[PATCH 2/6] usb: xhci-mtk: use maximum ESIT payload of endpiont context

Chunfeng Yun
2018-08-29T02:55:14Z

Make use of maximum ESIT payload of endpoint context to calculate
the number of packets to send in each ESIT

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
drivers/usb/host/xhci-mtk-sch.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index fa33d6e..46fe0a2 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -73,12 +73,17 @@ static void setup_sch_info(struct usb_device *udev,
u32 max_burst;
u32 mult;
u32 esit_pkts;
+ u32 max_esit_payload;

ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
ep_interval = CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
max_burst = CTX_TO_MAX_BURST(le32_to_cpu(ep_ctx->ep_info2));
mult = CTX_TO_EP_MULT(le32_to_cpu(ep_ctx->ep_info));
+ max_esit_payload =
+ (CTX_TO_MAX_ESIT_PAYLOAD_HI(
+ le32_to_cpu(ep_ctx->ep_info)) << 16) |
+ CTX_TO_MAX_ESIT_PAYLOAD(le32_to_cpu(ep_ctx->tx_info));

sch_ep->esit = 1 << ep_interval;
sch_ep->offset = 0;
@@ -105,7 +110,15 @@ static void setup_sch_info(struct usb_device *udev,
} else if (udev->speed == USB_SPEED_SUPER) {
/* usb3_r1 spec section4.4.7 & 4.4.8 */
sch_ep->cs_count = 0;
- esit_pkts = (mult + 1) * (max_burst + 1);
+ /*
+ * some device's (d)wBytesPerInterval is set as 0,
+ * then max_esit_payload is 0, so evaluate esit_pkts from
+ * mult and burst
+ */
+ esit_pkts = DIV_ROUND_UP(max_esit_payload, max_packet_size);
+ if (esit_pkts == 0)
+ esit_pkts = (mult + 1) * (max_burst + 1);
+
if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
sch_ep->pkts = esit_pkts;
sch_ep->num_budget_microframes = 1;
--
1.9.1