[PATCH v2 3/4] i2c: imx: use readb_relaxed and writeb_relaxed
From: Stefan Eichenberger <hidden>
Date: 2024-08-19 07:21:00
Also in:
imx, linux-i2c, lkml
Subsystem:
freescale imx i2c driver, i2c subsystem, i2c subsystem host drivers, the rest · Maintainers:
Oleksij Rempel, Andi Shyti, Linus Torvalds
From: Stefan Eichenberger <redacted> Use the relaxed version of readb and writeb to reduce overhead. It is safe to use the relaxed version because we either do not rely on dma completion, or we use a dma callback to ensure that the dma transfer is complete before we continue. Signed-off-by: Stefan Eichenberger <redacted> --- drivers/i2c/busses/i2c-imx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index e242166cb6638..ccb466c50f598 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c@@ -313,13 +313,13 @@ static inline int is_vf610_i2c(struct imx_i2c_struct *i2c_imx) static inline void imx_i2c_write_reg(unsigned int val, struct imx_i2c_struct *i2c_imx, unsigned int reg) { - writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); + writeb_relaxed(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); } static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, unsigned int reg) { - return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); + return readb_relaxed(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); } static void i2c_imx_clear_irq(struct imx_i2c_struct *i2c_imx, unsigned int bits)
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2.43.0