Commit 1996e6c5 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: EHCI: work around bug in the Philips ISP1562 controller 



This patch (as1556) works around a bug in the Philips ISP1562 EHCI
controller.  Although the controller claims to support frame-list
lengths smaller than the default of 1024 for its periodic schedule, in
fact smaller values don't work.  A new quirk flag is added to indicate
when the bug is present, and if it is then the schedule size is left
at the default value.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 65b8e5cb

drivers/usb/host/ehci-hcd.c

+1 −1
Original line number Diff line number Diff line
@@ -639,7 +639,7 @@ static int ehci_init(struct usb_hcd *hcd) 
	INIT_LIST_HEAD(&ehci->cached_itd_list);

	INIT_LIST_HEAD(&ehci->cached_sitd_list);



	if (HCC_PGM_FRAMELISTLEN(hcc_params)) {

	if (HCC_PGM_FRAMELISTLEN(hcc_params) && !ehci->sched_size_bug) {

		/* periodic schedule size can be smaller than default */

		switch (EHCI_TUNE_FLS) {

		case 0: ehci->periodic_size = 1024; break;

drivers/usb/host/ehci-pci.c

+7 −0
Original line number Diff line number Diff line
@@ -97,6 +97,13 @@ static int ehci_pci_setup(struct usb_hcd *hcd) 
			break;

		}

		break;



	case PCI_VENDOR_ID_PHILIPS:

		/*

		 * Philips controllers set HCC_PGM_FRAMELISTLEN, but

		 * they don't implement schedule sizes shorter than 1024.

		 */

		ehci->sched_size_bug = 1;

	}



	/* cache this readonly data; minimize chip reads */

drivers/usb/host/ehci.h

+1 −0
Original line number Diff line number Diff line
@@ -149,6 +149,7 @@ struct ehci_hcd { /* one per controller */ 
	unsigned		use_dummy_qh:1;	/* AMD Frame List table quirk*/

	unsigned		has_synopsys_hc_bug:1; /* Synopsys HC */

	unsigned		frame_index_bug:1; /* MosChip (AKA NetMos) */

	unsigned		sched_size_bug:1; /* Philips */



	/* required for usb32 quirk */

	#define OHCI_CTRL_HCFS          (3 << 6)

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