Commit 512f03fd authored by eric miao's avatar eric miao Committed by Russell King
Browse files

[ARM] pxa: skip registers saving/restoring if entering standby mode 



registers are retained during standby mode, thus it's not necessary
to save/restore and checksum

Signed-off-by: default avatareric miao <eric.miao@marvell.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent dd01b2fc

arch/arm/mach-pxa/pm.c

+18 −15
Original line number Diff line number Diff line
@@ -38,19 +38,22 @@ int pxa_pm_enter(suspend_state_t state) 
		iwmmxt_task_disable(NULL);

#endif



	/* skip registers saving for standby */

	if (state != PM_SUSPEND_STANDBY) {

		pxa_cpu_pm_fns->save(sleep_save);



	/* Clear sleep reset status */

	RCSR = RCSR_SMR;



		/* before sleeping, calculate and save a checksum */

		for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)

			sleep_save_checksum += sleep_save[i];

	}



	/* Clear sleep reset status */

	RCSR = RCSR_SMR;



	/* *** go zzz *** */

	pxa_cpu_pm_fns->enter(state);

	cpu_init();



	if (state != PM_SUSPEND_STANDBY) {

		/* after sleeping, validate the checksum */

		for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)

			checksum += sleep_save[i];
@@ -63,8 +66,8 @@ int pxa_pm_enter(suspend_state_t state) 
			while (1)

				pxa_cpu_pm_fns->enter(state);

		}



		pxa_cpu_pm_fns->restore(sleep_save);

	}



	pr_debug("*** made it back from resume\n");