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drm/nouveau: Pause between setting gpu to D3hot and cutting the power 

On the MacBook Pro, power of the gpu is cut by a gmux chip. Sometimes
the gpu gets stuck in powersaving mode and refuses to wake up
("Refused to change power state, currently in D3"). Inserting a
delay between setting the gpu to D3hot and cutting the power seems
to help (most of the time). This issue and its (partial) remediation
by the patch was observed with an Nvidia GT650M (NVE7 / GK107).

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Lukas Wunner 2015-04-19 17:18:01 +02:00 committed by Dave Airlie
parent 6b8eeca65b
commit c5fd936e99
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/nouveau_drm.c
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@ -23,6 +23,7 @@
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
@ -666,6 +667,7 @@ nouveau_pmops_suspend(struct device *dev)
pci_save_state(pdev);
pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
udelay(200);
return 0;
}