Commit 061dd21c authored by Billy Tsai's avatar Billy Tsai Committed by Alexandre Belloni
Browse files

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: default avatarBilly Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20240826033821.175591-1-billy_tsai@aspeedtech.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 133f67be

drivers/i3c/master/mipi-i3c-hci/cmd_v1.c

+5 −7
Original line number Diff line number Diff line
@@ -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_SDR3;

	return MODE_I3C_SDR4;

	return MODE_I3C_Fm_FmP;

}



static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci)