redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry 

Currently when entering fastsleep we clear all LPCR PECE bits.

This patch changes it to only clear the decrementer bit (ie. PECE1), which is
the only bit we really need to clear here.  This is needed if we want to set
other wakeup causes like the PECEDH bit so we can use hypervisor doorbells on
powernv.  Also we no longer clear the MER bit as it should never be set in the
host anyway.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Michael Neuling 2014-06-11 15:59:27 +10:00 committed by Benjamin Herrenschmidt
parent 5c7a35e3e2
commit 9b6a68d943
1 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/cpuidle/cpuidle-powernv.c
View File

@ -73,12 +73,10 @@ static int fastsleep_loop(struct cpuidle_device *dev,
return index;
new_lpcr = old_lpcr;
new_lpcr &= ~(LPCR_MER | LPCR_PECE); /* lpcr[mer] must be 0 */
/* exit powersave upon external interrupt, but not decrementer
* interrupt.
/* Do not exit powersave upon decrementer as we've setup the timer
* offload.
*/
new_lpcr |= LPCR_PECE0;
new_lpcr &= ~LPCR_PECE1;
mtspr(SPRN_LPCR, new_lpcr);
power7_sleep();