From da8fc1511fc83f6ba2cf0e1e1feadbe1b9b58f4d Mon Sep 17 00:00:00 2001
From: John Crispin <john@phrozen.org>
Date: Mon, 7 May 2018 12:07:32 +0200
Subject: mediatek: backport upstream mediatek patches
Signed-off-by: John Crispin <john@phrozen.org>
(cherry picked from commit 050da2107a7eb2a571a8a3d0cee21cc6a44b72b8)
---
...ci-allow-imod-interval-to-be-configurable.patch | 155 +++++++++++++++++++++
1 file changed, 155 insertions(+)
create mode 100644 target/linux/mediatek/patches-4.14/0191-usb-xhci-allow-imod-interval-to-be-configurable.patch
(limited to 'target/linux/mediatek/patches-4.14/0191-usb-xhci-allow-imod-interval-to-be-configurable.patch')
diff --git a/target/linux/mediatek/patches-4.14/0191-usb-xhci-allow-imod-interval-to-be-configurable.patch b/target/linux/mediatek/patches-4.14/0191-usb-xhci-allow-imod-interval-to-be-configurable.patch
new file mode 100644
index 0000000000..8bb6d5c51e
--- /dev/null
+++ b/target/linux/mediatek/patches-4.14/0191-usb-xhci-allow-imod-interval-to-be-configurable.patch
@@ -0,0 +1,155 @@
+From c5c72d252dc8e417388386d5767ea790ee8f5b44 Mon Sep 17 00:00:00 2001
+From: Adam Wallis <awallis@codeaurora.org>
+Date: Fri, 8 Dec 2017 17:59:13 +0200
+Subject: [PATCH 191/224] usb: xhci: allow imod-interval to be configurable
+
+The xHCI driver currently has the IMOD set to 160, which
+translates to an IMOD interval of 40,000ns (160 * 250)ns
+
+Commit 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
+introduced a QUIRK for the MTK platform to adjust this interval to 20,
+which translates to an IMOD interval of 5,000ns (20 * 250)ns. This is
+due to the fact that the MTK controller IMOD interval is 8 times
+as much as defined in xHCI spec.
+
+Instead of adding more quirk bits for additional platforms, this patch
+introduces the ability for vendors to set the IMOD_INTERVAL as is
+optimal for their platform. By using device_property_read_u32() on
+"imod-interval-ns", the IMOD INTERVAL can be specified in nano seconds.
+If no interval is specified, the default of 40,000ns (IMOD=160) will be
+used.
+
+No bounds checking has been implemented due to the fact that a vendor
+may have violated the spec and would need to specify a value outside of
+the max 8,000 IRQs/second limit specified in the xHCI spec.
+
+Tested-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Reviewed-by: Rob Herring <robh@kernel.org>
+Signed-off-by: Adam Wallis <awallis@codeaurora.org>
+Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt | 2 ++
+ Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 +
+ drivers/usb/host/xhci-mtk.c | 9 +++++++++
+ drivers/usb/host/xhci-pci.c | 3 +++
+ drivers/usb/host/xhci-plat.c | 5 +++++
+ drivers/usb/host/xhci.c | 6 +-----
+ drivers/usb/host/xhci.h | 2 ++
+ 7 files changed, 23 insertions(+), 5 deletions(-)
+
+diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
+index 30595964876a..9ff560298498 100644
+--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
++++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
+@@ -46,6 +46,7 @@ Optional properties:
+ - pinctrl-names : a pinctrl state named "default" must be defined
+ - pinctrl-0 : pin control group
+ See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
++ - imod-interval-ns: default interrupt moderation interval is 5000ns
+
+ Example:
+ usb30: usb@11270000 {
+@@ -66,6 +67,7 @@ usb30: usb@11270000 {
+ usb3-lpm-capable;
+ mediatek,syscon-wakeup = <&pericfg>;
+ mediatek,wakeup-src = <1>;
++ imod-interval-ns = <10000>;
+ };
+
+ 2nd: dual-role mode with xHCI driver
+diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
+index 2d80b60eeabe..2390ae58636b 100644
+--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
++++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
+@@ -28,6 +28,7 @@ Optional properties:
+ - clocks: reference to a clock
+ - usb3-lpm-capable: determines if platform is USB3 LPM capable
+ - quirk-broken-port-ped: set if the controller has broken port disable mechanism
++ - imod-interval-ns: default interrupt moderation interval is 5000ns
+
+ Example:
+ usb@f0931000 {
+diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
+index 8e51b3fec386..8e4495be6592 100644
+--- a/drivers/usb/host/xhci-mtk.c
++++ b/drivers/usb/host/xhci-mtk.c
+@@ -629,6 +629,15 @@ static int xhci_mtk_probe(struct platform_device *pdev)
+
+ xhci = hcd_to_xhci(hcd);
+ xhci->main_hcd = hcd;
++
++ /*
++ * imod_interval is the interrupt moderation value in nanoseconds.
++ * The increment interval is 8 times as much as that defined in
++ * the xHCI spec on MTK's controller.
++ */
++ xhci->imod_interval = 5000;
++ device_property_read_u32(dev, "imod-interval-ns", &xhci->imod_interval);
++
+ xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
+ dev_name(dev), hcd);
+ if (!xhci->shared_hcd) {
+diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
+index 8071c8fdd15e..cdd7d7bdfc0f 100644
+--- a/drivers/usb/host/xhci-pci.c
++++ b/drivers/usb/host/xhci-pci.c
+@@ -258,6 +258,9 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
+ if (!xhci->sbrn)
+ pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
+
++ /* imod_interval is the interrupt moderation value in nanoseconds. */
++ xhci->imod_interval = 40000;
++
+ retval = xhci_gen_setup(hcd, xhci_pci_quirks);
+ if (retval)
+ return retval;
+diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
+index 163bafde709f..47230453a876 100644
+--- a/drivers/usb/host/xhci-plat.c
++++ b/drivers/usb/host/xhci-plat.c
+@@ -265,6 +265,11 @@ static int xhci_plat_probe(struct platform_device *pdev)
+ if (device_property_read_bool(&pdev->dev, "quirk-broken-port-ped"))
+ xhci->quirks |= XHCI_BROKEN_PORT_PED;
+
++ /* imod_interval is the interrupt moderation value in nanoseconds. */
++ xhci->imod_interval = 40000;
++ device_property_read_u32(sysdev, "imod-interval-ns",
++ &xhci->imod_interval);
++
+ hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
+ if (IS_ERR(hcd->usb_phy)) {
+ ret = PTR_ERR(hcd->usb_phy);
+diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
+index b2ff1ff1a02f..ac1b26a81e77 100644
+--- a/drivers/usb/host/xhci.c
++++ b/drivers/usb/host/xhci.c
+@@ -597,11 +597,7 @@ int xhci_run(struct usb_hcd *hcd)
+ "// Set the interrupt modulation register");
+ temp = readl(&xhci->ir_set->irq_control);
+ temp &= ~ER_IRQ_INTERVAL_MASK;
+- /*
+- * the increment interval is 8 times as much as that defined
+- * in xHCI spec on MTK's controller
+- */
+- temp |= (u32) ((xhci->quirks & XHCI_MTK_HOST) ? 20 : 160);
++ temp |= (xhci->imod_interval / 250) & ER_IRQ_INTERVAL_MASK;
+ writel(temp, &xhci->ir_set->irq_control);
+
+ /* Set the HCD state before we enable the irqs */
+diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
+index 2abaa4d6d39d..614380af0f96 100644
+--- a/drivers/usb/host/xhci.h
++++ b/drivers/usb/host/xhci.h
+@@ -1723,6 +1723,8 @@ struct xhci_hcd {
+ u8 max_interrupters;
+ u8 max_ports;
+ u8 isoc_threshold;
++ /* imod_interval in ns (I * 250ns) */
++ u32 imod_interval;
+ int event_ring_max;
+ /* 4KB min, 128MB max */
+ int page_size;
+--
+2.11.0
+
--
cgit v1.2.3