On 2/17/2023 5:32 PM, Ville Syrjälä wrote:
On Fri, Feb 17, 2023 at 03:15:59PM +0530, Nautiyal, Ankit K wrote:
On 2/17/2023 4:43 AM, Ville Syrjala wrote:
From: Ville Syrjälä <ville.syrj...@linux.intel.com>
SKL/derivatives have DDI E but no AUX E, so we need to pick
another aux ch as the platform default. DDI E is more or less
the other half of DDI A, so we pick AUX A.
In all other cases we should have a corresponding aux ch for
each DDI.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_dp_aux.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c
b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index 57eb3ff187fa..96967e21c94c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -739,10 +739,20 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
cpu_latency_qos_add_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
}
+static enum aux_ch default_aux_ch(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+ /* SKL has DDI E but no AUX E */
+ if (DISPLAY_VER(i915) == 9 && encoder->port == PORT_E)
+ return AUX_CH_A;
+
I guess we might need to fix intel_dp_aux_init also. Wont we have
dig_port->aux_ch and intel_dp->aux_ch pointing to different things?
There is no intel_dp->aux_ch.
For example for SKL and DDI E, intel_dp->aux.name will be derived from
dig_port->aux_ch i.e. AUX_CH_A but intel_dp->aux_ctl/data reg will still
point to DP_AUX_CH_CTL/DATA_E.
Am I missing something?
Everything is based on dig_port->aux_ch.
Yeah my bad. I think I misread and got confused. We indeed are using
dig_port->aux_ch, for getting aux_ctl/data reg.
I couldnt get the exact bspec mention for SKL not having AUX E, but SKL
Display connection Bspec:4217 throws some light, if I am not fully off.
Is this applicable to Canonlake too (Bspec:14004) from Display
connection it does seem to have DDI E but no DP_AUX E?
Regards,
Ankit
Regards,
Ankit
+ return (enum aux_ch)encoder->port;
+}
+
enum aux_ch intel_dp_aux_ch(struct intel_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
- enum port port = encoder->port;
enum aux_ch aux_ch;
aux_ch = intel_bios_dp_aux_ch(encoder->devdata);
@@ -753,7 +763,7 @@ enum aux_ch intel_dp_aux_ch(struct intel_encoder *encoder)
return aux_ch;
}
- aux_ch = (enum aux_ch)port;
+ aux_ch = default_aux_ch(encoder);
drm_dbg_kms(&i915->drm,
"[ENCODER:%d:%s] using AUX %c (platform default)\n",
