\n", ret);
 			return;
@@ -7061,7 +7061,7 @@ static void gen6_init_rps_frequencies(struct drm_i915_private *dev_priv)
 
 		if (sandybridge_pcode_read(dev_priv,
 					   HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL,
-					   &ddcc_status) == 0)
+					   &ddcc_status, NULL) == 0)
 			rps->efficient_freq =
 				clamp_t(u8,
 					((ddcc_status >> 8) & 0xff),
@@ -7408,7 +7408,8 @@ static void gen6_enable_rc6(struct drm_i915_private *dev_priv)
 		   GEN6_RC_CTL_HW_ENABLE);
 
 	rc6vids = 0;
-	ret = sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids);
+	ret = sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS,
+				     &rc6vids, NULL);
 	if (IS_GEN(dev_priv, 6) && ret) {
 		DRM_DEBUG_DRIVER("Couldn't check for BIOS workaround\n");
 	} else if (IS_GEN(dev_priv, 6) && (GEN6_DECODE_RC6_VID(rc6vids & 0xff) < 450)) {
@@ -8555,7 +8556,8 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 	    IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv)) {
 		u32 params = 0;
 
-		sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, &params);
+		sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS,
+				       &params, NULL);
 		if (params & BIT(31)) { /* OC supported */
 			DRM_DEBUG_DRIVER("Overclocking supported, max: %dMHz, overclock: %dMHz\n",
 					 (rps->max_freq & 0xff) * 50,
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index 87b5a14c7ca8..a115625e980c 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -374,7 +374,7 @@ static inline int gen7_check_mailbox_status(u32 mbox)
 }
 
 static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
-				  u32 mbox, u32 *val,
+				  u32 mbox, u32 *val, u32 *val1,
 				  int fast_timeout_us,
 				  int slow_timeout_ms,
 				  bool is_read)
@@ -393,7 +393,7 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 		return -EAGAIN;
 
 	intel_uncore_write_fw(uncore, GEN6_PCODE_DATA, *val);
-	intel_uncore_write_fw(uncore, GEN6_PCODE_DATA1, 0);
+	intel_uncore_write_fw(uncore, GEN6_PCODE_DATA1, val1 ? *val1 : 0);
 	intel_uncore_write_fw(uncore,
 			      GEN6_PCODE_MAILBOX, GEN6_PCODE_READY | mbox);
 
@@ -407,6 +407,8 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 
 	if (is_read)
 		*val = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA);
+	if (is_read && val1)
+		*val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
 
 	if (INTEL_GEN(i915) > 6)
 		return gen7_check_mailbox_status(mbox);
@@ -414,12 +416,13 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 		return gen6_check_mailbox_status(mbox);
 }
 
-int sandybridge_pcode_read(struct drm_i915_private *i915, u32 mbox, u32 *val)
+int sandybridge_pcode_read(struct drm_i915_private *i915, u32 mbox,
+			   u32 *val, u32 *val1)
 {
 	int err;
 
 	mutex_lock(&i915->sb_lock);
-	err = __sandybridge_pcode_rw(i915, mbox, val,
+	err = __sandybridge_pcode_rw(i915, mbox, val, val1,
 				     500, 0,
 				     true);
 	mutex_unlock(&i915->sb_lock);
@@ -440,7 +443,7 @@ int sandybridge_pcode_write_timeout(struct drm_i915_private *i915,
 	int err;
 
 	mutex_lock(&i915->sb_lock);
-	err = __sandybridge_pcode_rw(i915, mbox, &val,
+	err = __sandybridge_pcode_rw(i915, mbox, &val, NULL,
 				     fast_timeout_us, slow_timeout_ms,
 				     false);
 	mutex_unlock(&i915->sb_lock);
@@ -457,7 +460,7 @@ static bool skl_pcode_try_request(struct drm_i915_private *i915, u32 mbox,
 				  u32 request, u32 reply_mask, u32 reply,
 				  u32 *status)
 {
-	*status = __sandybridge_pcode_rw(i915, mbox, &request,
+	*status = __sandybridge_pcode_rw(i915, mbox, &request, NULL,
 					 500, 0,
 					 true);
 
diff --git a/drivers/gpu/drm/i915/intel_sideband.h b/drivers/gpu/drm/i915/intel_sideband.h
index a0907e2c4992..7fb95745a444 100644
--- a/drivers/gpu/drm/i915/intel_sideband.h
+++ b/drivers/gpu/drm/i915/intel_sideband.h
@@ -127,7 +127,8 @@ u32 intel_sbi_read(struct drm_i915_private *i915, u16 reg,
 void intel_sbi_write(struct drm_i915_private *i915, u16 reg, u32 value,
 		     enum intel_sbi_destination destination);
 
-int sandybridge_pcode_read(struct drm_i915_private *i915, u32 mbox, u32 *val);
+int sandybridge_pcode_read(struct drm_i915_private *i915, u32 mbox,
+			   u32 *val, u32 *val1);
 int sandybridge_pcode_write_timeout(struct drm_i915_private *i915, u32 mbox,
 				    u32 val, int fast_timeout_us,
 				    int slow_timeout_ms);
-- 
2.21.0

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