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. 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
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