[PATCH 0/2] STM32F4 clock fixes

[PATCH 0/2] STM32F4 clock fixes

[gabriel.fernandez at st.com]

From: Gabriel Fernandez <gabriel.fernandez@st.com>

This patch-set contains 2 fixes.
One concerning exclusion of wrong values for PLLQ (0 & 1)
And the second is a fix about timeout management of PLL and LSE/LSI clocks.

Gabriel Fernandez (2):
  clk: stm32f4: fix: exclude values 0 and 1 for PLLQ
  clk: stm32f4: fix timeout management for pll and ready gate

 drivers/clk/clk-stm32f4.c | 56 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 39 insertions(+), 17 deletions(-)

-- 
1.9.1

[PATCH 1/2] clk: stm32f4: fix: exclude values 0 and 1 for PLLQ

[gabriel.fernandez at st.com]

From: Gabriel Fernandez <gabriel.fernandez@st.com>

0000: PLLQ = 0, wrong configuration
0001: PLLQ = 1, wrong configuration
...
0010: PLLQ = 2
0011: PLLQ = 3
0100: PLLQ = 4
...
1111: PLLQ = 1

Use divider table to exclude 0 and 1 values.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
---
 drivers/clk/clk-stm32f4.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index ab609a7..cf9449b3 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -429,6 +429,13 @@ enum {
 	{ 0, 2 }, { 1, 4 }, { 2, 6 }, { 3, 8 }, { 0 }
 };
 
+static const struct clk_div_table pll_divq_table[] = {
+	{ 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 7, 7 },
+	{ 8, 8 }, { 9, 9 }, { 10, 10 }, { 11, 11 }, { 12, 12 }, { 13, 13 },
+	{ 14, 14 }, { 15, 15 },
+	{ 0 }
+};
+
 static const struct clk_div_table pll_divr_table[] = {
 	{ 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 7, 7 }, { 0 }
 };
@@ -496,9 +503,9 @@ struct stm32f4_div_data {
 
 #define MAX_PLL_DIV 3
 static const struct stm32f4_div_data  div_data[MAX_PLL_DIV] = {
-	{ 16, 2, 0,			pll_divp_table	},
-	{ 24, 4, CLK_DIVIDER_ONE_BASED, NULL		},
-	{ 28, 3, 0,			pll_divr_table	},
+	{ 16, 2, 0, pll_divp_table },
+	{ 24, 4, 0, pll_divq_table },
+	{ 28, 3, 0, pll_divr_table },
 };
 
 struct stm32f4_pll_data {
-- 
1.9.1

[PATCH 2/2] clk: stm32f4: fix timeout management for pll and ready gate

[gabriel.fernandez at st.com]

From: Gabriel Fernandez <gabriel.fernandez@st.com>

Use a classic polling to test bit ready.
And the shift of the bit ready of LSE & LSI were wrongs.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
---
 drivers/clk/clk-stm32f4.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index cf9449b3..68e2a4e 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -531,19 +531,26 @@ static int stm32f4_pll_is_enabled(struct clk_hw *hw)
 	return clk_gate_ops.is_enabled(hw);
 }
 
+#define PLL_TIMEOUT 10000
+
 static int stm32f4_pll_enable(struct clk_hw *hw)
 {
 	struct clk_gate *gate = to_clk_gate(hw);
 	struct stm32f4_pll *pll = to_stm32f4_pll(gate);
-	int ret = 0;
-	unsigned long reg;
+	int bit_status;
+	unsigned int timeout = PLL_TIMEOUT;
 
-	ret = clk_gate_ops.enable(hw);
+	if (clk_gate_ops.is_enabled(hw))
+		return 0;
+
+	clk_gate_ops.enable(hw);
 
-	ret = readl_relaxed_poll_timeout_atomic(base + STM32F4_RCC_CR, reg,
-			reg & (1 << pll->bit_rdy_idx), 0, 10000);
+	do {
+		bit_status = !(readl(gate->reg) & BIT(pll->bit_rdy_idx));
 
-	return ret;
+	} while (bit_status && --timeout);
+
+	return bit_status;
 }
 
 static void stm32f4_pll_disable(struct clk_hw *hw)
@@ -834,24 +841,32 @@ struct stm32_rgate {
 	u8	bit_rdy_idx;
 };
 
-#define RTC_TIMEOUT 1000000
+#define RGATE_TIMEOUT 50000
 
 static int rgclk_enable(struct clk_hw *hw)
 {
 	struct clk_gate *gate = to_clk_gate(hw);
 	struct stm32_rgate *rgate = to_rgclk(gate);
-	u32 reg;
-	int ret;
+	int bit_status;
+	unsigned int timeout = RGATE_TIMEOUT;
+
+	if (clk_gate_ops.is_enabled(hw))
+		return 0;
 
 	disable_power_domain_write_protection();
 
 	clk_gate_ops.enable(hw);
 
-	ret = readl_relaxed_poll_timeout_atomic(gate->reg, reg,
-			reg & rgate->bit_rdy_idx, 1000, RTC_TIMEOUT);
+	do {
+		bit_status = !(readl(gate->reg) & BIT(rgate->bit_rdy_idx));
+		if (bit_status)
+			udelay(100);
+
+	} while (bit_status && --timeout);
 
 	enable_power_domain_write_protection();
-	return ret;
+
+	return bit_status;
 }
 
 static void rgclk_disable(struct clk_hw *hw)
@@ -1533,7 +1548,7 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 	}
 
 	clks[CLK_LSI] = clk_register_rgate(NULL, "lsi", "clk-lsi", 0,
-			base + STM32F4_RCC_CSR, 0, 2, 0, &stm32f4_clk_lock);
+			base + STM32F4_RCC_CSR, 0, 1, 0, &stm32f4_clk_lock);
 
 	if (IS_ERR(clks[CLK_LSI])) {
 		pr_err("Unable to register lsi clock\n");
@@ -1541,7 +1556,7 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 	}
 
 	clks[CLK_LSE] = clk_register_rgate(NULL, "lse", "clk-lse", 0,
-			base + STM32F4_RCC_BDCR, 0, 2, 0, &stm32f4_clk_lock);
+			base + STM32F4_RCC_BDCR, 0, 1, 0, &stm32f4_clk_lock);
 
 	if (IS_ERR(clks[CLK_LSE])) {
 		pr_err("Unable to register lse clock\n");
-- 
1.9.1

[PATCH 0/2] STM32F4 clock fixes

[Stephen Boyd]

On 03/15, gabriel.fernandez at st.com wrote:
> From: Gabriel Fernandez <gabriel.fernandez@st.com>
> 
> This patch-set contains 2 fixes.
> One concerning exclusion of wrong values for PLLQ (0 & 1)
> And the second is a fix about timeout management of PLL and LSE/LSI clocks.

But neither of the patches have a "Fixes" tag. Can you please
indicate what commits they're fixing?

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH 0/2] STM32F4 clock fixes

[Gabriel Fernandez]

Hi Stephen,

On 03/15/2017 09:43 PM, Stephen Boyd wrote:
> On 03/15, gabriel.fernandez at st.com wrote:
>> From: Gabriel Fernandez <gabriel.fernandez@st.com>
>>
>> This patch-set contains 2 fixes.
>> One concerning exclusion of wrong values for PLLQ (0 & 1)
>> And the second is a fix about timeout management of PLL and LSE/LSI clocks.
> But neither of the patches have a "Fixes" tag. Can you please
> indicate what commits they're fixing?
>
Okay i will send a v2 with "Fixes" tags

BR

Gabriel