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67 lines
2.1 KiB
67 lines
2.1 KiB
7 years ago
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From 6ac09efa8f0e189ffe7dd7b0889289de56ee44cc Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Sun, 19 Jan 2014 12:18:03 +0100
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Subject: [PATCH] USB: EHCI: allow limiting ports for ehci-platform
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In the same way as the ohci platform driver allows limiting ports,
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enable the same for ehci. This prevents a mismatch in the available
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ports between ehci/ohci on USB 2.0 controllers.
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This is needed if the USB host controller always reports the maximum
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number of ports regardless of the number of available ports (because
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one might be set to be usb device).
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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drivers/usb/host/ehci-hcd.c | 4 ++++
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drivers/usb/host/ehci-platform.c | 2 ++
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drivers/usb/host/ehci.h | 1 +
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include/linux/usb/ehci_pdriver.h | 1 +
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4 files changed, 8 insertions(+)
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--- a/drivers/usb/host/ehci-hcd.c
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+++ b/drivers/usb/host/ehci-hcd.c
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@@ -678,6 +678,10 @@ int ehci_setup(struct usb_hcd *hcd)
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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+ if (ehci->num_ports) {
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+ ehci->hcs_params &= ~0xf; /* bits 3:0, ports on HC */
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+ ehci->hcs_params |= ehci->num_ports;
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+ }
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ehci->sbrn = HCD_USB2;
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--- a/drivers/usb/host/ehci-platform.c
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+++ b/drivers/usb/host/ehci-platform.c
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@@ -62,6 +62,9 @@ static int ehci_platform_reset(struct us
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ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
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+ if (pdata->num_ports && pdata->num_ports <= 15)
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+ ehci->num_ports = pdata->num_ports;
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+
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if (pdata->pre_setup) {
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retval = pdata->pre_setup(hcd);
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if (retval < 0)
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--- a/drivers/usb/host/ehci.h
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+++ b/drivers/usb/host/ehci.h
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@@ -216,6 +216,7 @@ struct ehci_hcd { /* one per controlle
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u32 command;
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/* SILICON QUIRKS */
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+ unsigned int num_ports;
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unsigned no_selective_suspend:1;
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unsigned has_fsl_port_bug:1; /* FreeScale */
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unsigned has_fsl_hs_errata:1; /* Freescale HS quirk */
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--- a/include/linux/usb/ehci_pdriver.h
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+++ b/include/linux/usb/ehci_pdriver.h
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@@ -42,6 +42,7 @@ struct usb_hcd;
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*/
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struct usb_ehci_pdata {
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int caps_offset;
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+ unsigned int num_ports;
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unsigned has_tt:1;
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unsigned has_synopsys_hc_bug:1;
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unsigned big_endian_desc:1;
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