Follow the PLL enable sequence updated in bspec, which requires the DCC
delay range 2 bit to be set.
v2: Moved from DDI init sequence to PLL enable.
v3: Don't read value from GRP register. (Rodrido)
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Signed-off-by: Ander Conselvan De Oliveira
<ander.conselvan.de.olive...@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 15 +++++++++++++++
drivers/gpu/drm/i915/intel_dpll_mgr.c | 6 ++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d1f0720..6cff01d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1784,6 +1784,21 @@ enum skl_disp_power_wells {
#define DEEMPH_SHIFT 24
#define DE_EMPHASIS (0xFF << DEEMPH_SHIFT)
+#define _PORT_TX_DW5_LN0_A 0x162514
+#define _PORT_TX_DW5_LN0_B 0x6C514
+#define _PORT_TX_DW5_LN0_C 0x6C914
+#define _PORT_TX_DW5_GRP_A 0x162D14
+#define _PORT_TX_DW5_GRP_B 0x6CD14
+#define _PORT_TX_DW5_GRP_C 0x6CF14
+#define BXT_PORT_TX_DW5_LN0(phy, ch) _MMIO_BXT_PHY_CH(phy, ch, \
+ _PORT_TX_DW5_LN0_B, \
+ _PORT_TX_DW5_LN0_C)
+#define BXT_PORT_TX_DW5_GRP(phy, ch) _MMIO_BXT_PHY_CH(phy, ch, \
+ _PORT_TX_DW5_GRP_B, \
+ _PORT_TX_DW5_GRP_C)
+#define DCC_DELAY_RANGE_1 (1 << 9)
+#define DCC_DELAY_RANGE_2 (1 << 8)
+
#define _PORT_TX_DW14_LN0_A 0x162538
#define _PORT_TX_DW14_LN0_B 0x6C538
#define _PORT_TX_DW14_LN0_C 0x6C938
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c
b/drivers/gpu/drm/i915/intel_dpll_mgr.c
index 8a82507..63104b7 100644
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
@@ -1458,6 +1458,12 @@ static void bxt_ddi_pll_enable(struct drm_i915_private
*dev_priv,
200))
DRM_ERROR("PLL %d not locked\n", port);
+ if (IS_GEMINILAKE(dev_priv)) {
+ temp = I915_READ(BXT_PORT_TX_DW5_LN0(phy, ch));
+ temp |= DCC_DELAY_RANGE_2;
+ I915_WRITE(BXT_PORT_TX_DW5_GRP(phy, ch), temp);
+ }
+
/*
* While we write to the group register to program all lanes at once we
* can read only lane registers and we pick lanes 0/1 for that.
--
2.5.5
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