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| author |   Billy Tsai <billy_tsai@aspeedtech.com> | 2024-08-26 11:38:21 +0800 |
|---|---|---|
| committer |   Alexandre Belloni <alexandre.belloni@bootlin.com> | 2024-09-06 17:36:02 +0200 |
| commit | 061dd21ca712cd7103c26ed77bb4a04d98930981 (patch) | |
| tree | c084ce5ee8f719ccdcb2d6fc23d3ae0b783261ee | |
| parent | i3c: master: cdns: fix module autoloading (diff) | |
| download | wireguard-linux-061dd21ca712cd7103c26ed77bb4a04d98930981.tar.xz wireguard-linux-061dd21ca712cd7103c26ed77bb4a04d98930981.zip | |
i3c/master: cmd_v1: Fix the rule for getting i3c mode
Based on the I3C TCRI specification, the rules for determining the I3C
mode are as follows:
I3C SCL rate > 8MHz: use SDR0, as SDR1 has a maximum data rate of 8MHz
I3C SCL rate > 6MHz: use SDR1, as SDR2 has a maximum data rate of 6MHz
I3C SCL rate > 4MHz: use SDR2, as SDR3 has a maximum data rate of 4MHz
I3C SCL rate > 2MHz: use SDR3, as SDR4 has a maximum data rate of 2MHz
Otherwise, use SDR4
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20240826033821.175591-1-billy_tsai@aspeedtech.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/cmd_v1.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c b/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c index 638b054d6c92..dd636094b07f 100644 --- a/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c +++ b/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c @@ -123,17 +123,15 @@ static enum hci_cmd_mode get_i3c_mode(struct i3c_hci *hci) { struct i3c_bus *bus = i3c_master_get_bus(&hci->master); - if (bus->scl_rate.i3c >= 12500000) - return MODE_I3C_SDR0; if (bus->scl_rate.i3c > 8000000) - return MODE_I3C_SDR1; + return MODE_I3C_SDR0; if (bus->scl_rate.i3c > 6000000) - return MODE_I3C_SDR2; + return MODE_I3C_SDR1; if (bus->scl_rate.i3c > 4000000) - return MODE_I3C_SDR3; + return MODE_I3C_SDR2; if (bus->scl_rate.i3c > 2000000) - return MODE_I3C_SDR4; - return MODE_I3C_Fm_FmP; + return MODE_I3C_SDR3; + return MODE_I3C_SDR4; } static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci) |