[PATCH v3 0/9] Migrate Tegra to common clock framework

Stephen Warren swarren at wwwdotorg.org
Wed Jan 9 12:34:49 EST 2013

On 01/09/2013 03:59 AM, Prashant Gaikwad wrote:
> On Wednesday 09 January 2013 02:31 AM, Stephen Warren wrote:
>> On 01/08/2013 11:49 AM, Stephen Warren wrote:
>>> On 01/08/2013 06:19 AM, Prashant Gaikwad wrote:
>>>> On Tuesday 08 January 2013 05:40 AM, Stephen Warren wrote:
>>>>> On 01/04/2013 10:22 AM, Stephen Warren wrote:
>>>>>> On 01/04/2013 02:40 AM, Prashant Gaikwad wrote:
>>>>>>> This patchset does following:
>>>>>>> 1. Decompose single tegra clock structure into multiple clocks.
>>>>>>> 2. Try to use standard clock types supported by common clock
>>>>>>> framework.
>>>>>>> 3. Use dynamic initialization.
>>>>>>> 4. Move all clock code to drivers/clk/tegra from mach-tegra.
>>>>>>> 5. Add device tree support for Tegra20 and Tegra30 clocks.
>>>>>>> 6. Remove all legacy clock code from mach-tegra.
>>>>>> I think there are bugs here. I applied all your clock patches on
>>>>>> top of
>>>>>> Tegra's for-next (see list below), and found that the following don't
>>>>>> work on Springbank:
>>>>>> * HDMI display
>>>>>> * Audio playback
>>>>>> * WiFi
>>>>> (BTW, I stopped Cc'ing linux-kernel@, but added linux-tegra@
>>>>> instead...)
>>>>> Prashant, some updated testing results based off the "dev/ccf" branch
>>>>> you sent me on our internal git server:
>>> ...
>>>> I have updated the internal branch with all the above mentioned fixes.
>> ...
>>> The remaining item is the display issue on Tegra30, which I'll go look
>>> at now.
>> The USB3 clock, which isn't used by any drivers on Tegra30, and hence
>> was disabled at boot, was set up incorrectly and ended up mapping to the
>> disp1 clock, and hence turned off the display. The following fixes it:
> Stephen, thanks for the fix!! I have included this and PLLE fix; updated
> internal branch.

Almost everything works great now.

However, I don't see any fix for the PLLE issue in the code; if there is
one it certainly doesn't work. Applying my previous hack makes it work.

FYI, the branch I tested with is at
git://nv-tegra.nvidia.com/user/swarren/linux-2.6 test-ccf-rework-2

It's rebased onto the latest Tegra for-next.

More information about the linux-arm-kernel mailing list