On 3/3/2015 9:08 PM, Ville Syrjälä wrote:
On Tue, Mar 03, 2015 at 08:43:12PM +0530, Vijay Purushothaman wrote:
Initialize lock detect threshold and select coarse threshold for the
case where M2 fraction division is disabled.
v2: Split the changes into multiple smaller patches based on review by
Ville
v3: Addressed rest of the review comments. Clear out the old bits before
we modify those bits as part of RMW
Signed-off-by: Vijay Purushothaman <vijay.a.purushotha...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8200e98..1a0f94e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1046,6 +1046,7 @@ enum skl_disp_power_wells {
#define _CHV_PLL_DW9_CH0 0x8024
#define _CHV_PLL_DW9_CH1 0x81A4
#define DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT 1 /* 3 bits */
+#define DPIO_CHV_INT_LOCK_THRESHOLD_MASK (7 << 1)
#define DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE 1 /* 1: coarse & 0 :
fine */
#define CHV_PLL_DW9(ch) _PIPE(ch, _CHV_PLL_DW9_CH0, _CHV_PLL_DW9_CH1)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 15904a8..a6b5786 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6176,11 +6176,24 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
dpio_val |= (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT);
vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);
+ /* Program digital lock detect threshold */
+ dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW9(port));
+ dpio_val &= ~DPIO_CHV_INT_LOCK_THRESHOLD_MASK;
+ dpio_val |= (0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT);
Missing
dpio_val &= ~DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
here.
So I think to avoid such mistakes it's best to rewrite this too as:
val = read(PLL_DW9)
val &= ~(DPIO_CHV_INT_LOCK_THRESHOLD_MASK |
DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE);
val |= 0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT)
if (!bestm2_frac)
val |= DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
write(PLL_DW9, val);
I will send v4 with this change and add your signed-off-by tag.
Thanks,
Vijay
+ vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW9(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);
+
+ /* Program digital lock detect threshold */
+ dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW9(port));
+ dpio_val &= ~DPIO_CHV_INT_LOCK_THRESHOLD_MASK;
+ dpio_val |= (0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT);
+ dpio_val |= DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
+ vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW9(port), dpio_val);
}
/* Loop filter */
--
1.7.9.5
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