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spi: sprd: fill offset only to RD_CMD register for reading from slave device

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RD_CMD can accept slave address offset only, higher bits are reserved.
Writing the whole slave address including slave base seems unnecessary.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lore.kernel.org/r/20210824070212.2089255-3-zhang.lyra@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chunyan Zhang 2021-08-24 15:02:12 +08:00 committed by Mark Brown
parent 2b961c51f4
commit f674aacd50
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 6 deletions
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11
drivers/spi/spi-sprd-adi.c
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@ -159,7 +159,7 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg, u32 *read_val)
{
int read_timeout = ADI_READ_TIMEOUT;
unsigned long flags;
u32 val, rd_addr, paddr;
u32 val, rd_addr;
int ret = 0;
if (sadi->hwlock) {
@ -177,11 +177,10 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg, u32 *read_val)
goto out;
/*
* Set the physical register address need to read into RD_CMD register,
* Set the slave address offset need to read into RD_CMD register,
* then ADI controller will start to transfer automatically.
*/
paddr = sadi->slave_pbase + reg;
writel_relaxed(paddr, sadi->base + REG_ADI_RD_CMD);
writel_relaxed(reg, sadi->base + REG_ADI_RD_CMD);
/*
* Wait read operation complete, the BIT_RD_CMD_BUSY will be set
@ -211,9 +210,9 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg, u32 *read_val)
*/
rd_addr = (val & RD_ADDR_MASK) >> RD_ADDR_SHIFT;
if (rd_addr != (paddr & REG_ADDR_LOW_MASK)) {
if (rd_addr != (reg & REG_ADDR_LOW_MASK)) {
dev_err(sadi->dev, "read error, reg addr = 0x%x, val = 0x%x\n",
paddr, val);
reg, val);
ret = -EIO;
goto out;
}