[Intel-gfx] [MIPI CABC 1/2] drm/i915: Parsing the PWM cntrl and CABC ON/OFF fileds in VBT

[Jani Nikula]

On Wed, 25 Nov 2015, Jani Nikula <jani.nikula at intel.com> wrote:
> On Mon, 16 Nov 2015, Deepak M <m.deepak at intel.com> wrote:
>> For dual link panel scenarios there are new fileds added in the
>> VBT which indicate on which port the PWM cntrl and CABC ON/OFF
>> commands needs to be sent.
>>
>> Cc: Jani Nikula <jani.nikula at intel.com>
>> Cc: Daniel Vetter <daniel.vetter at intel.com>
>> Cc: Yetunde Adebisi <yetundex.adebisi at intel.com>
>> Signed-off-by: Deepak M <m.deepak at intel.com>
>> ---
>>  drivers/gpu/drm/i915/intel_bios.c | 13 +++++++++++++
>>  drivers/gpu/drm/i915/intel_bios.h |  5 ++++-
>>  drivers/gpu/drm/i915/intel_dsi.h  |  2 ++
>>  3 files changed, 19 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
>> index ce82f9c..2ef8721 100644
>> --- a/drivers/gpu/drm/i915/intel_bios.c
>> +++ b/drivers/gpu/drm/i915/intel_bios.c
>> @@ -793,6 +793,19 @@ parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
>>  		return;
>>  	}
>>  
>> +	/*
>> +	 * These below bits will inform us on which port the panel blk_cntrl and
>> +	 * CABC ON/OFF commands needs to be sent in case of dual link panels
>> +	 *	u16 dl_cabc_port:2;
>> +	 *	u16 pwm_bkl_ctrl:2;
>> +	 * But these are introduced from the VBT version 197 onwards, so making
>> +	 * sure that these bits are zero in the pervious versions.
>> +	 */
>> +	if (dev_priv->vbt.dsi.config->dual_link && bdb->version < 197) {
>> +		dev_priv->vbt.dsi.config->dl_cabc_port = 0;
>> +		dev_priv->vbt.dsi.config->pwm_bkl_ctrl = 0;
>> +	}
>> +
>
> dev_priv->vbt is zero by default, so none of the above is needed.

Ugh, I didn't realize we just copy the dsi.config verbatim from
VBT. Maybe we do want this after all.


>
>>  	/* We have mandatory mipi config blocks. Initialize as generic panel */
>>  	dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
>>  
>> diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
>> index 7ec8c9a..9283969 100644
>> --- a/drivers/gpu/drm/i915/intel_bios.h
>> +++ b/drivers/gpu/drm/i915/intel_bios.h
>> @@ -832,7 +832,10 @@ struct mipi_config {
>>  	u16 dual_link:2;
>>  	u16 lane_cnt:2;
>>  	u16 pixel_overlap:3;
>> -	u16 rsvd3:9;
>> +	u16 rgb_flip:1;
>> +	u16 dl_cabc_port:2;
>> +	u16 pwm_bkl_ctrl:2;
>> +	u16 rsvd3:4;
>>  
>>  	u16 rsvd4;
>>  
>> diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
>> index e6cb252..4fde83b 100644
>> --- a/drivers/gpu/drm/i915/intel_dsi.h
>> +++ b/drivers/gpu/drm/i915/intel_dsi.h
>> @@ -74,6 +74,8 @@ struct intel_dsi {
>>  
>>  	u8 escape_clk_div;
>>  	u8 dual_link;
>> +	u8 bkl_dcs_ports;
>> +	u8 pwm_blk_ctrl;
>
> This is a much more natural place to explain what these things do.
>
>>  	u8 pixel_overlap;
>>  	u32 port_bits;
>>  	u32 bw_timer;

-- 
Jani Nikula, Intel Open Source Technology Center