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From: Imre Deak <imre.deak@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH] drm/i915: Add tracking for CDCLK bypass frequency
Date: Wed, 17 Jan 2018 19:25:08 +0200	[thread overview]
Message-ID: <20180117172508.15993-1-imre.deak@intel.com> (raw)

The CDCLK bypass frequency can vary on upcoming platforms, so prepare
for that now by tracking its value in the CDCLK state.

Currently on BDW+ the bypass frequency is always the reference clock and
I didn't bother with earlier platforms since it's not all that clear
what's the bypass clock on those.

I also didn't bother adding support for changing this frequency, since
atm I don't see any need for it.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h    |  2 +-
 drivers/gpu/drm/i915/intel_cdclk.c | 35 ++++++++++++++++++-----------------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c42015b05b47..49ccfc397feb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1791,7 +1791,7 @@ struct i915_oa_ops {
 };
 
 struct intel_cdclk_state {
-	unsigned int cdclk, vco, ref;
+	unsigned int cdclk, vco, ref, bypass;
 	u8 voltage_level;
 };
 
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index ca36321eafac..f46a61d423a1 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -858,7 +858,7 @@ static void skl_get_cdclk(struct drm_i915_private *dev_priv,
 
 	skl_dpll0_update(dev_priv, cdclk_state);
 
-	cdclk_state->cdclk = cdclk_state->ref;
+	cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
 
 	if (cdclk_state->vco == 0)
 		goto out;
@@ -1006,7 +1006,7 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 	/* Choose frequency for this cdclk */
 	switch (cdclk) {
 	default:
-		WARN_ON(cdclk != dev_priv->cdclk.hw.ref);
+		WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
 		WARN_ON(vco != 0);
 		/* fall through */
 	case 308571:
@@ -1085,7 +1085,7 @@ static void skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
 
 	/* Is PLL enabled and locked ? */
 	if (dev_priv->cdclk.hw.vco == 0 ||
-	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
+	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
 		goto sanitize;
 
 	/* DPLL okay; verify the cdclock
@@ -1159,7 +1159,7 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
 {
 	struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
 
-	cdclk_state.cdclk = cdclk_state.ref;
+	cdclk_state.cdclk = cdclk_state.bypass;
 	cdclk_state.vco = 0;
 	cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
 
@@ -1199,7 +1199,7 @@ static int bxt_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
 {
 	int ratio;
 
-	if (cdclk == dev_priv->cdclk.hw.ref)
+	if (cdclk == dev_priv->cdclk.hw.bypass)
 		return 0;
 
 	switch (cdclk) {
@@ -1224,7 +1224,7 @@ static int glk_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
 {
 	int ratio;
 
-	if (cdclk == dev_priv->cdclk.hw.ref)
+	if (cdclk == dev_priv->cdclk.hw.bypass)
 		return 0;
 
 	switch (cdclk) {
@@ -1268,7 +1268,7 @@ static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
 
 	bxt_de_pll_update(dev_priv, cdclk_state);
 
-	cdclk_state->cdclk = cdclk_state->ref;
+	cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
 
 	if (cdclk_state->vco == 0)
 		goto out;
@@ -1352,7 +1352,7 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	/* cdclk = vco / 2 / div{1,1.5,2,4} */
 	switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
 	default:
-		WARN_ON(cdclk != dev_priv->cdclk.hw.ref);
+		WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
 		WARN_ON(vco != 0);
 		/* fall through */
 	case 2:
@@ -1425,7 +1425,7 @@ static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
 	intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
 
 	if (dev_priv->cdclk.hw.vco == 0 ||
-	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
+	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
 		goto sanitize;
 
 	/* DPLL okay; verify the cdclock
@@ -1514,7 +1514,7 @@ void bxt_uninit_cdclk(struct drm_i915_private *dev_priv)
 {
 	struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
 
-	cdclk_state.cdclk = cdclk_state.ref;
+	cdclk_state.cdclk = cdclk_state.bypass;
 	cdclk_state.vco = 0;
 	cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
 
@@ -1574,7 +1574,7 @@ static void cnl_get_cdclk(struct drm_i915_private *dev_priv,
 
 	cnl_cdclk_pll_update(dev_priv, cdclk_state);
 
-	cdclk_state->cdclk = cdclk_state->ref;
+	cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
 
 	if (cdclk_state->vco == 0)
 		goto out;
@@ -1660,7 +1660,7 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
 	/* cdclk = vco / 2 / div{1,2} */
 	switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
 	default:
-		WARN_ON(cdclk != dev_priv->cdclk.hw.ref);
+		WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
 		WARN_ON(vco != 0);
 		/* fall through */
 	case 2:
@@ -1705,7 +1705,7 @@ static int cnl_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
 {
 	int ratio;
 
-	if (cdclk == dev_priv->cdclk.hw.ref)
+	if (cdclk == dev_priv->cdclk.hw.bypass)
 		return 0;
 
 	switch (cdclk) {
@@ -1732,7 +1732,7 @@ static void cnl_sanitize_cdclk(struct drm_i915_private *dev_priv)
 	intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
 
 	if (dev_priv->cdclk.hw.vco == 0 ||
-	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
+	    dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
 		goto sanitize;
 
 	/* DPLL okay; verify the cdclock
@@ -1805,7 +1805,7 @@ void cnl_uninit_cdclk(struct drm_i915_private *dev_priv)
 {
 	struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
 
-	cdclk_state.cdclk = cdclk_state.ref;
+	cdclk_state.cdclk = cdclk_state.bypass;
 	cdclk_state.vco = 0;
 	cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
 
@@ -1846,9 +1846,10 @@ bool intel_cdclk_changed(const struct intel_cdclk_state *a,
 void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
 			    const char *context)
 {
-	DRM_DEBUG_DRIVER("%s %d kHz, VCO %d kHz, ref %d kHz, voltage level %d\n",
+	DRM_DEBUG_DRIVER("%s %d kHz, VCO %d kHz, ref %d kHz, bypass %d kHz, voltage level %d\n",
 			 context, cdclk_state->cdclk, cdclk_state->vco,
-			 cdclk_state->ref, cdclk_state->voltage_level);
+			 cdclk_state->ref, cdclk_state->bypass,
+			 cdclk_state->voltage_level);
 }
 
 /**
-- 
2.13.2

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             reply	other threads:[~2018-01-17 17:25 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-17 17:25 Imre Deak [this message]
2018-01-17 17:56 ` [PATCH] drm/i915: Add tracking for CDCLK bypass frequency Ville Syrjälä
2018-01-18 14:21   ` Imre Deak
2018-01-17 18:11 ` ✓ Fi.CI.BAT: success for " Patchwork
2018-01-17 19:54 ` ✗ Fi.CI.IGT: warning " Patchwork

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