From 4925e5e94ae9ff4dda3a59031354b5f4a75d7e41 Mon Sep 17 00:00:00 2001 From: Asmaa Mnebhi Date: Tue, 20 Sep 2022 13:47:29 -0400 Subject: [PATCH] i2c: mlxbf: Fix frequency calculation [ Upstream commit 37f071ec327b04c83d47637c5e5c2199b39899ca ] The i2c-mlxbf.c driver is currently broken because there is a bug in the calculation of the frequency. core_f, core_r and core_od are components read from hardware registers and are used to compute the frequency used to compute different timing parameters. The shifting mechanism used to get core_f, core_r and core_od is wrong. Use FIELD_GET to mask and shift the bitfields properly. Fixes: b5b5b32081cd206b (i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC) Reviewed-by: Khalil Blaiech Signed-off-by: Asmaa Mnebhi Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-mlxbf.c | 63 +++++++++++++--------------------- 1 file changed, 23 insertions(+), 40 deletions(-) diff --git a/drivers/i2c/busses/i2c-mlxbf.c b/drivers/i2c/busses/i2c-mlxbf.c index ac93c0ccf53c..ad5efd7497d1 100644 --- a/drivers/i2c/busses/i2c-mlxbf.c +++ b/drivers/i2c/busses/i2c-mlxbf.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -63,13 +64,14 @@ */ #define MLXBF_I2C_TYU_PLL_OUT_FREQ (400 * 1000 * 1000) /* Reference clock for Bluefield - 156 MHz. */ -#define MLXBF_I2C_PLL_IN_FREQ (156 * 1000 * 1000) +#define MLXBF_I2C_PLL_IN_FREQ 156250000ULL /* Constant used to determine the PLL frequency. */ -#define MLNXBF_I2C_COREPLL_CONST 16384 +#define MLNXBF_I2C_COREPLL_CONST 16384ULL + +#define MLXBF_I2C_FREQUENCY_1GHZ 1000000000ULL /* PLL registers. */ -#define MLXBF_I2C_CORE_PLL_REG0 0x0 #define MLXBF_I2C_CORE_PLL_REG1 0x4 #define MLXBF_I2C_CORE_PLL_REG2 0x8 @@ -181,22 +183,15 @@ #define MLXBF_I2C_COREPLL_FREQ MLXBF_I2C_TYU_PLL_OUT_FREQ /* Core PLL TYU configuration. */ -#define MLXBF_I2C_COREPLL_CORE_F_TYU_MASK GENMASK(12, 0) -#define MLXBF_I2C_COREPLL_CORE_OD_TYU_MASK GENMASK(3, 0) -#define MLXBF_I2C_COREPLL_CORE_R_TYU_MASK GENMASK(5, 0) - -#define MLXBF_I2C_COREPLL_CORE_F_TYU_SHIFT 3 -#define MLXBF_I2C_COREPLL_CORE_OD_TYU_SHIFT 16 -#define MLXBF_I2C_COREPLL_CORE_R_TYU_SHIFT 20 +#define MLXBF_I2C_COREPLL_CORE_F_TYU_MASK GENMASK(15, 3) +#define MLXBF_I2C_COREPLL_CORE_OD_TYU_MASK GENMASK(19, 16) +#define MLXBF_I2C_COREPLL_CORE_R_TYU_MASK GENMASK(25, 20) /* Core PLL YU configuration. */ #define MLXBF_I2C_COREPLL_CORE_F_YU_MASK GENMASK(25, 0) #define MLXBF_I2C_COREPLL_CORE_OD_YU_MASK GENMASK(3, 0) -#define MLXBF_I2C_COREPLL_CORE_R_YU_MASK GENMASK(5, 0) +#define MLXBF_I2C_COREPLL_CORE_R_YU_MASK GENMASK(31, 26) -#define MLXBF_I2C_COREPLL_CORE_F_YU_SHIFT 0 -#define MLXBF_I2C_COREPLL_CORE_OD_YU_SHIFT 1 -#define MLXBF_I2C_COREPLL_CORE_R_YU_SHIFT 26 /* Core PLL frequency. */ static u64 mlxbf_i2c_corepll_frequency; @@ -479,8 +474,6 @@ static struct mutex mlxbf_i2c_bus_lock; #define MLXBF_I2C_MASK_8 GENMASK(7, 0) #define MLXBF_I2C_MASK_16 GENMASK(15, 0) -#define MLXBF_I2C_FREQUENCY_1GHZ 1000000000 - /* * Function to poll a set of bits at a specific address; it checks whether * the bits are equal to zero when eq_zero is set to 'true', and not equal @@ -1410,24 +1403,19 @@ static int mlxbf_i2c_init_master(struct platform_device *pdev, return 0; } -static u64 mlxbf_calculate_freq_from_tyu(struct mlxbf_i2c_resource *corepll_res) +static u64 mlxbf_i2c_calculate_freq_from_tyu(struct mlxbf_i2c_resource *corepll_res) { - u64 core_frequency, pad_frequency; + u64 core_frequency; u8 core_od, core_r; u32 corepll_val; u16 core_f; - pad_frequency = MLXBF_I2C_PLL_IN_FREQ; - corepll_val = readl(corepll_res->io + MLXBF_I2C_CORE_PLL_REG1); /* Get Core PLL configuration bits. */ - core_f = rol32(corepll_val, MLXBF_I2C_COREPLL_CORE_F_TYU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_F_TYU_MASK; - core_od = rol32(corepll_val, MLXBF_I2C_COREPLL_CORE_OD_TYU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_OD_TYU_MASK; - core_r = rol32(corepll_val, MLXBF_I2C_COREPLL_CORE_R_TYU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_R_TYU_MASK; + core_f = FIELD_GET(MLXBF_I2C_COREPLL_CORE_F_TYU_MASK, corepll_val); + core_od = FIELD_GET(MLXBF_I2C_COREPLL_CORE_OD_TYU_MASK, corepll_val); + core_r = FIELD_GET(MLXBF_I2C_COREPLL_CORE_R_TYU_MASK, corepll_val); /* * Compute PLL output frequency as follow: @@ -1439,31 +1427,26 @@ static u64 mlxbf_calculate_freq_from_tyu(struct mlxbf_i2c_resource *corepll_res) * Where PLL_OUT_FREQ and PLL_IN_FREQ refer to CoreFrequency * and PadFrequency, respectively. */ - core_frequency = pad_frequency * (++core_f); + core_frequency = MLXBF_I2C_PLL_IN_FREQ * (++core_f); core_frequency /= (++core_r) * (++core_od); return core_frequency; } -static u64 mlxbf_calculate_freq_from_yu(struct mlxbf_i2c_resource *corepll_res) +static u64 mlxbf_i2c_calculate_freq_from_yu(struct mlxbf_i2c_resource *corepll_res) { u32 corepll_reg1_val, corepll_reg2_val; - u64 corepll_frequency, pad_frequency; + u64 corepll_frequency; u8 core_od, core_r; u32 core_f; - pad_frequency = MLXBF_I2C_PLL_IN_FREQ; - corepll_reg1_val = readl(corepll_res->io + MLXBF_I2C_CORE_PLL_REG1); corepll_reg2_val = readl(corepll_res->io + MLXBF_I2C_CORE_PLL_REG2); /* Get Core PLL configuration bits */ - core_f = rol32(corepll_reg1_val, MLXBF_I2C_COREPLL_CORE_F_YU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_F_YU_MASK; - core_r = rol32(corepll_reg1_val, MLXBF_I2C_COREPLL_CORE_R_YU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_R_YU_MASK; - core_od = rol32(corepll_reg2_val, MLXBF_I2C_COREPLL_CORE_OD_YU_SHIFT) & - MLXBF_I2C_COREPLL_CORE_OD_YU_MASK; + core_f = FIELD_GET(MLXBF_I2C_COREPLL_CORE_F_YU_MASK, corepll_reg1_val); + core_r = FIELD_GET(MLXBF_I2C_COREPLL_CORE_R_YU_MASK, corepll_reg1_val); + core_od = FIELD_GET(MLXBF_I2C_COREPLL_CORE_OD_YU_MASK, corepll_reg2_val); /* * Compute PLL output frequency as follow: @@ -1475,7 +1458,7 @@ static u64 mlxbf_calculate_freq_from_yu(struct mlxbf_i2c_resource *corepll_res) * Where PLL_OUT_FREQ and PLL_IN_FREQ refer to CoreFrequency * and PadFrequency, respectively. */ - corepll_frequency = (pad_frequency * core_f) / MLNXBF_I2C_COREPLL_CONST; + corepll_frequency = (MLXBF_I2C_PLL_IN_FREQ * core_f) / MLNXBF_I2C_COREPLL_CONST; corepll_frequency /= (++core_r) * (++core_od); return corepll_frequency; @@ -2183,14 +2166,14 @@ static struct mlxbf_i2c_chip_info mlxbf_i2c_chip[] = { [1] = &mlxbf_i2c_corepll_res[MLXBF_I2C_CHIP_TYPE_1], [2] = &mlxbf_i2c_gpio_res[MLXBF_I2C_CHIP_TYPE_1] }, - .calculate_freq = mlxbf_calculate_freq_from_tyu + .calculate_freq = mlxbf_i2c_calculate_freq_from_tyu }, [MLXBF_I2C_CHIP_TYPE_2] = { .type = MLXBF_I2C_CHIP_TYPE_2, .shared_res = { [0] = &mlxbf_i2c_corepll_res[MLXBF_I2C_CHIP_TYPE_2] }, - .calculate_freq = mlxbf_calculate_freq_from_yu + .calculate_freq = mlxbf_i2c_calculate_freq_from_yu } }; -- 2.45.0