[PATCH 2/8] drm/i915: decouple gen9 and gen10 dp signal levels.

Rodrigo Vivi
2017-08-29T23:22:36Z

Let's decouple bxt, glk and cnl dp signal levels
from other DDIs to avoid confusion.

No functional change. Only a reorg to avoid messing
with currently working DP signal levels when
moving voltage swing sequences around to match spec.

v2: ddi_signal_levels is also called from other ddi
platforms, so don't remove IS_GEN9_BC check from
skl_ddi_set_iboos. (Ville).

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 27 ++++++++++++++++++---------
drivers/gpu/drm/i915/intel_dp.c | 10 ++++------
drivers/gpu/drm/i915/intel_drv.h | 1 +
3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 7e875e05d053..9a887780f99f 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2063,23 +2063,32 @@ static uint32_t intel_ddi_dp_level(struct intel_dp *intel_dp)
return translate_signal_level(signal_levels);
}

-uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
+u32 bxt_signal_levels(struct intel_dp *intel_dp)
{
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dport->base.base.dev);
struct intel_encoder *encoder = &dport->base;
enum port port = dport->port;
+ u32 level = intel_ddi_dp_level(intel_dp);
+
+ if (IS_CANNONLAKE(dev_priv))
+ cnl_ddi_vswing_sequence(encoder, level);
+ else
+ bxt_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
+
+ return 0;
+}
+
+uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
+ struct drm_i915_private *dev_priv = to_i915(dport->base.base.dev);
+ struct intel_encoder *encoder = &dport->base;
uint32_t level = intel_ddi_dp_level(intel_dp);

if (IS_GEN9_BC(dev_priv))
- skl_ddi_set_iboost(encoder, level);
- else if (IS_GEN9_LP(dev_priv))
- bxt_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
- else if (IS_CANNONLAKE(dev_priv)) {
- cnl_ddi_vswing_sequence(encoder, level);
- /* DDI_BUF_CTL bits 27:24 are reserved on CNL */
- return 0;
- }
+ skl_ddi_set_iboost(encoder, level);
+
return DDI_BUF_TRANS_SELECT(level);
}

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d3e5fdf0d2fa..49a8c339b2b0 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3506,13 +3506,11 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp)
uint32_t signal_levels, mask = 0;
uint8_t train_set = intel_dp->train_set[0];

- if (HAS_DDI(dev_priv)) {
+ if (IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv)) {
+ signal_levels = bxt_signal_levels(intel_dp);
+ } else if (HAS_DDI(dev_priv)) {
signal_levels = ddi_signal_levels(intel_dp);
-
- if (IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv))
- signal_levels = 0;
- else
- mask = DDI_BUF_EMP_MASK;
+ mask = DDI_BUF_EMP_MASK;
} else if (IS_CHERRYVIEW(dev_priv)) {
signal_levels = chv_signal_levels(intel_dp);
} else if (IS_VALLEYVIEW(dev_priv)) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 17649f13091c..469c06000774 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1271,6 +1271,7 @@ void intel_ddi_clock_get(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config);
void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
bool state);
+u32 bxt_signal_levels(struct intel_dp *intel_dp);
uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);

--
2.13.2