[PATCH v2 0/7] drm/exynos: add pm runtime support

[Inki Dae]

2015년 11월 20일 19:59에 Inki Dae 이(가) 쓴 글:
> Hi Javier,
> 
> 2015년 11월 20일 00:51에 Javier Martinez Canillas 이(가) 쓴 글:
>> On 11/19/2015 11:55 AM, Javier Martinez Canillas wrote:
>>>>>
>>>>
>>>> This series causes a boot failure on at least an Exynos5800 Peach Pi
>>>> Chromebook (tested myself) and seems to be the cause of other Exynos
>>>> boards failing to boot: http://kernelci.org/boot/?exynos&fail
>>>>
>>>> [snip]
>>>>
>>>>>   drm/exynos: add pm_runtime to Mixer
>>>>>   drm/exynos: add pm_runtime to FIMD
>>>>
>>>> I had to revert these patches in order to get the machine in a bootable
>>>> state again, the sha1 hash for these patches in next-20151119 are:
>>>>
>>>> 045febd5f813 drm/exynos: add pm_runtime to FIMD
>>
>> On a closer look, only reverting the FIMD patch is enough
>> to make at least the Exynos5800 Peach Pi to boot again.
> 
> Thanks for report.
> 
> I assume that the issue is because above patch removed 'suspended' variable
> for checking the suspend status in runtime so I revived it.
> 
> I'm not sure that the change could resolve the issue. Could you test it
> with the change again? I have no Exynos5800 Peach Pi board. :(
> 
> For this, I pushed it to below exynos-drm/for-next branch,
> 	https://git.kernel.org/cgit/linux/kernel/git/daeinki/drm-exynos.git/commit/?h=exynos-drm/for-next&id=e84f43e2b2c3388694b0b3a58c2c4447f1fbae7c
> 
> If the issue is resolved by the change then I will modify other patches for
> DECON series. And if really so, there may be a corner case we missed.

Oops, I found out one error at the boot log,
http://storage.kernelci.org/next/next-20151120/arm-multi_v7_defconfig+CONFIG_LKDTM=y/lab-collabora/boot-exynos5800-peach-pi.html

The boot log says,
[    5.754493] vdd_ldo9: supplied by vdd_2v
[    5.765510] of_graph_get_next_endpoint(): no port node found in /dp-controller at 145B0000

Seems this error is because exynos5800-peach-pit.dts file doesn't have 'ports' node in dp node.

Below is dp node description of exynos5420-peach-pit.dts file.
&dp {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&dp_hpd_gpio>;
	samsung,color-space = <0>;
	samsung,dynamic-range = <0>;
	samsung,ycbcr-coeff = <0>;
	samsung,color-depth = <1>;
	samsung,link-rate = <0x06>;
	samsung,lane-count = <2>;
	samsung,hpd-gpio = <&gpx2 6 GPIO_ACTIVE_HIGH>;

	ports {
		port at 0 {
			dp_out: endpoint {
				remote-endpoint = <&bridge_in>;
			};
		};
	};
};

And below is for exynos5800-peash-pit.dts,
&dp {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&dp_hpd_gpio>;
	samsung,color-space = <0>;
	samsung,dynamic-range = <0>;
	samsung,ycbcr-coeff = <0>;
	samsung,color-depth = <1>;
	samsung,link-rate = <0x0a>;
	samsung,lane-count = <2>;
	samsung,hpd-gpio = <&gpx2 6 GPIO_ACTIVE_HIGH>;
	panel = <&panel>;
};

Thanks,
Inki Dae

> 
> Thanks,
> Inki Dae
> 
>>
>> Best regards,
>>