iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: exynos5: Preserve high speed master code

Browse Source 
When the driver starts to send a message with the MASTER_ID field
set (high speed), the whole I2C_ADDR register is overwritten including
MASTER_ID as the SLV_ADDR_MAS field is set.

This patch preserves already written fields in I2C_ADDR when writing
SLV_ADDR_MAS.

Fixes: 8a73cd4cfa15 ("i2c: exynos5: add High Speed I2C controller driver")
Signed-off-by: Mårten Lindahl <martenli@axis.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Mårten Lindahl 2021-02-16 23:25:38 +01:00 committed by Wolfram Sang
parent e87cc183cb
commit f4ff0104d4
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/i2c/busses/i2c-exynos5.c
View File

@ -606,6 +606,7 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
u32 i2c_ctl;
u32 int_en = 0;
u32 i2c_auto_conf = 0;
u32 i2c_addr = 0;
u32 fifo_ctl;
unsigned long flags;
unsigned short trig_lvl;
@ -640,7 +641,12 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
int_en |= HSI2C_INT_TX_ALMOSTEMPTY_EN;
}
writel(HSI2C_SLV_ADDR_MAS(i2c->msg->addr), i2c->regs + HSI2C_ADDR);
i2c_addr = HSI2C_SLV_ADDR_MAS(i2c->msg->addr);
if (i2c->op_clock >= I2C_MAX_FAST_MODE_PLUS_FREQ)
i2c_addr |= HSI2C_MASTER_ID(MASTER_ID(i2c->adap.nr));
writel(i2c_addr, i2c->regs + HSI2C_ADDR);
writel(fifo_ctl, i2c->regs + HSI2C_FIFO_CTL);
writel(i2c_ctl, i2c->regs + HSI2C_CTL);