Re: [PATCH v2 1/4] ARM: davinci: fix cpufreq registration on da850-evm
From: Adam Ford <hidden>
Date: 2019-03-26 14:00:35
Also in:
linux-arm-kernel, lkml
On Fri, Mar 22, 2019 at 8:31 AM Bartosz Golaszewski [off-list ref] wrote:
From: Bartosz Golaszewski <redacted> The system_rev variable is never set on davinci and is always 0, so we're using the default max operating point of 300MHz. The cvdd supply comes from the tps6507 pmic and the voltage can go all the way to 1.3V so the maximum supported rate should be 456MHz.
My understanding is that only certain revisions of the silicon can go to 456MHz. The L138's Datasheet lists both a 456 and 375 version. I cannot find a way to read a register to determine which version of the silicon is available. Maybe Sekhar can confirm. adam
quoted hunk ↗ jump to hunk
Signed-off-by: Bartosz Golaszewski <redacted> --- arch/arm/mach-davinci/board-da850-evm.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c index 1fdc9283a8c5..58b2a485b527 100644 --- a/arch/arm/mach-davinci/board-da850-evm.c +++ b/arch/arm/mach-davinci/board-da850-evm.c@@ -1155,17 +1155,7 @@ static struct edma_rsv_info *da850_edma_rsv[2] = { #ifdef CONFIG_CPU_FREQ static __init int da850_evm_init_cpufreq(void) { - switch (system_rev & 0xF) { - case 3: - da850_max_speed = 456000; - break; - case 2: - da850_max_speed = 408000; - break; - case 1: - da850_max_speed = 372000; - break; - } + da850_max_speed = 456000; return da850_register_cpufreq("pll0_sysclk3"); } --2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel