linux-kernel - Re: [PATCH v2] drm/mxsfb: fix pixel clock polarity

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Date:   Tue, 07 Feb 2017 21:19:49 -0800
From:   Stefan Agner <stefan@...er.ch>
To:     Marek Vasut <marex@...x.de>, airlied@...ux.ie
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/mxsfb: fix pixel clock polarity

Dave, Marek,

On 2016-12-14 13:25, Marek Vasut wrote:
> On 12/14/2016 09:48 PM, Stefan Agner wrote:
>> The DRM subsystem specifies the pixel clock polarity from a
>> controllers perspective: DRM_BUS_FLAG_PIXDATA_NEGEDGE means
>> the controller drives the data on pixel clocks falling edge.
>> That is the controllers DOTCLK_POL=0 (Default is data launched
>> at negative edge).
>>
>> Also change the data enable logic to be high active by default
>> and only change if explicitly requested via bus_flags. With
>> that defaults are:
>> - Data enable: high active
>> - Pixel clock polarity: controller drives data on negative edge
>>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
> 
> Acked-by: Marek Vasut <marex@...x.de>
> 

This seems not have made into drm-next yet. Not sure what the plan is
here, who will pick this up? There is also another fix on ML for the
same driver ("drm: mxsfb: Fix crash when provided invalid DT bindings").

--
Stefan

>> ---
>> Changes since v1:
>> - Improved comments/fixed typo
>>
>>  drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 11 +++++++++--
>>  1 file changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
>> index 3770dd2..5556e53 100644
>> --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
>> +++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
>> @@ -195,9 +195,16 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
>>  		vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
>>  	if (m->flags & DRM_MODE_FLAG_PVSYNC)
>>  		vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
>> -	if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
>> +	/* Make sure Data Enable is high active by default */
>> +	if (!(bus_flags & DRM_BUS_FLAG_DE_LOW))
>>  		vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
>> -	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
>> +	/*
>> +	 * DRM_BUS_FLAG_PIXDATA_ defines are controller centric,
>> +	 * controllers VDCTRL0_DOTCLK is display centric.
>> +	 * Drive on positive edge       -> display samples on falling edge
>> +	 * DRM_BUS_FLAG_PIXDATA_POSEDGE -> VDCTRL0_DOTCLK_ACT_FALLING
>> +	 */
>> +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
>>  		vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
>>
>>  	writel(vdctrl0, mxsfb->base + LCDC_VDCTRL0);
>>