[ARM] 2787/2: PXA27x low power modes support
Patch from Todd Poynor
Add symbols for PXA2xx PWRMODE register M field that selects low-power
mode, replace unadorned constants. Honor power mode parameter of
pxa_cpu_suspend(mode), no longer force to 3 (sleep). Full Deep Sleep
low-power mode support for PXA27x is pending generic PM interfaces to
select more than 2 suspend-to-RAM-style power modes, but this is
expected soon. This can be hardcoded in the meantime by replacing the
pxa_cpu_suspend() parameter value. From David Burrage and Todd Poynor.
Try #2 removes one of the register copies and moves the code to save the
pxa_cpu_suspend parameter to immediately surround the call that requires
the parameter value be preserved.
Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/sleep.S b/arch/arm/mach-pxa/sleep.S
index 5786cca..c986268 100644
--- a/arch/arm/mach-pxa/sleep.S
+++ b/arch/arm/mach-pxa/sleep.S
@@ -28,7 +28,9 @@
/*
* pxa_cpu_suspend()
*
- * Forces CPU into sleep state
+ * Forces CPU into sleep state.
+ *
+ * r0 = value for PWRMODE M field for desired sleep state
*/
ENTRY(pxa_cpu_suspend)
@@ -53,6 +55,7 @@
mov r10, sp
stmfd sp!, {r3 - r10}
+ mov r5, r0 @ save sleep mode
@ preserve phys address of stack
mov r0, sp
bl sleep_phys_sp
@@ -66,7 +69,7 @@
@ (also workaround for sighting 28071)
@ prepare value for sleep mode
- mov r1, #3 @ sleep mode
+ mov r1, r5 @ sleep mode
@ prepare pointer to physical address 0 (virtual mapping in generic.c)
mov r2, #UNCACHED_PHYS_0