[Intel-gfx] [PATCH 1/3] drm/i915: Disable M2 frac division for integer case

[Vijay Purushothaman]

v2 : Handle M2 frac division for both M2 frac and int cases

v3 : Addressed Ville's review comments. Cleared the old bits for RMW

Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |    1 +
 drivers/gpu/drm/i915/intel_display.c |   24 ++++++++++++++++++------
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 55143cb..8200e98 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1029,6 +1029,7 @@ enum skl_disp_power_wells {
 #define  DPIO_CHV_FIRST_MOD		(0 << 8)
 #define  DPIO_CHV_SECOND_MOD		(1 << 8)
 #define  DPIO_CHV_FEEDFWD_GAIN_SHIFT	0
+#define  DPIO_CHV_FEEDFWD_GAIN_MASK		(0xF << 0)
 #define CHV_PLL_DW3(ch) _PIPE(ch, _CHV_PLL_DW3_CH0, _CHV_PLL_DW3_CH1)
 
 #define _CHV_PLL_DW6_CH0		0x8018
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7298796..15904a8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6131,6 +6131,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
 	enum dpio_channel port = vlv_pipe_to_channel(pipe);
 	u32 loopfilter, intcoeff;
 	u32 bestn, bestm1, bestm2, bestp1, bestp2, bestm2_frac;
+	u32 dpio_val;
 	int refclk;
 
 	bestn = pipe_config->dpll.n;
@@ -6139,6 +6140,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
 	bestm2 = pipe_config->dpll.m2 >> 22;
 	bestp1 = pipe_config->dpll.p1;
 	bestp2 = pipe_config->dpll.p2;
+	dpio_val = 0;
 
 	/*
 	 * Enable Refclk and SSC
@@ -6163,13 +6165,23 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
 			DPIO_CHV_M1_DIV_BY_2 |
 			1 << DPIO_CHV_N_DIV_SHIFT);
 
-	/* M2 fraction division */
-	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);
+	if (bestm2_frac) {
+		/* M2 fraction division */
+		vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);
 
-	/* M2 fraction division enable */
-	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port),
-		       DPIO_CHV_FRAC_DIV_EN |
-		       (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT));
+		/* M2 fraction division enable */
+		dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
+		dpio_val |= DPIO_CHV_FRAC_DIV_EN;
+		dpio_val &= ~DPIO_CHV_FEEDFWD_GAIN_MASK;
+		dpio_val |= (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT);
+		vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);
+
+	} else {
+		/* M2 fraction division disable */
+		dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
+		dpio_val &= ~DPIO_CHV_FRAC_DIV_EN;
+		vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);
+	}
 
 	/* Loop filter */
 	refclk = i9xx_get_refclk(crtc, 0);
-- 
1.7.9.5