| Message ID | 20181107150441.23383-1-m.szyprowski@samsung.com |
|---|---|
| State | New |
| Headers | show |
| Series | ARM: Exynos: Add TM2 board support | expand |
On Wed, 07 Nov 2018 16:04:41 +0100 Marek Szyprowski <m.szyprowski@samsung.com> wrote: > Some boards use legacy firmware which doesn't properly configure ARM > architected timer registers. This patch adds a workaround to use the > defined COUNTER_FREQUENCY instead of reading its value from the timer > registers. > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> > --- > arch/arm/cpu/armv8/generic_timer.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/cpu/armv8/generic_timer.c > b/arch/arm/cpu/armv8/generic_timer.c index c1706dcec1..5ac62a0a32 > 100644 --- a/arch/arm/cpu/armv8/generic_timer.c > +++ b/arch/arm/cpu/armv8/generic_timer.c > @@ -15,9 +15,13 @@ DECLARE_GLOBAL_DATA_PTR; > */ > unsigned long get_tbclk(void) > { > +#ifndef COUNTER_FREQUENCY > unsigned long cntfrq; > asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq)); > return cntfrq; > +#else > + return COUNTER_FREQUENCY; > +#endif > } > > #ifdef CONFIG_SYS_FSL_ERRATUM_A008585 Have something changed - or there still is no errata for this? The COUNTER_FREQUENCY is declared in include/configs/tm2.h, but shall be moved to Kconfig. Otherwise looks correct. Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
diff --git a/arch/arm/cpu/armv8/generic_timer.c b/arch/arm/cpu/armv8/generic_timer.c index c1706dcec1..5ac62a0a32 100644 --- a/arch/arm/cpu/armv8/generic_timer.c +++ b/arch/arm/cpu/armv8/generic_timer.c @@ -15,9 +15,13 @@ DECLARE_GLOBAL_DATA_PTR; */ unsigned long get_tbclk(void) { +#ifndef COUNTER_FREQUENCY unsigned long cntfrq; asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq)); return cntfrq; +#else + return COUNTER_FREQUENCY; +#endif } #ifdef CONFIG_SYS_FSL_ERRATUM_A008585
Some boards use legacy firmware which doesn't properly configure ARM architected timer registers. This patch adds a workaround to use the defined COUNTER_FREQUENCY instead of reading its value from the timer registers. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- arch/arm/cpu/armv8/generic_timer.c | 4 ++++ 1 file changed, 4 insertions(+)