[PATCH] imx-drm: imx-drm-core: add suspend/resume support

[mkl@pengutronix.de (Marc Kleine-Budde)]

On 07/24/2014 11:47 AM, Lucas Stach wrote:
> Am Donnerstag, den 24.07.2014, 17:17 +0800 schrieb Shawn Guo:
>> HDMI currently stops working after a system suspend/resume cycle.  It
>> turns out that the cause is the imx-hdmi encoder .dpms hook doesn't get
>> called from anywhere across suspend/resume cycle.
>>
>> The patch follows what exynos drm driver does to walk the list of
>> connectors and call their .dpms function from suspend/resume hook.  And
>> the connectors' .dpms function will in turn filter down to the .dpms
>> hooks of encoders and CRTCs.
>>
>> With this change, HDMI can continue working after a suspend/resume
>> cycle.
>>
>> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
>> ---
>> Tested with HDMI and LVDS.  It'd be great if someone can help test TVE
>> to ensure the patch doesn't break anything.
>>
>>  drivers/staging/imx-drm/imx-drm-core.c | 39 ++++++++++++++++++++++++++++++++++
>>  1 file changed, 39 insertions(+)
>>
>> diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
>> index def8280d7ee6..b0ea1f0ed32f 100644
>> --- a/drivers/staging/imx-drm/imx-drm-core.c
>> +++ b/drivers/staging/imx-drm/imx-drm-core.c
>> @@ -696,6 +696,44 @@ static int imx_drm_platform_remove(struct platform_device *pdev)
>>  	return 0;
>>  }
>>  
>> +#if CONFIG_PM_SLEEP
> 
> use #ifdef

...or remove #if/#ifdef and mark as __maybe_unused

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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