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    SubjectRe: [PATCH 6/6] ARM: da850: adjust memory settings for tilcdc
    On Fri, Sep 30, 2016 at 9:31 AM, Bartosz Golaszewski
    <bgolaszewski@baylibre.com> wrote:
    > 2016-09-29 21:07 GMT+02:00 Karl Beldan <karl.beldan@gmail.com>:
    >> Hi,
    >>
    >> 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[1].
    >>>
    >>> Original author: Vishwanathrao Badarkhe, Manish <manishv.b@ti.com>
    >>>
    >>> [1] 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@baylibre.com>
    >>> ---
    >>
    >> FWIW, the quirks could be applied conditionnally depending on the lcdc
    >> node presence in the DT, a bit like:
    >> https://github.com/kbeldan/linux/commit/cf15572ffef8e8a0d8110b3f6b29bd401d0538be
    >> https://github.com/kbeldan/linux/commit/07e4fff9958bc1625a96791dce284c163fbe9c43
    >>
    >>
    >> Regards,
    >> Karl
    >
    > 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.

    Regards,
    Karl

    > Thanks for the info!
    >
    > Best regards,
    > Bartosz Golaszewski

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