Re: [PATCH 04/30] drm/i915/display: remove explicit CNL handling from intel_cdclk.c

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On Sat, Jul 24, 2021 at 11:12:07AM -0700, Matt Roper wrote:

On Fri, Jul 23, 2021 at 05:10:48PM -0700, Lucas De Marchi wrote:

The only real platform with DISPLAY_VER == 10 is GLK, so we don't need
any checks and supporting code for CNL. Remove code and rename
functions/macros accordingly.

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c | 72 +++++-----------------
 drivers/gpu/drm/i915/i915_reg.h            |  4 +-
 2 files changed, 18 insertions(+), 58 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index ff35c29508d5..34fa4130d5c4 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1195,17 +1195,6 @@ static const struct intel_cdclk_vals glk_cdclk_table[] = {
 	{}
 };

-static const struct intel_cdclk_vals cnl_cdclk_table[] = {
-	{ .refclk = 19200, .cdclk = 168000, .divider = 4, .ratio = 35 },
-	{ .refclk = 19200, .cdclk = 336000, .divider = 2, .ratio = 35 },
-	{ .refclk = 19200, .cdclk = 528000, .divider = 2, .ratio = 55 },
-
-	{ .refclk = 24000, .cdclk = 168000, .divider = 4, .ratio = 28 },
-	{ .refclk = 24000, .cdclk = 336000, .divider = 2, .ratio = 28 },
-	{ .refclk = 24000, .cdclk = 528000, .divider = 2, .ratio = 44 },
-	{}
-};
-
 static const struct intel_cdclk_vals icl_cdclk_table[] = {
 	{ .refclk = 19200, .cdclk = 172800, .divider = 2, .ratio = 18 },
 	{ .refclk = 19200, .cdclk = 192000, .divider = 2, .ratio = 20 },
@@ -1339,16 +1328,6 @@ static u8 bxt_calc_voltage_level(int cdclk)
 	return DIV_ROUND_UP(cdclk, 25000);
 }

-static u8 cnl_calc_voltage_level(int cdclk)
-{
-	if (cdclk > 336000)
-		return 2;
-	else if (cdclk > 168000)
-		return 1;
-	else
-		return 0;
-}
-
 static u8 icl_calc_voltage_level(int cdclk)
 {
 	if (cdclk > 556800)
@@ -1383,15 +1362,6 @@ static u8 tgl_calc_voltage_level(int cdclk)
 		return 0;
 }

-static void cnl_readout_refclk(struct drm_i915_private *dev_priv,
-			       struct intel_cdclk_config *cdclk_config)
-{
-	if (intel_de_read(dev_priv, SKL_DSSM) & CNL_DSSM_CDCLK_PLL_REFCLK_24MHz)
-		cdclk_config->ref = 24000;
-	else
-		cdclk_config->ref = 19200;
-}
-
 static void icl_readout_refclk(struct drm_i915_private *dev_priv,
 			       struct intel_cdclk_config *cdclk_config)
 {
@@ -1422,8 +1392,6 @@ static void bxt_de_pll_readout(struct drm_i915_private *dev_priv,
 		cdclk_config->ref = 38400;
 	else if (DISPLAY_VER(dev_priv) >= 11)
 		icl_readout_refclk(dev_priv, cdclk_config);
-	else if (IS_CANNONLAKE(dev_priv))
-		cnl_readout_refclk(dev_priv, cdclk_config);
 	else
 		cdclk_config->ref = 19200;

@@ -1439,11 +1407,11 @@ static void bxt_de_pll_readout(struct drm_i915_private *dev_priv,
 	}

 	/*
-	 * CNL+ have the ratio directly in the PLL enable register, gen9lp had
-	 * it in a separate PLL control register.
+	 * DISPLAY_VER >= 11 have the ratio directly in the PLL enable register,
+	 * gen9lp had it in a separate PLL control register.
 	 */
-	if (DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv))
-		ratio = val & CNL_CDCLK_PLL_RATIO_MASK;
+	if (DISPLAY_VER(dev_priv) >= 11)
+		ratio = val & ICL_CDCLK_PLL_RATIO_MASK;
 	else
 		ratio = intel_de_read(dev_priv, BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;

@@ -1530,7 +1498,7 @@ static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, int vco)
 	dev_priv->cdclk.hw.vco = vco;
 }

-static void cnl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
+static void icl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
 {
 	intel_de_rmw(dev_priv, BXT_DE_PLL_ENABLE,
 		     BXT_DE_PLL_PLL_ENABLE, 0);
@@ -1542,12 +1510,12 @@ static void cnl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
 	dev_priv->cdclk.hw.vco = 0;
 }

-static void cnl_cdclk_pll_enable(struct drm_i915_private *dev_priv, int vco)
+static void icl_cdclk_pll_enable(struct drm_i915_private *dev_priv, int vco)
 {
 	int ratio = DIV_ROUND_CLOSEST(vco, dev_priv->cdclk.hw.ref);
 	u32 val;

-	val = CNL_CDCLK_PLL_RATIO(ratio);
+	val = ICL_CDCLK_PLL_RATIO(ratio);
 	intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);

 	val |= BXT_DE_PLL_PLL_ENABLE;
@@ -1566,7 +1534,7 @@ static void adlp_cdclk_pll_crawl(struct drm_i915_private *dev_priv, int vco)
 	u32 val;

 	/* Write PLL ratio without disabling */
-	val = CNL_CDCLK_PLL_RATIO(ratio) | BXT_DE_PLL_PLL_ENABLE;
+	val = ICL_CDCLK_PLL_RATIO(ratio) | BXT_DE_PLL_PLL_ENABLE;
 	intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);

 	/* Submit freq change request */
@@ -1635,7 +1603,7 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	int ret;

 	/* Inform power controller of upcoming frequency change. */
-	if (DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv))
+	if (DISPLAY_VER(dev_priv) >= 11)
 		ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 					SKL_CDCLK_PREPARE_FOR_CHANGE,
 					SKL_CDCLK_READY_FOR_CHANGE,
@@ -1659,13 +1627,13 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->cdclk.hw.vco > 0 && vco > 0) {
 		if (dev_priv->cdclk.hw.vco != vco)
 			adlp_cdclk_pll_crawl(dev_priv, vco);
-	} else if (DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv)) {
+	} else if (DISPLAY_VER(dev_priv) >= 11) {
 		if (dev_priv->cdclk.hw.vco != 0 &&
 		    dev_priv->cdclk.hw.vco != vco)
-			cnl_cdclk_pll_disable(dev_priv);
+			icl_cdclk_pll_disable(dev_priv);

 		if (dev_priv->cdclk.hw.vco != vco)
-			cnl_cdclk_pll_enable(dev_priv, vco);
+			icl_cdclk_pll_enable(dev_priv, vco);
 	} else {
 		if (dev_priv->cdclk.hw.vco != 0 &&
 		    dev_priv->cdclk.hw.vco != vco)
@@ -1691,7 +1659,7 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	if (pipe != INVALID_PIPE)
 		intel_wait_for_vblank(dev_priv, pipe);

-	if (DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv)) {
+	if (DISPLAY_VER(dev_priv) >= 11) {
 		ret = sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 					      cdclk_config->voltage_level);
 	} else {
@@ -1716,7 +1684,7 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,

 	intel_update_cdclk(dev_priv);

-	if (DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv))
+	if (DISPLAY_VER(dev_priv) >= 11)
 		/*
 		 * Can't read out the voltage level :(
 		 * Let's just assume everything is as expected.
@@ -2125,7 +2093,7 @@ int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
 	    crtc_state->port_clock >= 540000 &&
 	    crtc_state->lane_count == 4) {
 		if (DISPLAY_VER(dev_priv) == 10) {
-			/* Display WA #1145: glk,cnl */
+			/* Display WA #1145: glk */
 			min_cdclk = max(316800, min_cdclk);
 		} else if (DISPLAY_VER(dev_priv) == 9 || IS_BROADWELL(dev_priv)) {
 			/* Display WA #1144: skl,bxt */
@@ -2246,7 +2214,7 @@ static int intel_compute_min_cdclk(struct intel_cdclk_state *cdclk_state)

 /*
  * Account for port clock min voltage level requirements.
- * This only really does something on CNL+ but can be
+ * This only really does something on DISPLA_VER >= 11 but can be
  * called on earlier platforms as well.
  *
  * Note that this functions assumes that 0 is
@@ -2660,8 +2628,6 @@ void intel_update_max_cdclk(struct drm_i915_private *dev_priv)
 			dev_priv->max_cdclk_freq = 648000;
 		else
 			dev_priv->max_cdclk_freq = 652800;
-	} else if (IS_CANNONLAKE(dev_priv)) {
-		dev_priv->max_cdclk_freq = 528000;
 	} else if (IS_GEMINILAKE(dev_priv)) {
 		dev_priv->max_cdclk_freq = 316800;
 	} else if (IS_BROXTON(dev_priv)) {
@@ -2925,12 +2891,6 @@ void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
 		dev_priv->display.modeset_calc_cdclk = bxt_modeset_calc_cdclk;
 		dev_priv->display.calc_voltage_level = icl_calc_voltage_level;
 		dev_priv->cdclk.table = icl_cdclk_table;
-	} else if (IS_CANNONLAKE(dev_priv)) {
-		dev_priv->display.bw_calc_min_cdclk = skl_bw_calc_min_cdclk;
-		dev_priv->display.set_cdclk = bxt_set_cdclk;
-		dev_priv->display.modeset_calc_cdclk = bxt_modeset_calc_cdclk;
-		dev_priv->display.calc_voltage_level = cnl_calc_voltage_level;
-		dev_priv->cdclk.table = cnl_cdclk_table;
 	} else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
 		dev_priv->display.bw_calc_min_cdclk = skl_bw_calc_min_cdclk;
 		dev_priv->display.set_cdclk = bxt_set_cdclk;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8e1392028184..6a894ffd91e1 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -11016,8 +11016,8 @@ enum skl_power_gate {
 #define   BXT_DE_PLL_LOCK		(1 << 30)
 #define   BXT_DE_PLL_FREQ_REQ		(1 << 23)
 #define   BXT_DE_PLL_FREQ_REQ_ACK	(1 << 22)
-#define   CNL_CDCLK_PLL_RATIO(x)	(x)
-#define   CNL_CDCLK_PLL_RATIO_MASK	0xff
+#define   ICL_CDCLK_PLL_RATIO(x)	(x)
+#define   ICL_CDCLK_PLL_RATIO_MASK	0xff


We could take this opportunity to switch to REG_GENMASK, REG_FIELD_PREP
here.  Otherwise,

Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>


I'd rather have a single big patch converting all of i915_reg.h

We are doing this conversion piece by piece for a long time and it seems
we are never going to achieve the desired end result.

todo++

thanks
Lucas De Marchi





 /* GEN9 DC */
 #define DC_STATE_EN			_MMIO(0x45504)
--
2.31.1



--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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