[linux-sunxi] Re: Raise DCDC1 Voltage on sun6i?
Hi, On Fri, Nov 28, 2014 at 12:50:29PM +0100, Hans de Goede wrote: Hi ChenYu, On 11/28/2014 10:20 AM, wens Tsai wrote: Hi Hans, Thanks for completing SPL support on the A31. I've managed to boot mainline U-boot on my Hummingbird A31. One issue I ran into is that with DCDC1 set at 3.0V, mmc0 is very unstable in the kernel. All operations timeout and the kernel panics because the rootfs isn't available. Raising the voltage to 3.3V gets rid of the problem, but I'm not sure that is the correct solution. The fex file for the mele boards says dcdc1 should be 3.3V not 3.0V and that makes sense really, since 3.3V is a standard voltage, while 3.0V is not. However the fex file for the Hummingbird says 3.0V and my Mele M9 works fine with the current u-boot setting of 3.0V. I've just booted my M9 into the original firmware and that is actually using 3.3V so changing things to 3.3V does seem to be the right thing. Maxime, I seem to remember you telling me that the Colombus is really using 3.0V. Maxime can you confirm this? Is that routed to the mmc power ? I just checked on the schematics, and while the VCC line is called VCC-3V0, it's indeed said later in this document that it should be set to 3.3V... I'll cross-check that with a multimeter on the board along with your other tests. It could be that 3.0V is enough for the A31 itself, but that on boards which do not have a separate power-supply for the mmc 3.3V is used ? I'm fine with moving to 3.3V, I'm wondering if we should make it configurable like the DLDO# and ALDO# voltages, see drivers/power/Kconfig, with a 3.3V voltage and an override in the Colombus defconfig ? I'm not sure what you're referring to here. All I see is battery drivers. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. signature.asc Description: Digital signature
[linux-sunxi] Re: Raise DCDC1 Voltage on sun6i?
Hi, On Fri, Nov 28, 2014 at 7:50 PM, Hans de Goede hdego...@redhat.com wrote: Hi ChenYu, On 11/28/2014 10:20 AM, wens Tsai wrote: Hi Hans, Thanks for completing SPL support on the A31. I've managed to boot mainline U-boot on my Hummingbird A31. One issue I ran into is that with DCDC1 set at 3.0V, mmc0 is very unstable in the kernel. All operations timeout and the kernel panics because the rootfs isn't available. Raising the voltage to 3.3V gets rid of the problem, but I'm not sure that is the correct solution. The fex file for the mele boards says dcdc1 should be 3.3V not 3.0V and that makes sense really, since 3.3V is a standard voltage, while 3.0V is not. However the fex file for the Hummingbird says 3.0V and my Mele M9 works fine with the current u-boot setting of 3.0V. I've just booted my M9 into the original firmware and that is actually using 3.3V so changing things to 3.3V does seem to be the right thing. Maxime, I seem to remember you telling me that the Colombus is really using 3.0V. Maxime can you confirm this? Is that routed to the mmc power ? It could be that 3.0V is enough for the A31 itself, but that on boards which do not have a separate power-supply for the mmc 3.3V is used ? I'm fine with moving to 3.3V, I'm wondering if we should make it configurable like the DLDO# and ALDO# voltages, see drivers/power/Kconfig, with a 3.3V voltage and an override in the Colombus defconfig ? ChenYu, can you check which voltage the original firmware is actually using ? You should see boot1 printing the voltage, and you can check it from a root shell by doing: This is during boot: U-Boot 2011.09-rc1 (Jun 17 2014 - 17:30:56) Allwinner Technology [ 0.213]version: 1.1.0 [ 0.216]pmbus: ready [ 0.218]PMU: AXP221 [ 0.220]PMU: AXP22x found [ 0.223]PMU: bat ratio = 100 [ 0.226]PMU: dcdc3 1260 [ 0.229]PMU: pll1 1008 Mhz dcdc1_vol = 3000 dcdc2_vol = 1200 dcdc3_vol = 1260 dcdc4_vol = 1200 dcdc5_vol = 1500 aldo1_vol = 3000 aldo2_vol = 1800 aldo3_vol = 3000 eldo3_vol = 1800 cat /sys/class/regulator/regulator.13/name cat /sys/class/regulator/regulator.13/microvolts (The first one is just to check your regulators are numbered the same). This is just a dump of all the regulators from the firmware: axp22_DCDC1 300 enabled axp22_DCDC2 120 enabled axp22_DCDC3 126 enabled axp22_DCDC4 120 enabled axp22_DCDC5 150 enabled axp22_ldoio0 280 disabled axp22_ldoio1 180 enabled axp22_ldo1 300 enabled axp22_ldo2 330 enabled axp22_ldo3 180 enabled axp22_ldo4 300 enabled axp22_ldo570 disabled axp22_ldo670 disabled axp22_ldo7 280 disabled axp22_ldo8 280 enabled axp22_ldo9 150 disabled axp22_ldo10 70 disabled axp22_ldo11 180 disabled axp22_ldo12 110 enabled As you can see it is indeed set to 3.0V. And it does work. So I'm kind of confused. Plus 3.0V doesn't seem to be a valid I/O voltage level for SD/MMC. BTW, I see you're working on RSB support for U-boot. Thanks in advance. ChenYu -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
