@@ -464,6 +464,9 @@ static int xhci_mtk_probe(struct platform_device *pdev)
of_property_read_u32(node, "mediatek,u3p-dis-msk",
&mtk->u3p_dis_msk);
+ /* keep clock on when suspending on some platform */
+ mtk->keep_clk_on = of_property_read_bool(node, "mediatek,keep-clock-on");
+
ret = usb_wakeup_of_property_parse(mtk, node);
if (ret) {
dev_err(dev, "failed to parse uwk property\n");
@@ -624,7 +627,8 @@ static int __maybe_unused xhci_mtk_suspend(struct device *dev)
del_timer_sync(&xhci->shared_hcd->rh_timer);
xhci_mtk_host_disable(mtk);
- xhci_mtk_clks_disable(mtk);
+ if (!mtk->keep_clk_on)
+ xhci_mtk_clks_disable(mtk);
usb_wakeup_set(mtk, true);
return 0;
}
@@ -636,7 +640,8 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev)
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
usb_wakeup_set(mtk, false);
- xhci_mtk_clks_enable(mtk);
+ if (!mtk->keep_clk_on)
+ xhci_mtk_clks_enable(mtk);
xhci_mtk_host_enable(mtk);
xhci_dbg(xhci, "%s: restart port polling\n", __func__);
@@ -152,6 +152,7 @@ struct xhci_hcd_mtk {
struct regmap *uwk;
u32 uwk_reg_base;
u32 uwk_vers;
+ bool keep_clk_on;
};
static inline struct xhci_hcd_mtk *hcd_to_mtk(struct usb_hcd *hcd)
Some platform dose not support turn off clock when system suspending. We add an option "mediatek,keep-clock-on" for distinquish these platforms. When "mediatek,keep-clock-on" has been set, xhci-mtk driver will skip turning clock on and off during system suspend and resume. Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- drivers/usb/host/xhci-mtk.c | 9 +++++++-- drivers/usb/host/xhci-mtk.h | 1 + 2 files changed, 8 insertions(+), 2 deletions(-)