Re: [PATCH 4/5] drm/i915: Check live status before reading edid

["Jindal, Sonika" <sonika.jindal@intel.com>]

On 7/9/2015 10:57 PM, Daniel Vetter wrote:
> On Thu, Jul 09, 2015 at 05:34:29PM +0530, Sonika Jindal wrote:
>> Adding this for SKL onwards.
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>
> I think this is the critical piece really, and I'd like to roll it out for
> all platforms. git has the code for all the old ones, so no big deal to
> digg that out. Also we need your fix for the interrupt handling first ofc,
> otherwise this won't work.
>
We have tested this with VLV/CHV too, and it works fine. I'l add those 
platforms also in the next version of this patch and change the gen 
check in the next patch as well.

> Then we can apply this and give it some good testing before we start
> relying on it with caching hdmi probe status. I know this means that
> things will be slower, but I've been burned a bit too much the last few
> times we've tried this. And I really think we need the most amount of
> testing we can get (hence rolling this out for all platforms). If your
> hpd irq handling bugfix is indeed the bug that will be confirmed quickly,
> otherwise it means back to debugging.
>
>> ---
>>   drivers/gpu/drm/i915/intel_hdmi.c |   49 ++++++++++++++++++++++++++++++++++---
>>   1 file changed, 45 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>> index 1fb6919..769cf4f 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -1300,6 +1300,46 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
>>   	to_intel_connector(connector)->detect_edid = NULL;
>>   }
>>
>> +static bool intel_hdmi_live_status(struct intel_digital_port *intel_dig_port)
>> +{
>> +	struct drm_device *dev = intel_dig_port->base.base.dev;
>> +	struct drm_i915_private *dev_priv = to_i915(dev);
>> +	enum port port = intel_dig_port->port;
>> +
>> +	if (IS_SKYLAKE(dev)) {
>> +		u32 temp = I915_READ(SDEISR);
>> +
>> +		switch (port) {
>> +		case PORT_B:
>> +			return temp & SDE_PORTB_HOTPLUG_CPT;
>> +
>> +		case PORT_C:
>> +			return temp & SDE_PORTC_HOTPLUG_CPT;
>> +
>> +		case PORT_D:
>> +			return temp & SDE_PORTD_HOTPLUG_CPT;
>> +
>> +		default:
>> +			return false;
>> +		}
>
> The old code had per-platform helper functions for this instead of a big
> if-ladder. I think that would look better.
>
Hmm, I see g4x_digital_port_connected and ibx_digital_port_connected 
which already checks for these bits. We can reuse that here instead.
I'l send the next version.

Thanks,
Sonika

> Also when you digg out these old versions please also cite the commit sha1
> of the patches where we had to last revert this (and explain why it's now
> save).
> -Daniel
>
>> +	} else if (IS_BROXTON(dev)) {
>> +		u32 temp = I915_READ(GEN8_DE_PORT_ISR);
>> +
>> +		switch (port) {
>> +		case PORT_B:
>> +			return temp & BXT_DE_PORT_HP_DDIB;
>> +
>> +		case PORT_C:
>> +			return temp & BXT_DE_PORT_HP_DDIC;
>> +
>> +		default:
>> +			return false;
>> +
>> +		}
>> +	}
>> +	return true;
>> +}
>> +
>>   static bool
>>   intel_hdmi_set_edid(struct drm_connector *connector)
>>   {
>> @@ -1308,15 +1348,16 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>>   	struct intel_encoder *intel_encoder =
>>   		&hdmi_to_dig_port(intel_hdmi)->base;
>>   	enum intel_display_power_domain power_domain;
>> -	struct edid *edid;
>> +	struct edid *edid = NULL;
>>   	bool connected = false;
>>
>>   	power_domain = intel_display_port_power_domain(intel_encoder);
>>   	intel_display_power_get(dev_priv, power_domain);
>>
>> -	edid = drm_get_edid(connector,
>> -			    intel_gmbus_get_adapter(dev_priv,
>> -						    intel_hdmi->ddc_bus));
>> +	if (intel_hdmi_live_status(hdmi_to_dig_port(intel_hdmi)))
>> +		edid = drm_get_edid(connector,
>> +				intel_gmbus_get_adapter(dev_priv,
>> +					intel_hdmi->ddc_bus));
>>
>>   	intel_display_power_put(dev_priv, power_domain);
>>
>> --
>> 1.7.10.4
>>
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>
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