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139 lines
5.4 KiB
Diff
139 lines
5.4 KiB
Diff
From c5c72d252dc8e417388386d5767ea790ee8f5b44 Mon Sep 17 00:00:00 2001
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From: Adam Wallis <awallis@codeaurora.org>
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Date: Fri, 8 Dec 2017 17:59:13 +0200
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Subject: [PATCH 191/224] usb: xhci: allow imod-interval to be configurable
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The xHCI driver currently has the IMOD set to 160, which
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translates to an IMOD interval of 40,000ns (160 * 250)ns
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Commit 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
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introduced a QUIRK for the MTK platform to adjust this interval to 20,
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which translates to an IMOD interval of 5,000ns (20 * 250)ns. This is
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due to the fact that the MTK controller IMOD interval is 8 times
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as much as defined in xHCI spec.
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Instead of adding more quirk bits for additional platforms, this patch
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introduces the ability for vendors to set the IMOD_INTERVAL as is
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optimal for their platform. By using device_property_read_u32() on
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"imod-interval-ns", the IMOD INTERVAL can be specified in nano seconds.
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If no interval is specified, the default of 40,000ns (IMOD=160) will be
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used.
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No bounds checking has been implemented due to the fact that a vendor
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may have violated the spec and would need to specify a value outside of
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the max 8,000 IRQs/second limit specified in the xHCI spec.
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Tested-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
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Reviewed-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Adam Wallis <awallis@codeaurora.org>
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Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt | 2 ++
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Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 +
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drivers/usb/host/xhci-mtk.c | 9 +++++++++
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drivers/usb/host/xhci-pci.c | 3 +++
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drivers/usb/host/xhci-plat.c | 5 +++++
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drivers/usb/host/xhci.c | 6 +-----
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drivers/usb/host/xhci.h | 2 ++
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7 files changed, 23 insertions(+), 5 deletions(-)
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--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
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+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
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@@ -46,6 +46,7 @@ Optional properties:
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- pinctrl-names : a pinctrl state named "default" must be defined
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- pinctrl-0 : pin control group
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See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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+ - imod-interval-ns: default interrupt moderation interval is 5000ns
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Example:
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usb30: usb@11270000 {
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@@ -66,6 +67,7 @@ usb30: usb@11270000 {
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usb3-lpm-capable;
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mediatek,syscon-wakeup = <&pericfg>;
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mediatek,wakeup-src = <1>;
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+ imod-interval-ns = <10000>;
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};
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2nd: dual-role mode with xHCI driver
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--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
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+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
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@@ -29,6 +29,7 @@ Optional properties:
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- clocks: reference to a clock
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- usb3-lpm-capable: determines if platform is USB3 LPM capable
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- quirk-broken-port-ped: set if the controller has broken port disable mechanism
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+ - imod-interval-ns: default interrupt moderation interval is 5000ns
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Example:
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usb@f0931000 {
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--- a/drivers/usb/host/xhci-mtk.c
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+++ b/drivers/usb/host/xhci-mtk.c
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@@ -629,6 +629,15 @@ static int xhci_mtk_probe(struct platfor
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xhci = hcd_to_xhci(hcd);
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xhci->main_hcd = hcd;
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+
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+ /*
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+ * imod_interval is the interrupt moderation value in nanoseconds.
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+ * The increment interval is 8 times as much as that defined in
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+ * the xHCI spec on MTK's controller.
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+ */
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+ xhci->imod_interval = 5000;
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+ device_property_read_u32(dev, "imod-interval-ns", &xhci->imod_interval);
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+
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xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
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dev_name(dev), hcd);
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if (!xhci->shared_hcd) {
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--- a/drivers/usb/host/xhci-pci.c
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+++ b/drivers/usb/host/xhci-pci.c
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@@ -279,6 +279,9 @@ static int xhci_pci_setup(struct usb_hcd
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if (!xhci->sbrn)
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pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
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+ /* imod_interval is the interrupt moderation value in nanoseconds. */
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+ xhci->imod_interval = 40000;
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+
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retval = xhci_gen_setup(hcd, xhci_pci_quirks);
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if (retval)
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return retval;
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--- a/drivers/usb/host/xhci-plat.c
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+++ b/drivers/usb/host/xhci-plat.c
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@@ -269,6 +269,11 @@ static int xhci_plat_probe(struct platfo
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if (device_property_read_bool(&pdev->dev, "quirk-broken-port-ped"))
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xhci->quirks |= XHCI_BROKEN_PORT_PED;
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+ /* imod_interval is the interrupt moderation value in nanoseconds. */
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+ xhci->imod_interval = 40000;
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+ device_property_read_u32(sysdev, "imod-interval-ns",
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+ &xhci->imod_interval);
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+
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hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
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if (IS_ERR(hcd->usb_phy)) {
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ret = PTR_ERR(hcd->usb_phy);
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--- a/drivers/usb/host/xhci.c
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+++ b/drivers/usb/host/xhci.c
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@@ -610,11 +610,7 @@ int xhci_run(struct usb_hcd *hcd)
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"// Set the interrupt modulation register");
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temp = readl(&xhci->ir_set->irq_control);
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temp &= ~ER_IRQ_INTERVAL_MASK;
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- /*
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- * the increment interval is 8 times as much as that defined
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- * in xHCI spec on MTK's controller
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- */
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- temp |= (u32) ((xhci->quirks & XHCI_MTK_HOST) ? 20 : 160);
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+ temp |= (xhci->imod_interval / 250) & ER_IRQ_INTERVAL_MASK;
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writel(temp, &xhci->ir_set->irq_control);
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/* Set the HCD state before we enable the irqs */
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--- a/drivers/usb/host/xhci.h
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+++ b/drivers/usb/host/xhci.h
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@@ -1730,6 +1730,8 @@ struct xhci_hcd {
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u8 max_interrupters;
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u8 max_ports;
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u8 isoc_threshold;
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+ /* imod_interval in ns (I * 250ns) */
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+ u32 imod_interval;
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int event_ring_max;
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/* 4KB min, 128MB max */
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int page_size;
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