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

[Jani Nikula]

On Wed, 03 Feb 2016, Jani Nikula <jani.nikula at intel.com> wrote:
> On Wed, 03 Feb 2016, Mika Kahola <mika.kahola at intel.com> wrote:
>> On Wed, 2016-02-03 at 11:27 +0200, Jani Nikula wrote:
>>> 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.
>>> 
>> I have this in my tree. I assume that you are referring to this patch?
>>
>> https://patchwork.freedesktop.org/patch/58446/
>
> That's the one. Thanks.

BTW, please repost the patches so we get a CI result.

BR,
Jani.

>
> BR,
> Jani.
>
>>
>> -Mika-
>>
>>> 
>>> 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