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authorAlan Stern <stern@rowland.harvard.edu>2011-11-17 16:41:45 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-18 14:18:45 -0500
commitc61875977458637226ab093a35d200f2d5789787 (patch)
tree8599601ac6abc0532f11858d572119d260d9925c /drivers/usb/host/ohci.h
parent46b5a277ed90317a4d17e936c16037e76011b219 (diff)
OHCI: final fix for NVIDIA problems (I hope)
Problems with NVIDIA's OHCI host controllers persist. After looking carefully through the spec, I finally realized that when a controller is reset it then automatically goes into a SUSPEND state in which it is completely quiescent (no DMA and no IRQs) and from which it will not awaken until the system puts it into the OPERATIONAL state. Therefore there's no need to worry about controllers being in the RESET state for extended periods, or remaining in the OPERATIONAL state during system shutdown. The proper action for device initialization is to put the controller into the RESET state (if it's not there already) and then to issue a software reset. Similarly, the proper action for device shutdown is simply to do a software reset. This patch (as1499) implements such an approach. It simplifies initialization and shutdown, and allows the NVIDIA shutdown-quirk code to be removed. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Andre "Osku" Schmidt <andre.osku.schmidt@googlemail.com> Tested-by: Arno Augustin <Arno.Augustin@web.de> Cc: stable <stable@vger.kernel.org> [after tested in 3.2 for a while] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ohci.h')
-rw-r--r--drivers/usb/host/ohci.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 35e5fd640ce7..0795b934d00c 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -403,7 +403,6 @@ struct ohci_hcd {
403#define OHCI_QUIRK_HUB_POWER 0x100 /* distrust firmware power/oc setup */ 403#define OHCI_QUIRK_HUB_POWER 0x100 /* distrust firmware power/oc setup */
404#define OHCI_QUIRK_AMD_PLL 0x200 /* AMD PLL quirk*/ 404#define OHCI_QUIRK_AMD_PLL 0x200 /* AMD PLL quirk*/
405#define OHCI_QUIRK_AMD_PREFETCH 0x400 /* pre-fetch for ISO transfer */ 405#define OHCI_QUIRK_AMD_PREFETCH 0x400 /* pre-fetch for ISO transfer */
406#define OHCI_QUIRK_SHUTDOWN 0x800 /* nVidia power bug */
407 // there are also chip quirks/bugs in init logic 406 // there are also chip quirks/bugs in init logic
408 407
409 struct work_struct nec_work; /* Worker for NEC quirk */ 408 struct work_struct nec_work; /* Worker for NEC quirk */