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i2c: i2c-cdns: Fix write transaction state

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Start write transfer after loading data to FIFO.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Reviewed-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/f0b3e443daa7758e00dfdcc245cf6b2120b0e907.1646122610.git.michal.simek@xilinx.com
This commit is contained in:
Sai Pavan Boddu 2022-03-01 09:16:51 +01:00 committed by Michal Simek
parent 1bc2a79a4c
commit 94b3f3fc7d
1 changed files with 6 additions and 0 deletions
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6
drivers/i2c/i2c-cdns.c
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@ -251,6 +251,7 @@ static int cdns_i2c_write_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
u8 *cur_data = data;
struct cdns_i2c_regs *regs = i2c_bus->regs;
u32 ret;
bool start = 1;
/* Set the controller in Master transmit mode and clear FIFO */
setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO);
@ -269,6 +270,11 @@ static int cdns_i2c_write_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
while (len-- && !is_arbitration_lost(regs)) {
writel(*(cur_data++), &regs->data);
/* Trigger write only after loading data */
if (start) {
writel(addr, &regs->address);
start = 0;
}
if (len && readl(&regs->transfer_size) == CDNS_I2C_FIFO_DEPTH) {
ret = cdns_i2c_wait(regs, CDNS_I2C_INTERRUPT_COMP |
CDNS_I2C_INTERRUPT_ARBLOST);