On 10/17/2012 01:42 PM, Thierry Reding wrote:
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On Tue, Oct 16, 2012 at 10:03:56AM -0600, 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 presume those regulators are for the vdd and pll supplies of the HDMI
output? Those should be properly handled by the tegra_hdmi_probe()
function. Also the way tegra-drm works right now, unless all of the
outputs are registered properly the DRM portion will never even be
initialized.
Not exactly. In hdmi driver, if I try to get/enable vdd & pll regulators
which HDMI needs, error occurs. So currently to make HDMI working on
Tegra 3, we need to temporarily remove these codes.
In fact, there are a lot of this kind of errors, I just pasted some of
them. So there is something in your changes which blocks these
regulators correctly inited cause this issue doesn't exist in upstream
codes.
Thierry
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