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i3c/master: cmd_v1: Fix the rule for getting i3c mode

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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>
This commit is contained in:
Billy Tsai 2024-08-26 11:38:21 +08:00 committed by Alexandre Belloni
parent 133f67bea5
commit 061dd21ca7
1 changed files with 5 additions and 7 deletions
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12
drivers/i3c/master/mipi-i3c-hci/cmd_v1.c
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@ -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); 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) if (bus->scl_rate.i3c > 8000000)
return MODE_I3C_SDR1; return MODE_I3C_SDR0;
if (bus->scl_rate.i3c > 6000000) if (bus->scl_rate.i3c > 6000000)
return MODE_I3C_SDR2; return MODE_I3C_SDR1;
if (bus->scl_rate.i3c > 4000000) if (bus->scl_rate.i3c > 4000000)
return MODE_I3C_SDR3; return MODE_I3C_SDR2;
if (bus->scl_rate.i3c > 2000000) if (bus->scl_rate.i3c > 2000000)
return MODE_I3C_SDR4; return MODE_I3C_SDR3;
return MODE_I3C_Fm_FmP; return MODE_I3C_SDR4;
} }
static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci) static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci)