6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pawel Laszczak pawell@cadence.com
commit e5fa8db0be3e8757e8641600c518425a4589b85c upstream.
Streams should flush their TRB cache, re-read TRBs, and start executing TRBs from the beginning of the new dequeue pointer after a 'Set TR Dequeue Pointer' command.
Cadence controllers may fail to start from the beginning of the dequeue TRB as it doesn't clear the Opaque 'RsvdO' field of the stream context during 'Set TR Dequeue' command. This stream context area is where xHC stores information about the last partially executed TD when a stream is stopped. xHC uses this information to resume the transfer where it left mid TD, when the stream is restarted.
Patch fixes this by clearing out all RsvdO fields before initializing new Stream transfer using a 'Set TR Dequeue Pointer' command.
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") cc: stable@vger.kernel.org Signed-off-by: Pawel Laszczak pawell@cadence.com Reviewed-by: Peter Chen peter.chen@kernel.org Link: https://lore.kernel.org/r/PH7PR07MB95386A40146E3EC64086F409DD9D2@PH7PR07MB95... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/cdns3/host.c | 4 +++- drivers/usb/host/xhci-pci.c | 7 +++++++ drivers/usb/host/xhci-ring.c | 14 ++++++++++++++ drivers/usb/host/xhci.h | 1 + 4 files changed, 25 insertions(+), 1 deletion(-)
--- a/drivers/usb/cdns3/host.c +++ b/drivers/usb/cdns3/host.c @@ -62,7 +62,9 @@ static const struct xhci_plat_priv xhci_ .resume_quirk = xhci_cdns3_resume_quirk, };
-static const struct xhci_plat_priv xhci_plat_cdnsp_xhci; +static const struct xhci_plat_priv xhci_plat_cdnsp_xhci = { + .quirks = XHCI_CDNS_SCTX_QUIRK, +};
static int __cdns_host_init(struct cdns *cdns) { --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -78,6 +78,9 @@ #define PCI_DEVICE_ID_ASMEDIA_2142_XHCI 0x2142 #define PCI_DEVICE_ID_ASMEDIA_3242_XHCI 0x3242
+#define PCI_DEVICE_ID_CADENCE 0x17CD +#define PCI_DEVICE_ID_CADENCE_SSP 0x0200 + static const char hcd_name[] = "xhci_hcd";
static struct hc_driver __read_mostly xhci_pci_hc_driver; @@ -473,6 +476,10 @@ static void xhci_pci_quirks(struct devic xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH; }
+ if (pdev->vendor == PCI_DEVICE_ID_CADENCE && + pdev->device == PCI_DEVICE_ID_CADENCE_SSP) + xhci->quirks |= XHCI_CDNS_SCTX_QUIRK; + /* xHC spec requires PCI devices to support D3hot and D3cold */ if (xhci->hci_version >= 0x120) xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW; --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1399,6 +1399,20 @@ static void xhci_handle_cmd_set_deq(stru struct xhci_stream_ctx *ctx = &ep->stream_info->stream_ctx_array[stream_id]; deq = le64_to_cpu(ctx->stream_ring) & SCTX_DEQ_MASK; + + /* + * Cadence xHCI controllers store some endpoint state + * information within Rsvd0 fields of Stream Endpoint + * context. This field is not cleared during Set TR + * Dequeue Pointer command which causes XDMA to skip + * over transfer ring and leads to data loss on stream + * pipe. + * To fix this issue driver must clear Rsvd0 field. + */ + if (xhci->quirks & XHCI_CDNS_SCTX_QUIRK) { + ctx->reserved[0] = 0; + ctx->reserved[1] = 0; + } } else { deq = le64_to_cpu(ep_ctx->deq) & ~EP_CTX_CYCLE_MASK; } --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1628,6 +1628,7 @@ struct xhci_hcd { #define XHCI_ZHAOXIN_TRB_FETCH BIT_ULL(45) #define XHCI_ZHAOXIN_HOST BIT_ULL(46) #define XHCI_WRITE_64_HI_LO BIT_ULL(47) +#define XHCI_CDNS_SCTX_QUIRK BIT_ULL(48)
unsigned int num_active_eps; unsigned int limit_active_eps;