Re: [PATCH 6/6] ARM: da850: adjust memory settings for tilcdc
From: Karl Beldan
Date: Fri Sep 30 2016 - 05:39:26 EST
On Fri, Sep 30, 2016 at 9:31 AM, Bartosz Golaszewski
> 2016-09-29 21:07 GMT+02:00 Karl Beldan <karl.beldan@xxxxxxxxx>:
>> On Thu, Sep 29, 2016 at 06:31:55PM +0200, Bartosz Golaszewski wrote:
>>> Default memory settings of da850 do not meet the throughput/latency
>>> requirements of tilcdc. This results in the image displayed being
>>> incorrect and the following warning being displayed by the LCDC
>>> drm driver:
>>> tilcdc da8xx_lcdc.0: tilcdc_crtc_irq(0x00000020): FIFO underfow
>>> Reconfigure the LCDC priority to the highest. This is a workaround
>>> for the da850-lcdk board which has the LCD controller enabled in
>>> the device tree, but a long-term, system-wide fix is needed for
>>> all davinci boards.
>>> This patch has been modified for mainline linux. It comes from a
>>> downstream TI release for da850.
>>> Original author: Vishwanathrao Badarkhe, Manish <manishv.b@xxxxxx>
>>>  http://arago-project.org/git/projects/linux-davinci.git?p=projects/linux-davinci.git;a=commitdiff;h=b9bd39a34cc02c3ba2fc15539a2f0bc2b68d25da;hp=6f6c795faa6366a4ebc1037a0235edba6018a991
>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>> FWIW, the quirks could be applied conditionnally depending on the lcdc
>> node presence in the DT, a bit like:
> Hi Karl,
> I decided to post the simplest possible way of this to get the lcdc
> working upstream. In parallel I'm working on a system-wide way of
> applying such quirks not only limited to device tree nodes' presence.
Ok, that'd be a good thing, apparently people have been looking
to do such a thing for the am335x as well.
> Thanks for the info!
> Best regards,
> Bartosz Golaszewski