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| author | Sai Pavan Boddu <sai.pavan.boddu@xilinx.com> | 2022-03-01 09:16:52 +0100 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2022-03-09 12:36:37 +0100 |
| commit | f76f86029d75df2546e734e3ae1a50fa62d72526 (patch) | |
| tree | 775fe9b3f48ca3e242969c0a80915640a2059af6 /drivers/i2c | |
| parent | 94b3f3fc7d5eece585a688061fa7a32a1a1c8495 (diff) | |
| download | u-boot-f76f86029d75df2546e734e3ae1a50fa62d72526.zip u-boot-f76f86029d75df2546e734e3ae1a50fa62d72526.tar.gz u-boot-f76f86029d75df2546e734e3ae1a50fa62d72526.tar.bz2 | |
i2c: i2c-cdns: Prevent early termination of write
During sequential loading of data, hold the bus to prevent controller
from sending stop signal in case no data is available in 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/2407b39d305999cb42438c5423aebc3b514acabb.1646122610.git.michal.simek@xilinx.com
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-cdns.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/i2c/i2c-cdns.c b/drivers/i2c/i2c-cdns.c index 07d53be..0da9f6f 100644 --- a/drivers/i2c/i2c-cdns.c +++ b/drivers/i2c/i2c-cdns.c @@ -257,16 +257,18 @@ static int cdns_i2c_write_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data, setbits_le32(®s->control, CDNS_I2C_CONTROL_CLR_FIFO); clrbits_le32(®s->control, CDNS_I2C_CONTROL_RW); - /* Check message size against FIFO depth, and set hold bus bit - * if it is greater than FIFO depth + /* + * For sequential data load hold the bus. */ - if (len > CDNS_I2C_FIFO_DEPTH) + if (len > 1) setbits_le32(®s->control, CDNS_I2C_CONTROL_HOLD); /* Clear the interrupts in status register */ writel(CDNS_I2C_INTERRUPTS_MASK, ®s->interrupt_status); - writel(addr, ®s->address); + /* In case of Probe (i.e no data), start the transfer */ + if (!len) + writel(addr, ®s->address); while (len-- && !is_arbitration_lost(regs)) { writel(*(cur_data++), ®s->data); |