Ajay, Am 01.08.2014 09:02, schrieb Ajay kumar: > On Thu, Jul 31, 2014 at 7:52 PM, Andreas Färber <afaerber@xxxxxxx> wrote: >> Am 31.07.2014 12:23, schrieb Thierry Reding: >>> On Thu, Jul 31, 2014 at 10:57:55AM +0200, Andreas Färber wrote: >>>> Am 31.07.2014 10:38, schrieb Ajay kumar: >>>>> With just the spring-bridge.v6 branch of your own tree, I am able to see >>>>> bootup logo on Skate(a variant of spring which also contains ps8622). >>>>> I have tried both exynos_defconfig and multi_v7_defconfig. >>>>> I enable DRM, EXYNOS DRM, BRIDGE CHIPS, IOMMU, EXYNOS IOMMU >>>>> in configs. >> [...] >>> If you have something like simplefb enabled in addition to a DRM driver, >>> then perhaps the DRM driver isn't properly taking over the framebuffer >>> console. >> >> So, with simplefb reverted in U-Boot and ... >> >> * with just the v6 applied (...~2), I get only a black screen from >> Linux, no penguins, but the backlight seems on. System comes up okay, >> ssh available, and nothing stands out in dmesg. >> >> * with the two iommu patches on top, something breaks badly, no >> backlight, no USB/network, system inaccessible. >> I.e. U-Boot had no noticeable impact on these symptoms. >> >> * with the iommu patches, but dp-controller, ps8622, panel commented >> out, I do get backlight but USB/network not working, system inaccessible. >> >> With simplefb support in U-Boot and with just v6 applied, but >> dp-controller, ps8622, panel commented out, things work as well as >> before, i.e. this series has no bad side effects. Note that I never >> claimed Ajay's series were broken, just reported that things regressed >> for me from v4, which may well be DT-related. >> >> The iommu patches interfere with my USB somehow (none or not all devices >> powered; with v4, plugging my wifi dongle led to oops but ethernet >> dongle worked, so not entirely new symptom), which is bad since my >> rootfs is on USB. The internal SDIO-connected Wifi is not enabled yet, >> so USB based network is my only alternative to a working display once we >> reach userspace. > Well, there are 2 variants here: > 1) Bootloader > 2) config Unfortunately your config doesn't work for me either, on my latest spring-bridge.v6 branch. > Type of the bootloader should not matter unless its switching on > FET1 and FET6 of tps65090 for you. It does switch them on, if I'm reading correctly: https://github.com/afaerber/u-boot/blob/spring/board/samsung/smdk5250/smdk5250.c#L599 https://github.com/afaerber/u-boot/blob/spring/board/samsung/smdk5250/smdk5250.c#L907 Another observation I made is that sometimes in my testing (didn't spot a pattern yet) after reboot or power-off/power-on the initial white screen with the warning did not come up (no backlight), but Ctrl+U worked fine and chain-loaded nv u-boot came up on screen okay. Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
