[Intel-gfx] [RFC 07/14] drm/i915: Disable MIPI display self refresh mode

[Singh, Gaurav K]

On 5/29/2015 10:50 PM, Daniel Vetter wrote:
> On Fri, May 29, 2015 at 07:16:36PM +0200, Daniel Vetter wrote:
>> On Fri, May 29, 2015 at 04:06:59PM +0530, Gaurav K Singh wrote:
>>> During disable sequence for MIPI encoder in command mode, disable
>>> MIPI display self-refresh mode bit in Pipe Ctrl reg.
>>>
>>> Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
>>> Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu at intel.com>
>>> Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
>>> ---
>>>   drivers/gpu/drm/i915/intel_display.c |   13 +++++++++++++
>>>   1 file changed, 13 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>>> index 895d7c7..cab2ac8 100644
>>> --- a/drivers/gpu/drm/i915/intel_display.c
>>> +++ b/drivers/gpu/drm/i915/intel_display.c
>>> @@ -2171,6 +2171,9 @@ static void intel_enable_pipe(struct intel_crtc *crtc)
>>>   static void intel_disable_pipe(struct intel_crtc *crtc)
>>>   {
>>>   	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
>>> +	struct intel_encoder *encoder;
>>> +	struct intel_dsi *intel_dsi;
>>> +	struct drm_device *dev = crtc->base.dev;
>>>   	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
>>>   	enum pipe pipe = crtc->pipe;
>>>   	int reg;
>>> @@ -2189,6 +2192,16 @@ static void intel_disable_pipe(struct intel_crtc *crtc)
>>>   	if ((val & PIPECONF_ENABLE) == 0)
>>>   		return;
>>>   
>>> +	for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
>>> +		if (encoder->type == INTEL_OUTPUT_DSI) {
>>> +			intel_dsi = enc_to_intel_dsi(&encoder->base);
>>> +			if (intel_dsi && (intel_dsi->operation_mode ==
>>> +						INTEL_DSI_COMMAND_MODE))
>>> +				val = val & ~PIPECONF_MIPI_DSR_ENABLE;
>>> +			break;
>>> +		}
>>> +	}
>> This must be moved into a suitable encoder callback. Yes the ddi code is
>> full of cases where encoder stuff is done from the generic crtc code. But
>> we now have 2 completely different kinds of ports on bxt (ddi and dsi),
>> and we need to get some solid structure into the code again.
> Ah I missed that this is a pipeconf thing. Unconditionally clearing this
> bit will achieve the same, without the need to loop over connectors.
> -Daniel
Agree with you. Instead of loop over the encoders, will set up the state 
flag and will use it here.