[PATCH v2 04/21] ARM: tegra: clock: Don't use PLL lock bits

Colin Cross
2011-02-19T22:28:33Z

The PLL lock bits are not reliable, use per-PLL timeouts instead.

Signed-off-by: Colin Cross <ccross@android.com>
---
arch/arm/mach-tegra/clock.h | 2 +-
arch/arm/mach-tegra/tegra2_clocks.c | 31 +++++++++----------------------
2 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/arch/arm/mach-tegra/clock.h b/arch/arm/mach-tegra/clock.h
index 42f00c0..b76d33d 100644
--- a/arch/arm/mach-tegra/clock.h
+++ b/arch/arm/mach-tegra/clock.h
@@ -53,7 +53,6 @@ struct dvfs_process_id_table {
struct dvfs_table *table;
};

-
struct dvfs {
struct regulator *reg;
struct dvfs_table *table;
@@ -128,6 +127,7 @@ struct clk {
unsigned long vco_min;
unsigned long vco_max;
const struct clk_pll_table *pll_table;
+ int pll_lock_delay;

/* DIV */
u32 div;
diff --git a/arch/arm/mach-tegra/tegra2_clocks.c b/arch/arm/mach-tegra/tegra2_clocks.c
index db27e59..36da2e8 100644
--- a/arch/arm/mach-tegra/tegra2_clocks.c
+++ b/arch/arm/mach-tegra/tegra2_clocks.c
@@ -79,7 +79,6 @@
#define PLL_BASE_ENABLE (1<<30)
#define PLL_BASE_REF_ENABLE (1<<29)
#define PLL_BASE_OVERRIDE (1<<28)
-#define PLL_BASE_LOCK (1<<27)
#define PLL_BASE_DIVP_MASK (0x7<<20)
#define PLL_BASE_DIVP_SHIFT 20
#define PLL_BASE_DIVN_MASK (0x3FF<<8)
@@ -94,7 +93,6 @@
#define PLL_OUT_RESET_DISABLE (1<<0)

#define PLL_MISC(c) (((c)->flags & PLL_ALT_MISC_REG) ? 0x4 : 0xc)
-#define PLL_MISC_LOCK_ENABLE(c) (((c)->flags & PLLU) ? (1<<22) : (1<<18))

#define PLL_MISC_DCCON_SHIFT 20
#define PLL_MISC_CPCON_SHIFT 8
@@ -546,17 +544,7 @@ static struct clk_ops tegra_blink_clk_ops = {
/* PLL Functions */
static int tegra2_pll_clk_wait_for_lock(struct clk *c)
{
- ktime_t before;
-
- before = ktime_get();
-
- while (!(clk_readl(c->reg + PLL_BASE) & PLL_BASE_LOCK)) {
- if (ktime_us_delta(ktime_get(), before) > 5000) {
- pr_err("Timed out waiting for lock bit on pll %s",
- c->name);
- return -1;
- }
- }
+ udelay(c->pll_lock_delay);

return 0;
}
@@ -594,10 +582,6 @@ static int tegra2_pll_clk_enable(struct clk *c)
val |= PLL_BASE_ENABLE;
clk_writel(val, c->reg + PLL_BASE);

- val = clk_readl(c->reg + PLL_MISC(c));
- val |= PLL_MISC_LOCK_ENABLE(c);
- clk_writel(val, c->reg + PLL_MISC(c));
-
tegra2_pll_clk_wait_for_lock(c);

return 0;
@@ -1177,6 +1161,7 @@ static struct clk tegra_pll_s = {
.vco_max = 26000000,
.pll_table = tegra_pll_s_table,
.max_rate = 26000000,
+ .pll_lock_delay = 300,
};

static struct clk_mux_sel tegra_clk_m_sel[] = {
@@ -1213,6 +1198,7 @@ static struct clk tegra_pll_c = {
.vco_max = 1400000000,
.pll_table = tegra_pll_c_table,
.max_rate = 600000000,
+ .pll_lock_delay = 300,
};

static struct clk tegra_pll_c_out1 = {
@@ -1251,6 +1237,7 @@ static struct clk tegra_pll_m = {
.vco_max = 1200000000,
.pll_table = tegra_pll_m_table,
.max_rate = 800000000,
+ .pll_lock_delay = 300,
};

static struct clk tegra_pll_m_out1 = {
@@ -1289,6 +1276,7 @@ static struct clk tegra_pll_p = {
.vco_max = 1400000000,
.pll_table = tegra_pll_p_table,
.max_rate = 432000000,
+ .pll_lock_delay = 300,
};

static struct clk tegra_pll_p_out1 = {
@@ -1354,6 +1342,7 @@ static struct clk tegra_pll_a = {
.vco_max = 1400000000,
.pll_table = tegra_pll_a_table,
.max_rate = 56448000,
+ .pll_lock_delay = 300,
};

static struct clk tegra_pll_a_out0 = {
@@ -1399,6 +1388,7 @@ static struct clk tegra_pll_d = {
.vco_max = 1000000000,
.pll_table = tegra_pll_d_table,
.max_rate = 1000000000,
+ .pll_lock_delay = 1000,
};

static struct clk tegra_pll_d_out0 = {
@@ -1431,6 +1421,7 @@ static struct clk tegra_pll_u = {
.vco_max = 960000000,
.pll_table = tegra_pll_u_table,
.max_rate = 480000000,
+ .pll_lock_delay = 1000,
};

static struct clk_pll_table tegra_pll_x_table[] = {
@@ -1493,6 +1484,7 @@ static struct clk tegra_pll_x = {
.vco_max = 1200000000,
.pll_table = tegra_pll_x_table,
.max_rate = 1000000000,
+ .pll_lock_delay = 300,
};

static struct clk_pll_table tegra_pll_e_table[] = {
@@ -1966,7 +1958,6 @@ static u32 clk_rst_suspend[RST_DEVICES_NUM + CLK_OUT_ENB_NUM +
void tegra_clk_suspend(void)
{
unsigned long off, i;
- u32 pllx_misc;
u32 *ctx = clk_rst_suspend;

*ctx++ = clk_readl(OSC_CTRL) & OSC_CTRL_MASK;
@@ -2007,10 +1998,6 @@ void tegra_clk_suspend(void)

*ctx++ = clk_readl(MISC_CLK_ENB);
*ctx++ = clk_readl(CLK_MASK_ARM);
-
- pllx_misc = clk_readl(tegra_pll_x.reg + PLL_MISC(&tegra_pll_x));
- pllx_misc &= ~PLL_MISC_LOCK_ENABLE(&tegra_pll_x);
- clk_writel(pllx_misc, tegra_pll_x.reg + PLL_MISC(&tegra_pll_x));
}

void tegra_clk_resume(void)
--
1.7.3.1