On 10/16/2012 07:32 PM, Mark Zhang wrote: > On 10/17/2012 12:03 AM, Stephen Warren wrote: >> 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. >> > > I don't think so. In normal scenario, the regulator will be inited > correctly finally. But in the scenario I described above, these > regulators will not be inited correctly all the time. Just as I > mentioned above, I tried to build drm driver as kernel module, that > means I will load drm driver after kernel booting finished. Besides, > during the loading of drm driver, these regulator probe error were still > be printed out. And I'm sure this is not the normal case. The Cardhu PMIC driver isn't enabled in tegra_defconfig in Thierry's branch. Do this: > diff --git a/arch/arm/configs/tegra_defconfig b/arch/arm/configs/tegra_defconfig > index c2a2f6e..90f4d5c 100644 > --- a/arch/arm/configs/tegra_defconfig > +++ b/arch/arm/configs/tegra_defconfig > @@ -124,16 +124,19 @@ CONFIG_SPI_OCORES=m > CONFIG_GPIO_SYSFS=y > CONFIG_GPIO_ADNP=y > CONFIG_GPIO_TPS6586X=y > +CONFIG_GPIO_TPS65910=y > CONFIG_POWER_SUPPLY=y > CONFIG_BATTERY_SBS=y > CONFIG_SENSORS_LM90=y > -CONFIG_SENSORS_ADC081C=m > CONFIG_MFD_TPS6586X=y > +CONFIG_MFD_TPS65910=y > CONFIG_REGULATOR=y > CONFIG_REGULATOR_FIXED_VOLTAGE=y > CONFIG_REGULATOR_VIRTUAL_CONSUMER=y > CONFIG_REGULATOR_GPIO=y > +CONFIG_REGULATOR_TPS62360=y > CONFIG_REGULATOR_TPS6586X=y > +CONFIG_REGULATOR_TPS65910=y > CONFIG_DRM=m > CONFIG_DRM_TEGRA=m > CONFIG_DRM_TEGRA_DEBUG=y > @@ -172,7 +175,7 @@ CONFIG_RTC_CLASS=y > CONFIG_RTC_INTF_SYSFS=y > CONFIG_RTC_INTF_PROC=y > CONFIG_RTC_INTF_DEV=y > -CONFIG_RTC_DRV_PCF8523=y > +CONFIG_RTC_DRV_TPS65910=y > CONFIG_RTC_DRV_TEGRA=y > CONFIG_DMADEVICES=y > CONFIG_TEGRA20_APB_DMA=y (That still doesn't make tegradrm work for me on Cardhu, but it does solve the regulator issue) -- 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
