On 10/16/2012 02:18 AM, Mark Zhang wrote: > Hi, > > I've made this drm driver worked on Tegra 3(LVDS and HDMI both). > But the code that Thierry > hosts(git://gitorious.org/thierryreding/linux.git) doesn't work > directly. If you build and run it, you'll get a white blank screen on > Tegra 3. I didn't find the root cause but I think this is not caused by > drm driver itself(maybe the PCIE codes?). The main symptom is: some > regulators can't be inited all the time. I tried to build drm driver as > kernel module, after kernel booted, modprobe the drm driver, and you'll > find there are a lot of error prints like this: > > ========================================================= > [ 21.383529] reg-fixed-voltage 1.regulator: Failed to find supply vin > [ 21.390299] reg-fixed-voltage 1.regulator: Failed to register > regulator: -517 > [ 21.397645] platform 1.regulator: Driver reg-fixed-voltage requests > probe deferral > [ 21.405604] platform 2.regulator: Driver reg-fixed-voltage requests > probe deferral > ========================================================= This is normal; it's probe deferral. You'll find that those regulators initialize correctly later. Hopefully tegra-drm handles this correctly, and passes that error code through as the result of its probe. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
