6.6-stable review patch. If anyone has any objections, please let me know.
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From: Niklas Neronin niklas.neronin@linux.intel.com
commit 7476a2215c07703db5e95efaa3fc5b9f957b9417 upstream.
Older 0.95 xHCI hosts and some other specific newer hosts require the chain bit to be set for Link TRBs even if the link TRB is not in the middle of a transfer descriptor (TD).
move the checks for all those cases into one xhci_link_chain_quirk() function to clean up and avoid code duplication.
No functional changes.
[skip renaming chain_links flag, reword commit message -Mathias]
Signed-off-by: Niklas Neronin niklas.neronin@linux.intel.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20240626124835.1023046-10-mathias.nyman@linux.inte... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [Shivani: Modified to apply on 6.6.y] Signed-off-by: Shivani Agarwal shivani.agarwal@broadcom.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-mem.c | 10 ++-------- drivers/usb/host/xhci-ring.c | 8 ++------ drivers/usb/host/xhci.h | 7 +++++-- 3 files changed, 9 insertions(+), 16 deletions(-)
--- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -136,10 +136,7 @@ static void xhci_link_rings(struct xhci_ if (!ring || !first || !last) return;
- /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */ - chain_links = !!(xhci_link_trb_quirk(xhci) || - (ring->type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST))); + chain_links = xhci_link_chain_quirk(xhci, ring->type);
next = ring->enq_seg->next; xhci_link_segments(ring->enq_seg, first, ring->type, chain_links); @@ -330,10 +327,7 @@ static int xhci_alloc_segments_for_ring( unsigned int num = 0; bool chain_links;
- /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */ - chain_links = !!(xhci_link_trb_quirk(xhci) || - (type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST))); + chain_links = xhci_link_chain_quirk(xhci, type);
prev = xhci_segment_alloc(xhci, cycle_state, max_packet, num, flags); if (!prev) --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -245,9 +245,7 @@ static void inc_enq(struct xhci_hcd *xhc * AMD 0.96 host, carry over the chain bit of the previous TRB * (which may mean the chain bit is cleared). */ - if (!(ring->type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST)) && - !xhci_link_trb_quirk(xhci)) { + if (!xhci_link_chain_quirk(xhci, ring->type)) { next->link.control &= cpu_to_le32(~TRB_CHAIN); next->link.control |= cpu_to_le32(chain); } @@ -3381,9 +3379,7 @@ static int prepare_ring(struct xhci_hcd /* If we're not dealing with 0.95 hardware or isoc rings * on AMD 0.96 host, clear the chain bit. */ - if (!xhci_link_trb_quirk(xhci) && - !(ep_ring->type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST))) + if (!xhci_link_chain_quirk(xhci, ep_ring->type)) ep_ring->enqueue->link.control &= cpu_to_le32(~TRB_CHAIN); else --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1784,9 +1784,12 @@ static inline void xhci_write_64(struct lo_hi_writeq(val, regs); }
-static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci) + +/* Link TRB chain should always be set on 0.95 hosts, and AMD 0.96 ISOC rings */ +static inline bool xhci_link_chain_quirk(struct xhci_hcd *xhci, enum xhci_ring_type type) { - return xhci->quirks & XHCI_LINK_TRB_QUIRK; + return (xhci->quirks & XHCI_LINK_TRB_QUIRK) || + (type == TYPE_ISOC && (xhci->quirks & XHCI_AMD_0x96_HOST)); }
/* xHCI debugging */