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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org >> >> Our internal power grid documents list the regulators as >> >> VDD_A_*_1P2 and VDD_A_*_0P9 for all the platforms. >> > >> >Do your internal power grid documents indicate what these supplies >> >are powering? The question is if these supplies power any of the >> >logic inside the eDP controller or if they only supply power to the >> >analog circuits in the eDP phy. If it's the eDP phy only then the >> >regulator usage in the eDP driver should be removed. I would suspect >> >this is the case because the controller is probably all digital logic >> >and runs at the typical 1.8V that the rest of the SoC uses. >> >Similarly, these are voltage references which sound like a PLL reference >voltage. >> > >> >Please clarify this further. >> > >> >> For the DP driver using the usb-dp combo phy, there were cases where >> the usb driver was turning off the phy and pll regulators whenever usb-dp >concurrent mode need not be supported. >> This caused phy and pll to be powered down causing aux transaction failures >and display blankouts. >> From then on, it became a practice for the controller driver to vote for the >phy and pll regulators also. >> > >That sounds like USB-DP combo phy driver had improper regulator power >management where aux transactions from DP didn't keep the power on to >the phy. Where does the power physically go? If the power isn't physically >going to the DP controller it shouldn't be controlled from the DP controller >driver. If the aux bus needs the DP phy enabled, the DP controller driver >should enable the phy power (via phy_power_on()?). Yes, it was limitation earlier when we did not have proper interface to interact with the combo phy. In this case, the power from the regulators go to the combo phy. Now that there is an interface for the controller to interact with the combo phy, the proposal to drop the phy regulator voting from the controller driver seems reasonable to me. The phy_power_on() is used for getting the phy out of low power state or getting it ready for data transfer. The controller driver needs to enable the phy power via the phy_init() before any interaction with the sink like the aux transactions or before sending the data. The controller can disable the regulators via the phy_exit() call. Thank you, Sankeerth -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy