31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
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From 3d8a3a5cbcd4d36768cf53e778d8165aefabd5b0 Mon Sep 17 00:00:00 2001
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From: P33M <P33M@github.com>
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Date: Fri, 20 Sep 2013 16:08:27 +0100
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Subject: [PATCH 093/174] dwc_otg: Enable NAK holdoff for control split
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transactions
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Certain low-speed devices take a very long time to complete a
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data or status stage of a control transaction, producing NAK
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responses until they complete internal processing - the USB2.0
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spec limit is up to 500mS. This causes the same type of interrupt
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storm as seen with USB-serial dongles prior to c8edb238.
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In certain circumstances, usually while booting, this interrupt
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storm could cause SD card timeouts.
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---
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drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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@@ -1857,8 +1857,7 @@ static int32_t handle_hc_nak_intr(dwc_ot
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*/
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switch(dwc_otg_hcd_get_pipe_type(&qtd->urb->pipe_info)) {
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case UE_BULK:
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- //case UE_INTERRUPT:
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- //case UE_CONTROL:
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+ case UE_CONTROL:
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if (nak_holdoff_enable)
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hc->qh->nak_frame = dwc_otg_hcd_get_frame_number(hcd);
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}
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