* Adam Ford <aford173@xxxxxxxxx> [170126 07:58]: > On Thu, Jan 26, 2017 at 9:40 AM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: > > * Woodruff, Richard <r-woodruff2@xxxxxx> [170126 07:14]: > >> > From: Tony Lindgren [mailto:tony@xxxxxxxxxxx] > >> > Sent: Thursday, January 26, 2017 9:04 AM > >> > >> > Well we do have off mode during idle working for quite a few omap3 based > >> > boards just fine. And nothing prevents adding board specific > >> > >> Sure. > >> > >> > I recall playing with a SDIO WLAN card in MMC1 that I needed something > >> > like this to keep the card enabled during off mode as otherwise VMMC1 > >> > would get scaled down to 1.8V during idle. > >> > >> That seems very possible. As I recall there are 3 power provider groups P1/P2/P3 in that PMIC. Typically the processor is one, a modem is a two, and something like a wlan can be powered on 3. It depends on the board setup. > >> > >> When the processor signals an event to the PMIC it will run the script which then sends commands to each group. Some of the PMICs had a lot of programmable options and could get complex. PMICs typically mated with boards in the last few years tended to be a bit less flexible and they cost-removed the SRAM and just have fixed OTP. > > > > Looking at omap3_wrst_seq[], maybe adding just one of the following lines > > to does the trick for reboot: > > > > TWL_RESOURCE_RESET(RES_VMMC1), > > > > or > > > > TWL_RESOURCE_ON(RES_VMMC1), > > > > Tony - > > Should I try his suggestion or your patch or both? Well whatever works :) We should narrow this down as it sounds like it can affects other devices too booting from MMC. > I am willing to try both. Since there are two options for the > omap3_wrst_seq (TWL_RESOURCE_RESET and TWL_RESOURCE_ON) do you have a > recommendation on which one I should do there? Try the TWL_RESOURCE_RESET(RES_VMMC1) first and then hopefully the bootrom or MLO will be able to power it on after reboot. Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
