[PATCH v4 02/13] pm: at91: pm_slowclock: remove clocks which are already stopped when entering slow clock mode
From: Wenyou Yang <hidden>
Date: 2015-01-28 01:44:25
Also in:
lkml
Subsystem:
arm port, arm/microchip (at91) soc support, the rest · Maintainers:
Russell King, Nicolas Ferre, Alexandre Belloni, Claudiu Beznea, Linus Torvalds
From: Sylvain Rochet <redacted> 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 <redacted> --- 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
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1.7.9.5