From: Paul Fertser Date: Mon, 10 Oct 2011 07:19:23 +0000 (+0400) Subject: plat-mxc: iomux-v3.h: implicitly enable pull-up/down when that's desired X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6571534;p=linux-beck.git plat-mxc: iomux-v3.h: implicitly enable pull-up/down when that's desired To configure pads during the initialisation a set of special constants is used, e.g. #define MX25_PAD_FEC_MDIO__FEC_MDIO IOMUX_PAD(0x3c4, 0x1cc, 0x10, 0, 0, PAD_CTL_HYS | PAD_CTL_PUS_22K_UP) The problem is that no pull-up/down is getting activated unless both PAD_CTL_PUE (pull-up enable) and PAD_CTL_PKE (pull/keeper module enable) set. This is clearly stated in the i.MX25 datasheet and is confirmed by the measurements on hardware. This leads to some rather hard to understand bugs such as misdetecting an absent ethernet PHY (a real bug i had), unstable data transfer etc. This might affect mx25, mx35, mx50, mx51 and mx53 SoCs. It's reasonable to expect that if the pullup value is specified, the intention was to have it actually active, so we implicitly add the needed bits. Cc: stable@kernel.org Signed-off-by: Paul Fertser Signed-off-by: Sascha Hauer --- diff --git a/arch/arm/plat-mxc/include/mach/iomux-v3.h b/arch/arm/plat-mxc/include/mach/iomux-v3.h index ebbce33097a7..45099566fecc 100644 --- a/arch/arm/plat-mxc/include/mach/iomux-v3.h +++ b/arch/arm/plat-mxc/include/mach/iomux-v3.h @@ -89,11 +89,11 @@ typedef u64 iomux_v3_cfg_t; #define PAD_CTL_HYS (1 << 8) #define PAD_CTL_PKE (1 << 7) -#define PAD_CTL_PUE (1 << 6) -#define PAD_CTL_PUS_100K_DOWN (0 << 4) -#define PAD_CTL_PUS_47K_UP (1 << 4) -#define PAD_CTL_PUS_100K_UP (2 << 4) -#define PAD_CTL_PUS_22K_UP (3 << 4) +#define PAD_CTL_PUE (1 << 6 | PAD_CTL_PKE) +#define PAD_CTL_PUS_100K_DOWN (0 << 4 | PAD_CTL_PUE) +#define PAD_CTL_PUS_47K_UP (1 << 4 | PAD_CTL_PUE) +#define PAD_CTL_PUS_100K_UP (2 << 4 | PAD_CTL_PUE) +#define PAD_CTL_PUS_22K_UP (3 << 4 | PAD_CTL_PUE) #define PAD_CTL_ODE (1 << 3)