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media: ccs: Wait until software reset is done 

Verify the software reset has been completed until proceeding.

The spec does not guarantee a delay but presumably 100 ms should be
enough.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sakari Ailus 2020-10-08 12:09:07 +02:00 committed by Mauro Carvalho Chehab
parent e1988e7ad0
commit 51fc72e541
1 changed files with 15 additions and 0 deletions
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15
drivers/media/i2c/ccs/ccs-core.c
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@ -1553,11 +1553,26 @@ static int ccs_power_on(struct device *dev)
*/
if (!sensor->reset && !sensor->xshutdown) {
u8 retry = 100;
u32 reset;
rval = ccs_write(sensor, SOFTWARE_RESET, CCS_SOFTWARE_RESET_ON);
if (rval < 0) {
dev_err(dev, "software reset failed\n");
goto out_cci_addr_fail;
}
do {
rval = ccs_read(sensor, SOFTWARE_RESET, &reset);
reset = !rval && reset == CCS_SOFTWARE_RESET_OFF;
if (reset)
break;
usleep_range(1000, 2000);
} while (--retry);
if (!reset)
return -EIO;
}
if (sensor->hwcfg.i2c_addr_alt) {