From: koushik <koushikx.biswas@xxxxxxxxx>
WW43 2012 - DDI buffer translation corrections
WW36 2012 - Added HDMI voltage swing (not implemented
for HDMI)
Added comments with voltage swing, pre-emphasis,
transition and non-transition values in form of table
for reference. This values are applicable only for HSW
platform.
Signed-off-by: koushik <koushikx.biswas@xxxxxxxxx>
Change-Id: I0cff220c7d047f41b2a96b3e3880b4029550d458
---
drivers/gpu/drm/i915/intel_ddi.c | 31 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dp.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 5131517..0de236e 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -128,6 +128,37 @@ void intel_prepare_ddi(struct drm_device *dev)
intel_prepare_ddi_buffers(dev, PORT_E, true);
}
+
+/* Updating the new table in comments as it doesn’t cause any logic change */
+
+/************* For HSW Voltage swing levels ***************************/
+/**********************************************************************/
+/*____________________________________________________________________*/
+/*|Entry|Voltage|Pre-emphasis|Non-Transition|Transition |Pre-emphasis|*/
+/*| |Swing |level |mV diff p-p |mV diff p-p|db |*/
+/*|------------------------------------------------------------------|*/
+/*|0 |0 |0 |400 |400 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|1 |0 |1 |400 |600 |3.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|2 |0 |2 |400 |800 |6 |*/
+/*|------------------------------------------------------------------|*/
+/*|3 |0 |3 |400 |1000 |8 |*/
+/*|------------------------------------------------------------------|*/
+/*|4 |1 |0 |600 |600 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|5 |1 |1 |600 |900 |3.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|6 |1 |2 |600 |1000 |4.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|7 |2 |0 |800 |800 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|8 |2 |1 |1000 |1000 |2 |*/
+/*|------------------------------------------------------------------|*/
+/*|9 | Entry 9 is only used for HDMI and DVI |*/
+/*|------------------------------------------------------------------|*/
+/**********************************************************************/
+
static const long hsw_ddi_buf_ctl_values[] = {
DDI_BUF_EMP_400MV_0DB_HSW,
DDI_BUF_EMP_400MV_3_5DB_HSW,
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 9fd7f90..fa73fb1 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1809,6 +1809,38 @@ intel_gen7_edp_signal_levels(uint8_t train_set)
}
}
+
+/* Updating the new table in comments as it doesn’t cause any logic change */
+
+/************* For HSW Voltage swing levels ***************************/
+/**********************************************************************/
+/*____________________________________________________________________*/
+/*|Entry|Voltage|Pre-emphasis|Non-Transition|Transition |Pre-emphasis|*/
+/*| |Swing |level |mV diff p-p |mV diff p-p|db |*/
+/*|------------------------------------------------------------------|*/
+/*|0 |0 |0 |400 |400 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|1 |0 |1 |400 |600 |3.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|2 |0 |2 |400 |800 |6 |*/
+/*|------------------------------------------------------------------|*/
+/*|3 |0 |3 |400 |1000 |8 |*/
+/*|------------------------------------------------------------------|*/
+/*|4 |1 |0 |600 |600 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|5 |1 |1 |600 |900 |3.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|6 |1 |2 |600 |1000 |4.5 |*/
+/*|------------------------------------------------------------------|*/
+/*|7 |2 |0 |800 |800 |0 |*/
+/*|------------------------------------------------------------------|*/
+/*|8 |2 |1 |1000 |1000 |2 |*/
+/*|------------------------------------------------------------------|*/
+/*|9 | Entry 9 is only used for HDMI and DVI |*/
+/*|------------------------------------------------------------------|*/
+/**********************************************************************/
+
+
/* Gen7.5's (HSW) DP voltage swing and pre-emphasis control */
static uint32_t
intel_hsw_signal_levels(uint8_t train_set)
--
1.7.9.5
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