From: Sylvain Rochet <sylvain.roc...@finsecur.com>
Assume USB PLL and PLL B are already stopped before entering sleep mode,
print a warning if this isn't the case.
Removed PLL B from slow clock code, all drivers are supposed to properly
unprepare clocks.
Signed-off-by: Sylvain Rochet <sylvain.roc...@finsecur.com>
---
arch/arm/mach-at91/pm.c | 12 ++++++++++++
arch/arm/mach-at91/pm_slowclock.S | 31 -------------------------------
2 files changed, 12 insertions(+), 31 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 87c1fd8..5dd4e41 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -98,6 +98,18 @@ static int at91_pm_verify_clocks(void)
}
}
+ /* Drivers should have previously suspended USB PLL */
+ if (at91_pmc_read(AT91_CKGR_UCKR) & AT91_PMC_UPLLEN) {
+ pr_err("AT91: PM - Suspend-to-RAM with USB PLL running\n");
+ return 0;
+ }
+
+ /* Drivers should have previously suspended PLL B */
+ if (at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKB) {
+ pr_err("AT91: PM - Suspend-to-RAM with PLL B running\n");
+ return 0;
+ }
+
return 1;
}
diff --git a/arch/arm/mach-at91/pm_slowclock.S
b/arch/arm/mach-at91/pm_slowclock.S
index 50744e7..e2bfaf5 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -59,15 +59,6 @@ tmp2 .req r5
beq 1b
.endm
-/*
- * Wait until PLLB has locked.
- */
- .macro wait_pllblock
-1: ldr tmp1, [pmc, #AT91_PMC_SR]
- tst tmp1, #AT91_PMC_LOCKB
- beq 1b
- .endm
-
.text
/* void at91_slow_clock(void __iomem *pmc, void __iomem *sdramc,
@@ -173,13 +164,6 @@ sdr_sr_done:
orr tmp1, tmp1, #(1 << 29) /* bit 29 always set */
str tmp1, [pmc, #AT91_CKGR_PLLAR]
- /* Save PLLB setting and disable it */
- ldr tmp1, [pmc, #AT91_CKGR_PLLBR]
- str tmp1, .saved_pllbr
-
- mov tmp1, #AT91_PMC_PLLCOUNT
- str tmp1, [pmc, #AT91_CKGR_PLLBR]
-
/* Turn off the main oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
bic tmp1, tmp1, #AT91_PMC_MOSCEN
@@ -195,18 +179,6 @@ sdr_sr_done:
wait_moscrdy
- /* Restore PLLB setting */
- ldr tmp1, .saved_pllbr
- str tmp1, [pmc, #AT91_CKGR_PLLBR]
-
- tst tmp1, #(AT91_PMC_MUL & 0xff0000)
- bne 1f
- tst tmp1, #(AT91_PMC_MUL & ~0xff0000)
- beq 2f
-1:
- wait_pllblock
-2:
-
/* Restore PLLA setting */
ldr tmp1, .saved_pllar
str tmp1, [pmc, #AT91_CKGR_PLLAR]
@@ -285,9 +257,6 @@ ram_restored:
.saved_pllar:
.word 0
-.saved_pllbr:
- .word 0
-
.saved_sam9_lpr:
.word 0
--
1.7.9.5
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