On 5/7/24 13:55, Dmitry Baryshkov wrote:
On Tue, 7 May 2024 at 14:43, Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> wrote:
On 5/2/24 15:12, Dmitry Baryshkov wrote:
On Thu, 2 May 2024 at 15:33, Udipto Goswami <quic_ugoswami@xxxxxxxxxxx> wrote:
The Femto phy depends on 0.88/ 1.8/ 3.3V regulators for its operation.
If one of the regulators is not voted to the required minimum voltage
for phy to operate, then High speed mode of operation will fail.
On certain targets like (qcm6490_rb3gen2) where the minimum voltage
of the regulator is lower than the operating voltage of the phy.
If not voted properly, the phy supply would be limited to the min value
of the LDO thereby rendering the phy non-operational.
The current implementation of the regulators in the Femto PHY is not
setting the load and voltage for each LDO. The appropriate voltages and
loads required for the PHY to operate should be set.
Please move min/max voltages to the DTS. There is no need to set them
from the driver.
Also, is there any reason why you can't use `regulator-initial-mode =
<RPMH_REGULATOR_MODE_HPM>;` like other boards do?
The point is to aggregate the values and switch to HPM if a threshold is
crossed (or stay in LPM otherwise)
I see that other boards use regulator-initial-mode for the USB PHY
regulators. Are we going to change all of them too?
Not sure about initial mode yet.
Also note, that while the combo QMP driver sets the loads, the pure
USB QMP PHY driver doesn't set the loads. This way we can end up with
the undervolted PHY.
Sounds like something to fix, then
Konrad
