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soc: rockchip: power-domain: avoid infinite loop 

In some cases, we have met the infinite loop in
rockchip_pmu_set_idle_request() or rockchip_do_pmu_set_power_domain().

As the crosbug.com/p/57351 reported, the boot hangs right after this
[1.629163] bootconsole [uart8250] disabled
[1.639286] [drm:drm_core_init] Initialized drm 1.1.0 20060810
[1.645926] [drm:drm_get_platform_dev] Initialized vgem 1.0.0 20120112..
[1.654558] iommu: Adding device ff8f0000.vop to group 0
[1.660569] iommu: Adding device ff900000.vop to group 1
<hang>

This patch adds the error message and timeout to avoid infinite loop if
it fails to get the ack.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Caesar Wang 2016-10-13 02:16:08 +08:00 committed by Heiko Stuebner
parent 3f2fe461c7
commit e4c8cd82d5
1 changed files with 41 additions and 7 deletions
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48
drivers/soc/rockchip/pm_domains.c
View File

@ -9,6 +9,7 @@
*/
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/err.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
@ -105,12 +106,24 @@ static bool rockchip_pmu_domain_is_idle(struct rockchip_pm_domain *pd)
return (val & pd_info->idle_mask) == pd_info->idle_mask;
}
static unsigned int rockchip_pmu_read_ack(struct rockchip_pmu *pmu)
{
unsigned int val;
regmap_read(pmu->regmap, pmu->info->ack_offset, &val);
return val;
}
static int rockchip_pmu_set_idle_request(struct rockchip_pm_domain *pd,
bool idle)
{
const struct rockchip_domain_info *pd_info = pd->info;
struct generic_pm_domain *genpd = &pd->genpd;
struct rockchip_pmu *pmu = pd->pmu;
unsigned int target_ack;
unsigned int val;
bool is_idle;
int ret;
if (pd_info->req_mask == 0)
return 0;
@ -120,12 +133,26 @@ static int rockchip_pmu_set_idle_request(struct rockchip_pm_domain *pd,
dsb(sy);
do {
regmap_read(pmu->regmap, pmu->info->ack_offset, &val);
} while ((val & pd_info->ack_mask) != (idle ? pd_info->ack_mask : 0));
/* Wait util idle_ack = 1 */
target_ack = idle ? pd_info->ack_mask : 0;
ret = readx_poll_timeout_atomic(rockchip_pmu_read_ack, pmu, val,
(val & pd_info->ack_mask) == target_ack,
0, 10000);
if (ret) {
dev_err(pmu->dev,
"failed to get ack on domain '%s', val=0x%x\n",
genpd->name, val);
return ret;
}
while (rockchip_pmu_domain_is_idle(pd) != idle)
cpu_relax();
ret = readx_poll_timeout_atomic(rockchip_pmu_domain_is_idle, pd,
is_idle, is_idle == idle, 0, 10000);
if (ret) {
dev_err(pmu->dev,
"failed to set idle on domain '%s', val=%d\n",
genpd->name, is_idle);
return ret;
}
return 0;
}
@ -198,6 +225,8 @@ static void rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd,
bool on)
{
struct rockchip_pmu *pmu = pd->pmu;
struct generic_pm_domain *genpd = &pd->genpd;
bool is_on;
if (pd->info->pwr_mask == 0)
return;
@ -207,8 +236,13 @@ static void rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd,
dsb(sy);
while (rockchip_pmu_domain_is_on(pd) != on)
cpu_relax();
if (readx_poll_timeout_atomic(rockchip_pmu_domain_is_on, pd, is_on,
is_on == on, 0, 10000)) {
dev_err(pmu->dev,
"failed to set domain '%s', val=%d\n",
genpd->name, is_on);
return;
}
}
static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)