From 92a8dd26464e1f21f1d869ec53717bd2c1200d63 Mon Sep 17 00:00:00 2001
From: Minas Harutyunyan <hminas@synopsys.com>
Date: Fri, 19 Jan 2018 14:44:20 +0400
Subject: [PATCH] usb: dwc2: host: Fix transaction errors in host mode
Git-commit: 92a8dd26464e1f21f1d869ec53717bd2c1200d63
Patch-mainline: v4.17-rc1
References: bsc#1051510
Added missing GUSBCFG programming in host mode, which fixes
transaction errors issue on HiKey and Altera Cyclone V boards.
These field even if was programmed in device mode (in function
dwc2_hsotg_core_init_disconnected()) will be resetting to POR values
after core soft reset applied.
So, each time when switching to host mode required to set this field
to correct value.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/usb/dwc2/hcd.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 2cb4f4f3981f..6f7f9c73b596 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -2328,10 +2328,22 @@ static int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
*/
static void dwc2_core_host_init(struct dwc2_hsotg *hsotg)
{
- u32 hcfg, hfir, otgctl;
+ u32 hcfg, hfir, otgctl, usbcfg;
dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
+ /* Set HS/FS Timeout Calibration to 7 (max available value).
+ * The number of PHY clocks that the application programs in
+ * this field is added to the high/full speed interpacket timeout
+ * duration in the core to account for any additional delays
+ * introduced by the PHY. This can be required, because the delay
+ * introduced by the PHY in generating the linestate condition
+ * can vary from one PHY to another.
+ */
+ usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
+ usbcfg |= GUSBCFG_TOUTCAL(7);
+ dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
+
/* Restart the Phy Clock */
dwc2_writel(0, hsotg->regs + PCGCTL);
--
2.18.0