From: Chunfeng Yun <chunfeng.yun@mediatek.com>
Date: Mon, 23 May 2022 09:04:48 +0000 (+0800)
Subject: usb: xhci-mtk: add support optional controller reset
X-Git-Tag: v6.1-rc5~724^2~166
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=32b615ed4b7da586eb447212e3d2665b8aa6fdb2;p=platform%2Fkernel%2Flinux-starfive.git

usb: xhci-mtk: add support optional controller reset

Add support controller reset via a reset-controller usually in infracfg,
it's different with the software reset by IPPC which only used to reset MAC,
and it will also reset IPPC meanwhile.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220523090449.14430-3-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index b1045f5..01705e5 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -18,6 +18,7 @@
 #include <linux/pm_wakeirq.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/reset.h>
 
 #include "xhci.h"
 #include "xhci-mtk.h"
@@ -550,6 +551,12 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	if (ret)
 		goto disable_ldos;
 
+	ret = device_reset_optional(dev);
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to reset controller\n");
+		goto disable_clk;
+	}
+
 	hcd = usb_create_hcd(driver, dev, dev_name(dev));
 	if (!hcd) {
 		ret = -ENOMEM;