[PATCH] clk: rockchip: only enter pll slow-mode directly before reboots on rk3288
Heiko Stübner
heiko.stuebner at collabora.com
Fri Dec 18 10:33:50 PST 2015
As commit 1d33929e2a2b ("clk: rockchip: switch PLLs to slow mode before
reboot for rk3288") states, switching the PLLs to slow-mode is only
necessary when rebooting using the soft-reset done through the CRU.
The dwc2 controllers used create really big number of interrupts in
special constellations involving usb-hubs and their number is so high,
it can even overwhelm the interrupt handler if the cpu-speed os to low.
Right now the PLLs are put into slow-mode in a shutdown syscore_ops
callback which means it happens on all reboots (not only the soft-reset
ones) and even on poweroff actions.
This can result in the system not powering off and getting stuck instead,
so we should move the slow-mode change nearer to the actual reboot action.
For this we introduce the possiblity to also set a callback that gets
called from the restart-handler directly prior to restarting the system
and move the shutdown-callback to this new option.
With this the slow-mode switch is done only on the necessary reboots
and also has a smaller possibility of causing artifacts.
Fixes: 1d33929e2a2b ("clk: rockchip: switch PLLs to slow mode before reboot for rk3288")
Signed-off-by: Heiko Stuebner <heiko.stuebner at collabora.com>
---
drivers/clk/rockchip/clk-rk3036.c | 2 +-
drivers/clk/rockchip/clk-rk3188.c | 2 +-
drivers/clk/rockchip/clk-rk3228.c | 2 +-
drivers/clk/rockchip/clk-rk3288.c | 4 ++--
drivers/clk/rockchip/clk-rk3368.c | 2 +-
drivers/clk/rockchip/clk.c | 7 ++++++-
drivers/clk/rockchip/clk.h | 2 +-
7 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/clk/rockchip/clk-rk3036.c b/drivers/clk/rockchip/clk-rk3036.c
index 75553af..1651f7d 100644
--- a/drivers/clk/rockchip/clk-rk3036.c
+++ b/drivers/clk/rockchip/clk-rk3036.c
@@ -473,6 +473,6 @@ static void __init rk3036_clk_init(struct device_node *np)
rockchip_register_softrst(np, 9, reg_base + RK2928_SOFTRST_CON(0),
ROCKCHIP_SOFTRST_HIWORD_MASK);
- rockchip_register_restart_notifier(RK2928_GLB_SRST_FST);
+ rockchip_register_restart_notifier(RK2928_GLB_SRST_FST, NULL);
}
CLK_OF_DECLARE(rk3036_cru, "rockchip,rk3036-cru", rk3036_clk_init);
diff --git a/drivers/clk/rockchip/clk-rk3188.c b/drivers/clk/rockchip/clk-rk3188.c
index 7836a97..3521f6f 100644
--- a/drivers/clk/rockchip/clk-rk3188.c
+++ b/drivers/clk/rockchip/clk-rk3188.c
@@ -745,7 +745,7 @@ static void __init rk3188_common_clk_init(struct device_node *np)
rockchip_register_softrst(np, 9, reg_base + RK2928_SOFTRST_CON(0),
ROCKCHIP_SOFTRST_HIWORD_MASK);
- rockchip_register_restart_notifier(RK2928_GLB_SRST_FST);
+ rockchip_register_restart_notifier(RK2928_GLB_SRST_FST, NULL);
}
static void __init rk3066a_clk_init(struct device_node *np)
diff --git a/drivers/clk/rockchip/clk-rk3228.c b/drivers/clk/rockchip/clk-rk3228.c
index 87a7e59..981a502 100644
--- a/drivers/clk/rockchip/clk-rk3228.c
+++ b/drivers/clk/rockchip/clk-rk3228.c
@@ -673,6 +673,6 @@ static void __init rk3228_clk_init(struct device_node *np)
rockchip_register_softrst(np, 9, reg_base + RK2928_SOFTRST_CON(0),
ROCKCHIP_SOFTRST_HIWORD_MASK);
- rockchip_register_restart_notifier(RK3228_GLB_SRST_FST);
+ rockchip_register_restart_notifier(RK3228_GLB_SRST_FST, NULL);
}
CLK_OF_DECLARE(rk3228_cru, "rockchip,rk3228-cru", rk3228_clk_init);
diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
index 3ecaa9d..2a6eca0 100644
--- a/drivers/clk/rockchip/clk-rk3288.c
+++ b/drivers/clk/rockchip/clk-rk3288.c
@@ -848,7 +848,6 @@ static void rk3288_clk_shutdown(void)
static struct syscore_ops rk3288_clk_syscore_ops = {
.suspend = rk3288_clk_suspend,
.resume = rk3288_clk_resume,
- .shutdown = rk3288_clk_shutdown,
};
static void __init rk3288_clk_init(struct device_node *np)
@@ -900,7 +899,8 @@ static void __init rk3288_clk_init(struct device_node *np)
rk3288_cru_base + RK3288_SOFTRST_CON(0),
ROCKCHIP_SOFTRST_HIWORD_MASK);
- rockchip_register_restart_notifier(RK3288_GLB_SRST_FST);
+ rockchip_register_restart_notifier(RK3288_GLB_SRST_FST,
+ rk3288_clk_shutdown);
register_syscore_ops(&rk3288_clk_syscore_ops);
}
CLK_OF_DECLARE(rk3288_cru, "rockchip,rk3288-cru", rk3288_clk_init);
diff --git a/drivers/clk/rockchip/clk-rk3368.c b/drivers/clk/rockchip/clk-rk3368.c
index 1faf160..be0ede5 100644
--- a/drivers/clk/rockchip/clk-rk3368.c
+++ b/drivers/clk/rockchip/clk-rk3368.c
@@ -889,6 +889,6 @@ static void __init rk3368_clk_init(struct device_node *np)
rockchip_register_softrst(np, 15, reg_base + RK3368_SOFTRST_CON(0),
ROCKCHIP_SOFTRST_HIWORD_MASK);
- rockchip_register_restart_notifier(RK3368_GLB_SRST_FST);
+ rockchip_register_restart_notifier(RK3368_GLB_SRST_FST, NULL);
}
CLK_OF_DECLARE(rk3368_cru, "rockchip,rk3368-cru", rk3368_clk_init);
diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index be6c7fd..443d6f0 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -341,9 +341,13 @@ void __init rockchip_clk_protect_critical(const char *const clocks[],
}
static unsigned int reg_restart;
+static void (*cb_restart)(void);
static int rockchip_restart_notify(struct notifier_block *this,
unsigned long mode, void *cmd)
{
+ if (cb_restart)
+ cb_restart();
+
writel(0xfdb9, reg_base + reg_restart);
return NOTIFY_DONE;
}
@@ -353,11 +357,12 @@ static struct notifier_block rockchip_restart_handler = {
.priority = 128,
};
-void __init rockchip_register_restart_notifier(unsigned int reg)
+void __init rockchip_register_restart_notifier(unsigned int reg, void (*cb)(void))
{
int ret;
reg_restart = reg;
+ cb_restart = cb;
ret = register_restart_handler(&rockchip_restart_handler);
if (ret)
pr_err("%s: cannot register restart handler, %d\n",
diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
index 01bc372..809ef81 100644
--- a/drivers/clk/rockchip/clk.h
+++ b/drivers/clk/rockchip/clk.h
@@ -503,7 +503,7 @@ void rockchip_clk_register_armclk(unsigned int lookup_id, const char *name,
const struct rockchip_cpuclk_rate_table *rates,
int nrates);
void rockchip_clk_protect_critical(const char *const clocks[], int nclocks);
-void rockchip_register_restart_notifier(unsigned int reg);
+void rockchip_register_restart_notifier(unsigned int reg, void (*cb)(void));
#define ROCKCHIP_SOFTRST_HIWORD_MASK BIT(0)
--
2.6.2
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