Hey Chris,
I added comments for both Ville and you, please help me to understand this.
Regards
Shashank
On 3/17/2016 9:51 PM, Ville Syrjälä wrote:
On Thu, Mar 17, 2016 at 09:35:30PM +0530, Sharma, Shashank wrote:
Regards
Shashank
On 3/17/2016 9:31 PM, Ville Syrjälä wrote:
On Thu, Mar 17, 2016 at 09:15:39PM +0530, Sharma, Shashank wrote:
Regards
Shashank
On 3/17/2016 6:34 PM, Ville Syrjälä wrote:
On Thu, Mar 17, 2016 at 01:29:25PM +0530, Shashank Sharma wrote:
This patch restricts usage of live status check for HDMI detection.
While testing certain (monitor + cable) combinations with various
intel platforms, it seems that live status register is not reliable
on some older devices. So limit the live_status check from VLV onwards.
This fixes a regression introduced in:
commit: 237ed86 "drm/i915: Check live status"
Author: Sonika Jindal <sonika.jin...@intel.com>
Date: Tue Sep 15 09:44:20 2015 +0530
Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
---
drivers/gpu/drm/i915/intel_hdmi.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
b/drivers/gpu/drm/i915/intel_hdmi.c
index e2dab48..d24d18a 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1397,7 +1397,8 @@ intel_hdmi_detect(struct drm_connector *connector, bool
force)
enum drm_connector_status status;
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
struct drm_i915_private *dev_priv = to_i915(connector->dev);
- bool live_status = false;
+ struct drm_device *dev = connector->dev;
+ bool live_status = true;
unsigned int try;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
@@ -1405,16 +1406,21 @@ intel_hdmi_detect(struct drm_connector *connector, bool
force)
intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
- for (try = 0; !live_status && try < 9; try++) {
- if (try)
- msleep(10);
- live_status = intel_digital_port_connected(dev_priv,
+ /*
+ * Live status check for HDMI detection is not very
+ * reliable on older platforms. So insist the live
+ * status check for EDID read from VLV onwards.
+ */
+ if (INTEL_INFO(dev)->gen >= 7 && !IS_IVYBRIDGE(dev)) {
+ for (try = 0; !live_status && try < 9; try++) {
+ if (try)
+ msleep(10);
+ live_status = intel_digital_port_connected(dev_priv,
hdmi_to_dig_port(intel_hdmi));
+ }
+ DRM_DEBUG_KMS("Live status %s\n", live_status ? "up" : "down");
}
- if (!live_status)
- DRM_DEBUG_KMS("Live status not up!");
-
As I said before, I think this whole thing could be solved with a simple
two-liner here:
+ if (...)
+ live_status = true;
Yes I remember, and I replied on that already that why we would like to
keep the live status check. In fact I would be ok to remove this check
if you can suggest some other way of making this work for other
operating systems/sw platforms.
My two liner would keep the check.
Sorry, I might have not understood you properly.
Do you mean:
if (INTEL_INFO(dev)->gen < 7 && IS_IVYBRIDGE(dev)) {
live_status = true;
} else {
do the same looping for retry;
}
No, I mean
{
...
do loop;
if (!live_status)
DRM_DEBUG_KMS("Live status not up!");
+ if (don't trust live status)
+ live_status = true;
intel_hdmi_unset_edid();
if (intel_hdmi_set_edid(live_status)) {
...
}
In fact, this is what I have done.
If you see the change in this patch,
/* Lets make live status true for < VLV platforms */
bool live_status = true;
blah....
blah....
/* Check live status only for newer platforms */
if (this is VLV or later platforms) {
live_status = read_real_live_status();
}
intel_hdmi_unset_edid();
intel_hdmi_set_edid(live_status);
Now, my question is, do you want to remove live_status check for VLV and
other platforms too ? or this is good enough ?
intel_hdmi_unset_edid(connector);
if (intel_hdmi_set_edid(connector, live_status)) {
--
1.9.1
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