This erratum requires setting GLITCH_EN bit in debug register.
Signed-off-by: York Sun yorksun@freescale.com CC: Heiko Schocher hs@denx.de
---
Changes in v5: None Changes in v4: None Changes in v3: None Changes in v2: Add comment to I2C workaround
arch/arm/cpu/armv8/fsl-lsch3/soc.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/arch/arm/cpu/armv8/fsl-lsch3/soc.c b/arch/arm/cpu/armv8/fsl-lsch3/soc.c index ca00108..7cbf43c 100644 --- a/arch/arm/cpu/armv8/fsl-lsch3/soc.c +++ b/arch/arm/cpu/armv8/fsl-lsch3/soc.c @@ -37,11 +37,45 @@ static void erratum_rcw_src(void) #endif }
+#define I2C_DEBUG_REG 0x6 +#define I2C_GLITCH_EN 0x8 +/* + * This erratum indicates setting glitch_en bit enables + * digital glitch filter for improved stability. + */ +static void erratum_i2c(void) +{ + u8 __iomem *ptr; +#ifdef CONFIG_SYS_I2C +#ifdef I2C1_BASE_ADDR + ptr = (u8 __iomem *)(I2C1_BASE_ADDR + I2C_DEBUG_REG); + + writeb(I2C_GLITCH_EN, ptr); +#endif +#ifdef I2C2_BASE_ADDR + ptr = (u8 __iomem *)(I2C2_BASE_ADDR + I2C_DEBUG_REG); + + writeb(I2C_GLITCH_EN, ptr); +#endif +#ifdef I2C3_BASE_ADDR + ptr = (u8 __iomem *)(I2C3_BASE_ADDR + I2C_DEBUG_REG); + + writeb(I2C_GLITCH_EN, ptr); +#endif +#ifdef I2C4_BASE_ADDR + ptr = (u8 __iomem *)(I2C4_BASE_ADDR + I2C_DEBUG_REG); + + writeb(I2C_GLITCH_EN, ptr); +#endif +#endif +} + void fsl_lsch3_early_init_f(void) { erratum_a008751(); erratum_rcw_src(); init_early_memctl_regs(); /* tighten IFC timing */ + erratum_i2c(); }
#ifdef CONFIG_SPL_BUILD