diff options
| author | Lily Zhang <r58066@freescale.com> | 2011-05-31 17:18:51 +0800 |
|---|---|---|
| committer | Lily Zhang <r58066@freescale.com> | 2011-06-01 13:08:38 +0800 |
| commit | 0a50055e007756e11c743daece804050e6088b6c (patch) | |
| tree | cf764ee640ec6afeb8d937d24ed2067bfadb8c04 /arch | |
| parent | b8541f7483dc7c50f61d7ee2a3cc9348dc1be775 (diff) | |
ENGR00144309 do nothing if the core frequency is not changed
When the system enters low bus frequency mode by executing the
following operations, the system enters dead loop to check
arm_podf_busy bit:
1. Store the rootfs on SD card.
2. type "echo 8 > /proc/sys/kernel/printk"
3. type "echo 1 > /sys/devices/platform/mxc_dvfs_core.0/enable"
4. type "ifconfig eth0 down"
5. type "echo 1 > /sys/class/graphics/fb0/blank"
6. The system enters low bus frequency mode. And it keeps
to print "ARM_PODF still in busy!!!!"
This patch is to do nothing if the core frequency is not changed
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
Signed-off-by: Lily Zhang <r58066@freescale.com>
(cherry picked from commit 8b4f2c07598a9a2bec83b47aca65175b9dab5e66)
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-mxc/dvfs_core.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/arm/plat-mxc/dvfs_core.c b/arch/arm/plat-mxc/dvfs_core.c index a134cae84f14..e10abb2fb938 100644 --- a/arch/arm/plat-mxc/dvfs_core.c +++ b/arch/arm/plat-mxc/dvfs_core.c @@ -255,6 +255,15 @@ static int set_cpu_freq(int wp) podf = cpu_wp_tbl[wp].cpu_podf; gp_volt = cpu_wp_tbl[wp].cpu_voltage; + /* Get ARM_PODF */ + reg = __raw_readl(ccm_base + dvfs_data->ccm_cacrr_offset); + arm_podf = reg & 0x07; + if (podf == arm_podf) { + printk(KERN_DEBUG + "No need to change freq and voltage!!!!\n"); + return 0; + } + /* Change arm_podf only */ /* set ARM_FREQ_SHIFT_DIVIDER */ reg = __raw_readl(ccm_base + dvfs_data->ccm_cdcr_offset); @@ -269,15 +278,6 @@ static int set_cpu_freq(int wp) reg |= CCM_CDCR_ARM_FREQ_SHIFT_DIVIDER; __raw_writel(reg, ccm_base + dvfs_data->ccm_cdcr_offset); - /* Get ARM_PODF */ - reg = __raw_readl(ccm_base + dvfs_data->ccm_cacrr_offset); - arm_podf = reg & 0x07; - if (podf == arm_podf) { - printk(KERN_DEBUG - "No need to change freq and voltage!!!!\n"); - return 0; - } - /* Check if FSVAI indicate freq up */ if (podf < arm_podf) { ret = regulator_set_voltage(core_regulator, |