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UPSTREAM: usb: dwc2: Restore GUSBCFG in dwc2_get_hwparams()

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Previously dwc2_get_hwparams() was changing GUSBCFG and not putting it
back the way it was (specifically it set and cleared FORCEHOSTMODE).
Since we want to move dwc2_core_reset() _before_ dwc2_get_hwparams() we
should make sure dwc2_get_hwparams() isn't messing with things in a
permanent way.

Since we're now looking at GUSBCFG, it's obvious that we shouldn't need
all the extra delays if FORCEHOSTMODE was already set.  This will avoid
some delays for any ports that have forced host mode.

Change-Id: I514aaaf77a7ee3f0871efb15e659b93b9717c5f1
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
(cherry picked from commit 991824677f)
This commit is contained in:
Jacob Chen
2016-08-16 09:15:55 +08:00
committed by Huang, Tao
parent 6fd9def28b
commit 186b8dd21c
1 changed files with 9 additions and 7 deletions
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16
drivers/usb/dwc2/core.c
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@@ -3096,18 +3096,20 @@ int dwc2_get_hwparams(struct dwc2_hsotg *hsotg)
/* Force host mode to get HPTXFSIZ / GNPTXFSIZ exact power on value */
gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
gusbcfg |= GUSBCFG_FORCEHOSTMODE;
dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
usleep_range(100000, 150000);
if (!(gusbcfg & GUSBCFG_FORCEHOSTMODE)) {
dwc2_writel(gusbcfg | GUSBCFG_FORCEHOSTMODE,
hsotg->regs + GUSBCFG);
usleep_range(100000, 150000);
}
gnptxfsiz = dwc2_readl(hsotg->regs + GNPTXFSIZ);
hptxfsiz = dwc2_readl(hsotg->regs + HPTXFSIZ);
dev_dbg(hsotg->dev, "gnptxfsiz=%08x\n", gnptxfsiz);
dev_dbg(hsotg->dev, "hptxfsiz=%08x\n", hptxfsiz);
gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
usleep_range(100000, 150000);
if (!(gusbcfg & GUSBCFG_FORCEHOSTMODE)) {
dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
usleep_range(100000, 150000);
}
/* hwcfg2 */
hw->op_mode = (hwcfg2 & GHWCFG2_OP_MODE_MASK) >>