Le 05/02/2015 07:00, Wenyou Yang a écrit : > From: Sylvain Rochet <sylvain.roc...@finsecur.com> > > Removed timeout on XTAL, PLL lock and Master Clock Ready, hang if > something went wrong instead of continuing in unknown condition. There > is not much we can do if a PLL lock never ends, we are running in SRAM > and we will not be able to connect back the sdram or ddram in order to > be able to fire up a message or just panic. > > As a bonus, not decounting the timeout register in slow clock mode > reduce cumulated suspend time and resume time from ~17ms to ~15ms. > > Signed-off-by: Sylvain Rochet <sylvain.roc...@finsecur.com> > Acked-by: Wenyou.Yang <wenyou.y...@atmel.com>
Acked-by: Nicolas Ferre <nicolas.fe...@atmel.com> and stacked in at91-4.0-fixes. thanks! > --- > arch/arm/mach-at91/pm_slowclock.S | 33 ++++----------------------------- > 1 file changed, 4 insertions(+), 29 deletions(-) > > diff --git a/arch/arm/mach-at91/pm_slowclock.S > b/arch/arm/mach-at91/pm_slowclock.S > index 2001877..79dfdbe 100644 > --- a/arch/arm/mach-at91/pm_slowclock.S > +++ b/arch/arm/mach-at91/pm_slowclock.S > @@ -34,11 +34,6 @@ > */ > #undef SLOWDOWN_MASTER_CLOCK > > -#define MCKRDY_TIMEOUT 1000 > -#define MOSCRDY_TIMEOUT 1000 > -#define PLLALOCK_TIMEOUT 1000 > -#define PLLBLOCK_TIMEOUT 1000 > - > pmc .req r0 > sdramc .req r1 > ramc1 .req r2 > @@ -50,56 +45,36 @@ tmp2 .req r5 > * Wait until master clock is ready (after switching master clock source) > */ > .macro wait_mckrdy > - mov tmp2, #MCKRDY_TIMEOUT > -1: sub tmp2, tmp2, #1 > - cmp tmp2, #0 > - beq 2f > - ldr tmp1, [pmc, #AT91_PMC_SR] > +1: ldr tmp1, [pmc, #AT91_PMC_SR] > tst tmp1, #AT91_PMC_MCKRDY > beq 1b > -2: > .endm > > /* > * Wait until master oscillator has stabilized. > */ > .macro wait_moscrdy > - mov tmp2, #MOSCRDY_TIMEOUT > -1: sub tmp2, tmp2, #1 > - cmp tmp2, #0 > - beq 2f > - ldr tmp1, [pmc, #AT91_PMC_SR] > +1: ldr tmp1, [pmc, #AT91_PMC_SR] > tst tmp1, #AT91_PMC_MOSCS > beq 1b > -2: > .endm > > /* > * Wait until PLLA has locked. > */ > .macro wait_pllalock > - mov tmp2, #PLLALOCK_TIMEOUT > -1: sub tmp2, tmp2, #1 > - cmp tmp2, #0 > - beq 2f > - ldr tmp1, [pmc, #AT91_PMC_SR] > +1: ldr tmp1, [pmc, #AT91_PMC_SR] > tst tmp1, #AT91_PMC_LOCKA > beq 1b > -2: > .endm > > /* > * Wait until PLLB has locked. > */ > .macro wait_pllblock > - mov tmp2, #PLLBLOCK_TIMEOUT > -1: sub tmp2, tmp2, #1 > - cmp tmp2, #0 > - beq 2f > - ldr tmp1, [pmc, #AT91_PMC_SR] > +1: ldr tmp1, [pmc, #AT91_PMC_SR] > tst tmp1, #AT91_PMC_LOCKB > beq 1b > -2: > .endm > > .text > -- Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
