On 11 June 2014 03:48, Kevin Hilman <khilman@xxxxxxxxxx> wrote: > Hi Ajay, > > On Tue, Jun 10, 2014 at 1:51 PM, Ajay kumar <ajaynumb@xxxxxxxxx> wrote: >> Hi, >> >> On 6/11/14, Kevin Hilman <khilman@xxxxxxxxxx> wrote: >>> On Tue, Jun 10, 2014 at 11:04 AM, Stéphane Marchesin >>> <marcheu@xxxxxxxxxxxx> wrote: >>>> On Tue, Jun 10, 2014 at 10:56 AM, Kevin Hilman <khilman@xxxxxxxxxx> >>>> wrote: >>>>> I'm trying to get the latest linux-next working on my Chromebook2 >>>>> (it's booting to a serial console) and am now trying to get the >>>>> display working (at least for a frambuffer console.) >>>>> >>>>> Since the display nodes seem to be present in the exynos5800-peach-pi >>>>> DTS, I tried enabling DRM and it's failing to allocate memory (log >>>>> below[1] >>>>> >>>>> Is there some additional memory setup/allocations I should be doing? >>>>> maybe with CMA? >>>> >>>> Probably not CMA, but maybe you don't have the iommu enabled? >>> >>> Turns out it was missing CMA support. Specifically: >>> CONFIG_CMA=y >>> CONFIG_DMA_CMA=y >>> are needed (my full .config is here: http://hastebin.com/uqopirazir.vbs) >>> >>> With that, it allocates, appears to detect the panel and even claims >>> "Console: switching to colour frame buffer device", but I don't see >>> tux or any output on the display (DRM debug output below). >>> >>> Note that I'm chain-loading nv_uboot from an SD card, and u-boot is >>> driving the display (black text on white background.) As soon as it >>> starts the kernel though, u-boot seems to shut down the display >>> (though the backlight seems to still be on.) >>> >>> Maybe the DT for peach-pi is missing the regulator used to power the >>> panel, or maybe a GPIO used to power up the panel? >>> >>> Any ideas? >> Not only the DT patches, but few patches are missing to support the >> panel present on peach-pi. >> You should also take the following patches to be able to get the >> display up on peach-pi: >> http://www.spinics.net/lists/linux-samsung-soc/msg32122.html > > Excellent, thanks for the pointer to those patches. I'll have a look. > > Can you confirm that this should work even when chain-loading > nv_uboot? It appears u-boot is powering down the panel. If u-boot is powering down the panel, you also need EC and Tps DT patches to get regulators up in kernel. Those are not posted yet. I will send these patches to you. Regards, Rahul sharma. > > Kevin > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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