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authorMathias Nyman <mathias.nyman@linux.intel.com>2015-02-24 18:27:01 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-02-24 08:34:32 -0800
commit6596a926b0b6c80b730a1dd2fa91908e0a539c37 (patch)
treea6560e66d216dd7e579d986e9f139d4d097ad7f8 /drivers/usb/host
parent1e7e4fb66489cc84366656ca5318f1cb61afd4ba (diff)
xhci: Allocate correct amount of scratchpad buffers
Include the high order bit fields for Max scratchpad buffers when calculating how many scratchpad buffers are needed. I'm suprised this hasn't caused more issues, we never allocated more than 32 buffers even if xhci needed more. Either we got lucky and xhci never really used past that area, or then we got enough zeroed dma memory anyway. Should be backported as far back as possible Reported-by: Tim Chen <tim.c.chen@linux.intel.com> Tested-by: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/xhci.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 974514762a14..68956b13b8d1 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -88,9 +88,10 @@ struct xhci_cap_regs {
#define HCS_IST(p) (((p) >> 0) & 0xf)
/* bits 4:7, max number of Event Ring segments */
#define HCS_ERST_MAX(p) (((p) >> 4) & 0xf)
+/* bits 21:25 Hi 5 bits of Scratchpad buffers SW must allocate for the HW */
/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
-/* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
-#define HCS_MAX_SCRATCHPAD(p) (((p) >> 27) & 0x1f)
+/* bits 27:31 Lo 5 bits of Scratchpad buffers SW must allocate for the HW */
+#define HCS_MAX_SCRATCHPAD(p) ((((p) >> 16) & 0x3e0) | (((p) >> 27) & 0x1f))
/* HCSPARAMS3 - hcs_params3 - bitmasks */
/* bits 0:7, Max U1 to U0 latency for the roothub ports */