On 10/18/2012 01:55 PM, Thierry Reding wrote:
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On Wed, Oct 17, 2012 at 02:38:50PM -0600, Stephen Warren wrote:
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:
Yeah, I think my default configuration is pretty messed up by now. I'm
in the process of merging down patches and along the way I planned to
drop all the defconfig updates and do the from scratch so that these
issues will hopefully be gone.
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)
I think Mark had some other modifications that were required to get HDMI
working on CardHu. Something related to the clocks IIRC. Does LVDS work?
Another thing I'm going to work into the cleaned up patches is support
for the video mode helpers by Steffen. I actually like the approach
better than the binary EDID blob, so I will probably replace the blob on
Medcom Wide in favour of a display mode entry in DT.
By the way, it would be nice if we could start to collect the various DT
snippets for the different boards. For most of the NVIDIA designs these
are still missing, just like for AC100. As for the TrimSlice I'm not
sure if it works properly.
Yes, I have some DT snippets for Tegra 2 Ventana board. I'll send it to
you later.
Mark
Thierry
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