[Intel-gfx] [PATCH] drm/i915/BXT: Configure DSI after enabling DSI pll

[Jani Nikula]

On Wed, 03 Feb 2016, "Thulasimani, Sivakumar" <sivakumar.thulasimani at intel.com> wrote:
> just realized that intel_dsi_init is not called from setup outputs for 
> BXT. is this expected ?
> if so when is it expected to be added ?
>
> Again, the current code in intel_setup_outputs calls intel_dsi_init from
> vlv/chv section so please confirm if this is needed for all platforms
> or just in BXT.

Good (and embarrassing) catch!

This may uncover more problems, since apparently we haven't been truly
controlling DSI ourselves, but it's just what's set up by the GOP. Ugh.

Do you have it in your tree?

Mika, please try adding intel_dsi_init() call to the IS_BROXTON() branch
of intel_setup_outputs(). It shouldn't matter whether it's before or
after the ddi init calls, as the VBT should (fingers crossed) contain
the right port info.


BR,
Jani.




>
> On 2/2/2016 11:21 PM, Ramalingam C wrote:
>> We need to enable DSI PLL before configuring the DSI registers.
>>
>> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_dsi.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
>> index 91cef35..378f879 100644
>> --- a/drivers/gpu/drm/i915/intel_dsi.c
>> +++ b/drivers/gpu/drm/i915/intel_dsi.c
>> @@ -478,8 +478,8 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder)
>>   
>>   	DRM_DEBUG_KMS("\n");
>>   
>> -	intel_dsi_prepare(encoder);
>>   	intel_enable_dsi_pll(encoder);
>> +	intel_dsi_prepare(encoder);
>>   
>>   	/* Panel Enable over CRC PMIC */
>>   	if (intel_dsi->gpio_panel)
>

-- 
Jani Nikula, Intel Open Source Technology Center