From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
AFAIK CHV was supposed to have HBR2 originally, but in the end the feature
was dropped. We still have some code leftovers from those early days.
Eliminate them.
The extra bit for the training pattern seems to be dead in the hardware.
I can set it (in fact I can set almost any reserved bit in the
registers) but it doesn't seem to interfere with the operation of the
hardware. Either that or I'm very lucky that my displays complete link
training with the incorrect pattern being sent out.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 2 --
drivers/gpu/drm/i915/intel_dp.c | 20 ++++----------------
2 files changed, 4 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 95a2e51ecbb0..f3efc242df2d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5250,8 +5250,6 @@ enum {
#define DP_LINK_TRAIN_OFF (3 << 28)
#define DP_LINK_TRAIN_MASK (3 << 28)
#define DP_LINK_TRAIN_SHIFT 28
-#define DP_LINK_TRAIN_PAT_3_CHV (1 << 14)
-#define DP_LINK_TRAIN_MASK_CHV ((3 << 28)|(1<<14))
/* CPT Link training mode */
#define DP_LINK_TRAIN_PAT_1_CPT (0 << 8)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index aba2f45819d8..df1772044208 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -92,8 +92,6 @@ static const struct dp_link_dpll chv_dpll[] = {
{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
{ 270000, /* m2_int = 27, m2_fraction = 0 */
{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
- { 540000, /* m2_int = 27, m2_fraction = 0 */
- { .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
};
/**
@@ -2908,10 +2906,7 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp,
}
} else {
- if (IS_CHERRYVIEW(dev_priv))
- *DP &= ~DP_LINK_TRAIN_MASK_CHV;
- else
- *DP &= ~DP_LINK_TRAIN_MASK;
+ *DP &= ~DP_LINK_TRAIN_MASK;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
@@ -2924,12 +2919,8 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp,
*DP |= DP_LINK_TRAIN_PAT_2;
break;
case DP_TRAINING_PATTERN_3:
- if (IS_CHERRYVIEW(dev_priv)) {
- *DP |= DP_LINK_TRAIN_PAT_3_CHV;
- } else {
- DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n");
- *DP |= DP_LINK_TRAIN_PAT_2;
- }
+ DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n");
+ *DP |= DP_LINK_TRAIN_PAT_2;
break;
}
}
@@ -3668,10 +3659,7 @@ intel_dp_link_down(struct intel_encoder *encoder,
DP &= ~DP_LINK_TRAIN_MASK_CPT;
DP |= DP_LINK_TRAIN_PAT_IDLE_CPT;
} else {
- if (IS_CHERRYVIEW(dev_priv))
- DP &= ~DP_LINK_TRAIN_MASK_CHV;
- else
- DP &= ~DP_LINK_TRAIN_MASK;
+ DP &= ~DP_LINK_TRAIN_MASK;
DP |= DP_LINK_TRAIN_PAT_IDLE;
}
I915_WRITE(intel_dp->output_reg, DP);
--
2.13.6
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
