diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/820-usb-0004-usb-dwc3-use-suspend-clock-from-dt-to-set-power-down.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/820-usb-0004-usb-dwc3-use-suspend-clock-from-dt-to-set-power-down.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/820-usb-0004-usb-dwc3-use-suspend-clock-from-dt-to-set-power-down.patch b/target/linux/layerscape/patches-5.4/820-usb-0004-usb-dwc3-use-suspend-clock-from-dt-to-set-power-down.patch new file mode 100644 index 0000000000..a1a06f0b9e --- /dev/null +++ b/target/linux/layerscape/patches-5.4/820-usb-0004-usb-dwc3-use-suspend-clock-from-dt-to-set-power-down.patch @@ -0,0 +1,62 @@ +From 0d4749abb6f7d042643ba1aa27a7388e8290b6f5 Mon Sep 17 00:00:00 2001 +From: Li Jun <jun.li@nxp.com> +Date: Tue, 16 Apr 2019 14:02:38 +0800 +Subject: [PATCH] usb: dwc3: use suspend clock from dt to set power down scale + +Since the new dwc3 use bulk clks including the suspend clk, so we can +use it to calculate the power down scale value. + +Acked-by: Peter Chen <peter.chen@nxp.com> +Signed-off-by: Li Jun <jun.li@nxp.com> +--- + drivers/usb/dwc3/core.c | 21 +++++++++++++++++++++ + drivers/usb/dwc3/core.h | 1 + + 2 files changed, 22 insertions(+) + +--- a/drivers/usb/dwc3/core.c ++++ b/drivers/usb/dwc3/core.c +@@ -894,6 +894,25 @@ static void dwc3_set_incr_burst_type(str + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg); + } + ++static void dwc3_set_power_down_clk_scale(struct dwc3 *dwc) ++{ ++ u32 reg, scale; ++ ++ if (dwc->num_clks == 0) ++ return; ++ ++ /* ++ * The power down scale field specifies how many suspend_clk ++ * periods fit into a 16KHz clock period. When performing ++ * the division, round up the remainder. ++ */ ++ scale = DIV_ROUND_UP(clk_get_rate(dwc->clks[2].clk), 16384); ++ reg = dwc3_readl(dwc->regs, DWC3_GCTL); ++ reg &= ~(DWC3_GCTL_PWRDNSCALE_MASK); ++ reg |= DWC3_GCTL_PWRDNSCALE(scale); ++ dwc3_writel(dwc->regs, DWC3_GCTL, reg); ++} ++ + /** + * dwc3_core_init - Low-level initialization of DWC3 Core + * @dwc: Pointer to our controller context structure +@@ -918,6 +937,8 @@ static int dwc3_core_init(struct dwc3 *d + dwc->maximum_speed = USB_SPEED_HIGH; + } + ++ dwc3_set_power_down_clk_scale(dwc); ++ + ret = dwc3_phy_setup(dwc); + if (ret) + goto err0; +--- a/drivers/usb/dwc3/core.h ++++ b/drivers/usb/dwc3/core.h +@@ -223,6 +223,7 @@ + + /* Global Configuration Register */ + #define DWC3_GCTL_PWRDNSCALE(n) ((n) << 19) ++#define DWC3_GCTL_PWRDNSCALE_MASK DWC3_GCTL_PWRDNSCALE(0x1fff) + #define DWC3_GCTL_U2RSTECN BIT(16) + #define DWC3_GCTL_RAMCLKSEL(x) (((x) & DWC3_GCTL_CLK_MASK) << 6) + #define DWC3_GCTL_CLK_BUS (0) |