linux-kernel - Re: [5/5] ARM: tegra: jetson-tk1: enable GK20A GPU

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Date:	Thu, 25 Sep 2014 09:48:01 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sjoerd Simons <sjoerd@...n.net>,
	Alexandre Courbot <acourbot@...dia.com>
CC:	Ben Skeggs <bskeggs@...hat.com>,
	Thierry Reding <thierry.reding@...il.com>,
	nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	gnurou@...il.com
Subject: Re: [5/5] ARM: tegra: jetson-tk1: enable GK20A GPU

On 09/25/2014 07:27 AM, Sjoerd Simons wrote:
> Playing a bit with todays linux-next on my jetson, it seems this patch is
> still required for enabling the GPU. Is there anything blocking it (firmware
> not available yet in liux-firmware?)

I think initially I was waiting for the DRM patch "drm/nouvea: support 
for probing platform devices" to be applied, but it looks like that's 
been applied already, so only patches 4 and 5 in this series are still 
outstanding.

Alex, wasn't there also some issue where the VPR register had to be 
programmed, and if it wasn't there'd be a hang when the GPU registers 
were touched? If we've added code to Nouveau/tegradrm to detect that and 
avoid the problem, then I guess we can commit these last two patches for 
3.19. A resend after the 3.18 merge window might help.

> On Mon, May 19, 2014 at 06:24:10PM +0900, Alexandre Courbot wrote:
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>>   arch/arm/boot/dts/tegra124-jetson-tk1.dts | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/tegra124-jetson-tk1.dts b/arch/arm/boot/dts/tegra124-jetson-tk1.dts
>> index e31fb61a81d3..15a194d1277f 100644
>> --- a/arch/arm/boot/dts/tegra124-jetson-tk1.dts
>> +++ b/arch/arm/boot/dts/tegra124-jetson-tk1.dts
>> @@ -30,6 +30,12 @@
>>   		};
>>   	};
>>
>> +	gpu@0,57000000 {
>> +		status = "okay";
>> +
>> +		vdd-supply = <&vdd_gpu>;
>> +	};
>> +
>>   	pinmux: pinmux@0,70000868 {
>>   		pinctrl-names = "default";
>>   		pinctrl-0 = <&state_default>;
>> @@ -1505,7 +1511,7 @@
>>   					regulator-always-on;
>>   				};
>>
>> -				sd6 {
>> +				vdd_gpu: sd6 {
>>   					regulator-name = "+VDD_GPU_AP";
>>   					regulator-min-microvolt = <650000>;
>>   					regulator-max-microvolt = <1200000>;
>

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