INDEX register has to be set to '0' before reading CONFIGDATA register which is only present in TI musb platforms.
Currently the default register access mode is set to FLAT_MODE thus INDEX register is not getting set properly with musb_ep_select() which is just a nop operation in FLAT_MODE.This invalid register read is causing module reinset failure. Fixing the issue by moving INDEX register write part to musb_read_configdata() function itself. Signed-off-by: Vikram Pandita <vikram.pandita at ti.com> Signed-off-by: Anand Gadiyar <[email protected]> Signed-off-by: Ajay Kumar Gupta <[email protected]> --- Based on a previous patch from Anand at, http://marc.info/?l=linux-omap&m=122051303604377&w=2 Another version of this fix by Vikram is at, http://linux.omap.com/pipermail/linux-omap-open-source/2007-November/012084.html drivers/usb/musb/musb_core.c | 1 - drivers/usb/musb/musb_regs.h | 1 + 2 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 554a414..3ec68a1 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -1326,7 +1326,6 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb) int i; /* log core options (read using indexed model) */ - musb_ep_select(mbase, 0); reg = musb_read_configdata(mbase); strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8"); diff --git a/drivers/usb/musb/musb_regs.h b/drivers/usb/musb/musb_regs.h index de3b2f1..fbfd3fd 100644 --- a/drivers/usb/musb/musb_regs.h +++ b/drivers/usb/musb/musb_regs.h @@ -323,6 +323,7 @@ static inline void musb_write_rxfifoadd(void __iomem *mbase, u16 c_off) static inline u8 musb_read_configdata(void __iomem *mbase) { + musb_writeb(mbase, MUSB_INDEX, 0); return musb_readb(mbase, 0x10 + MUSB_CONFIGDATA); } -- 1.6.2.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
