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linux: re-add still needed patch

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this fixes some usb tv tuners on usb3 ports
This commit is contained in:
Stefan Saraev 2015-01-26 17:08:08 +02:00
parent 0915ea239a
commit 884da2f0db
1 changed files with 43 additions and 0 deletions
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43
packages/linux/patches/3.18.3/linux-999.04-revert-xhci-Set-scatter-gather-limit.patch vendored Normal file
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@ -0,0 +1,43 @@
From b6d7efd33fd2843fbafe2b2d4b8119b217779a6a Mon Sep 17 00:00:00 2001
From: fritsch <Peter.Fruehberger@gmail.com>
Date: Sat, 3 May 2014 00:08:24 +0200
Subject: [PATCH] Revert "Revert "xhci: Set scatter-gather limit to avoid
failed block writes.""
This reverts commit 47f467ac740ebf0475a5176ddb1741acba6aad4e.
---
drivers/usb/host/xhci.c | 4 ++--
drivers/usb/host/xhci.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 5a646a6..cfa5995 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4716,8 +4716,8 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
struct device *dev = hcd->self.controller;
int retval;
- /* Accept arbitrarily long scatter-gather lists */
- hcd->self.sg_tablesize = ~0;
+ /* Limit the block layer scatter-gather lists to half a segment. */
+ hcd->self.sg_tablesize = TRBS_PER_SEGMENT / 2;
/* support to build packet from discontinuous buffers */
hcd->self.no_sg_constraint = 1;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 03c74b7..c283cf1 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1260,7 +1260,7 @@ union xhci_trb {
* since the command ring is 64-byte aligned.
* It must also be greater than 16.
*/
-#define TRBS_PER_SEGMENT 64
+#define TRBS_PER_SEGMENT 256
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3)
#define TRB_SEGMENT_SIZE (TRBS_PER_SEGMENT*16)
--
1.9.1