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i3c: master: cdns: Update maximum prescaler value for i2c clock 

[ Upstream commit 374c13f908 ]

As per the Cadence IP document fixed the I2C clock divider value limit from
16 bits instead of 10 bits. Without this change setting up the I2C clock to
low frequencies will not work as the prescaler value might be greater than
10 bit number.

I3C clock divider value is 10 bits only. Updating the macro names for both.

Signed-off-by: Harshit Shah <harshitshah.opendev@gmail.com>
Link: https://lore.kernel.org/r/1703927483-28682-1-git-send-email-harshitshah.opendev@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harshit Shah 2023-12-30 14:41:23 +05:30 committed by Greg Kroah-Hartman
parent 0c7478a2da
commit 9b7d253b82
1 changed files with 4 additions and 3 deletions
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7
drivers/i3c/master/i3c-master-cdns.c
View File

@ -77,7 +77,8 @@
#define PRESCL_CTRL0 0x14
#define PRESCL_CTRL0_I2C(x) ((x) << 16)
#define PRESCL_CTRL0_I3C(x) (x)
#define PRESCL_CTRL0_MAX GENMASK(9, 0)
#define PRESCL_CTRL0_I3C_MAX GENMASK(9, 0)
#define PRESCL_CTRL0_I2C_MAX GENMASK(15, 0)
#define PRESCL_CTRL1 0x18
#define PRESCL_CTRL1_PP_LOW_MASK GENMASK(15, 8)
@ -1234,7 +1235,7 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
return -EINVAL;
pres = DIV_ROUND_UP(sysclk_rate, (bus->scl_rate.i3c * 4)) - 1;
if (pres > PRESCL_CTRL0_MAX)
if (pres > PRESCL_CTRL0_I3C_MAX)
return -ERANGE;
bus->scl_rate.i3c = sysclk_rate / ((pres + 1) * 4);
@ -1247,7 +1248,7 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
max_i2cfreq = bus->scl_rate.i2c;
pres = (sysclk_rate / (max_i2cfreq * 5)) - 1;
if (pres > PRESCL_CTRL0_MAX)
if (pres > PRESCL_CTRL0_I2C_MAX)
return -ERANGE;
bus->scl_rate.i2c = sysclk_rate / ((pres + 1) * 5);