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63 lines
1.9 KiB
Diff
63 lines
1.9 KiB
Diff
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From 0d4749abb6f7d042643ba1aa27a7388e8290b6f5 Mon Sep 17 00:00:00 2001
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From: Li Jun <jun.li@nxp.com>
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Date: Tue, 16 Apr 2019 14:02:38 +0800
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Subject: [PATCH] usb: dwc3: use suspend clock from dt to set power down scale
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Since the new dwc3 use bulk clks including the suspend clk, so we can
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use it to calculate the power down scale value.
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Acked-by: Peter Chen <peter.chen@nxp.com>
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Signed-off-by: Li Jun <jun.li@nxp.com>
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---
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drivers/usb/dwc3/core.c | 21 +++++++++++++++++++++
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drivers/usb/dwc3/core.h | 1 +
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2 files changed, 22 insertions(+)
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--- a/drivers/usb/dwc3/core.c
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+++ b/drivers/usb/dwc3/core.c
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@@ -894,6 +894,25 @@ static void dwc3_set_incr_burst_type(str
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dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg);
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}
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+static void dwc3_set_power_down_clk_scale(struct dwc3 *dwc)
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+{
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+ u32 reg, scale;
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+
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+ if (dwc->num_clks == 0)
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+ return;
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+
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+ /*
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+ * The power down scale field specifies how many suspend_clk
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+ * periods fit into a 16KHz clock period. When performing
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+ * the division, round up the remainder.
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+ */
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+ scale = DIV_ROUND_UP(clk_get_rate(dwc->clks[2].clk), 16384);
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+ reg = dwc3_readl(dwc->regs, DWC3_GCTL);
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+ reg &= ~(DWC3_GCTL_PWRDNSCALE_MASK);
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+ reg |= DWC3_GCTL_PWRDNSCALE(scale);
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+ dwc3_writel(dwc->regs, DWC3_GCTL, reg);
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+}
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+
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/**
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* dwc3_core_init - Low-level initialization of DWC3 Core
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* @dwc: Pointer to our controller context structure
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@@ -918,6 +937,8 @@ static int dwc3_core_init(struct dwc3 *d
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dwc->maximum_speed = USB_SPEED_HIGH;
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}
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+ dwc3_set_power_down_clk_scale(dwc);
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+
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ret = dwc3_phy_setup(dwc);
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if (ret)
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goto err0;
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--- a/drivers/usb/dwc3/core.h
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+++ b/drivers/usb/dwc3/core.h
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@@ -223,6 +223,7 @@
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/* Global Configuration Register */
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#define DWC3_GCTL_PWRDNSCALE(n) ((n) << 19)
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+#define DWC3_GCTL_PWRDNSCALE_MASK DWC3_GCTL_PWRDNSCALE(0x1fff)
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#define DWC3_GCTL_U2RSTECN BIT(16)
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#define DWC3_GCTL_RAMCLKSEL(x) (((x) & DWC3_GCTL_CLK_MASK) << 6)
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#define DWC3_GCTL_CLK_BUS (0)
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