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Date: Fri, 30 Sep 2016 11:31:46 +0200 From: Bartosz Golaszewski <bgolaszewski@...libre.com> To: Karl Beldan <karl.beldan@...il.com> Cc: Kevin Hilman <khilman@...libre.com>, Michael Turquette <mturquette@...libre.com>, Sekhar Nori <nsekhar@...com>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Russell King <linux@...linux.org.uk>, LKML <linux-kernel@...r.kernel.org>, arm-soc <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH 6/6] ARM: da850: adjust memory settings for tilcdc 2016-09-29 21:07 GMT+02:00 Karl Beldan <karl.beldan@...il.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@...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@...libre.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. Thanks for the info! Best regards, Bartosz Golaszewski
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