2018-10-23 02:11:16 +00:00
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From 3379ffad8f5b3db47578cc4eadc3c0f22f7547f1 Mon Sep 17 00:00:00 2001
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2018-10-09 01:37:09 +00:00
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From: Hal Emmerich <hal@halemmerich.com>
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Date: Thu, 19 Jul 2018 21:48:08 -0500
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2018-10-11 02:09:39 +00:00
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Subject: [PATCH 9/9] usb: dwc2: disable power_down on rockchip devices
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2018-10-09 01:37:09 +00:00
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The bug would let the usb controller enter partial power down,
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which was formally known as hibernate, upon boot if nothing was plugged
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in to the port. Partial power down couldn't be exited properly, so any
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usb devices plugged in after boot would not be usable.
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Before the name change, params.hibernation was false by default, so
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_dwc2_hcd_suspend() would skip entering hibernation. With the
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rename, _dwc2_hcd_suspend() was changed to use params.power_down
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to decide whether or not to enter partial power down.
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Since params.power_down is non-zero by default, it needs to be set
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to 0 for rockchip devices to restore functionality.
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This bug was reported in the linux-usb thread:
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REGRESSION: usb: dwc2: USB device not seen after boot
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The commit that caused this regression is:
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6d23ee9caa6790aea047f9aca7f3c03cb8d96eb6
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Signed-off-by: Hal Emmerich <hal@halemmerich.com>
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---
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drivers/usb/dwc2/params.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
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2018-10-23 02:11:16 +00:00
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index bf7052e037d6..09292dc977e4 100644
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2018-10-09 01:37:09 +00:00
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--- a/drivers/usb/dwc2/params.c
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+++ b/drivers/usb/dwc2/params.c
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2018-10-23 02:11:16 +00:00
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@@ -81,6 +81,7 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg)
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2018-10-09 01:37:09 +00:00
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p->host_perio_tx_fifo_size = 256;
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p->ahbcfg = GAHBCFG_HBSTLEN_INCR16 <<
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GAHBCFG_HBSTLEN_SHIFT;
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+ p->power_down = 0;
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}
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static void dwc2_set_ltq_params(struct dwc2_hsotg *hsotg)
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--
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2.19.0
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