On Tue, Apr 16, 2019 at 4:40 PM Robin Murphy <robin.murphy@xxxxxxx> wrote: > > On 16/04/2019 11:56, Jagan Teki wrote: > > sdmmc cd pin is configured as RK_FUNC_GPIO which is wrong and > > indeed failed to detect the sdcard on the board with below error > > > > Card did not respond to voltage select! > > > > So, fix it by replacing RK_FUNC_GPIO with RK_FUNC_1 which > > is already defined in rk3399.dts so make use of same like > > other boards. > > I guess the U-Boot dwmmc driver doesn't support using a GPIO? The reason > we do this for Linux is that the dedicated function is not compatible > with runtime power management - once we see that no card is present and > suspend the idle controller, the CD logic is also powered off and thus > no longer capable of generating the interrupt necessary to wake > everything up again. The GPIO function of the same pin, however, is in > an always-on power domain so is able to do the right thing. I can see these gpio pins were managed via drivers/pinctrl/rockchip/pinctrl-rk3399.c and drivers/gpio/rk_gpio.c . On the other hand other boards do use RKFUNC_1 for CD pin(even in Linux) but what is different in nanopi4? do other boards are yet to change? _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
