linux-usb.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	linux-usb@vger.kernel.org,
	Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: John Youn <John.Youn@synopsys.com>
Subject: [PATCH 1/2] usb: dwc3: core: Properly default unspecified speed
Date: Fri, 24 Jul 2020 14:01:02 -0700	[thread overview]
Message-ID: <4aa1f6dd1d4d895fcf3d987323c1e37672a71680.1595624103.git.thinhn@synopsys.com> (raw)
In-Reply-To: <cover.1595624103.git.thinhn@synopsys.com>

If the maximum_speed is not specified, default the device speed base on
its HW capability. Don't prematurely check HW capability before
validating the maximum_speed device property. The device property takes
precedence in dwc->maximum_speed.

Fixes: 0e1e5c47f7a9 ("usb: dwc3: add support for USB 2.0-only core configuration")
Reported-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
---
 drivers/usb/dwc3/core.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 422aea24afcd..7f6f5567b118 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -930,13 +930,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
 	 */
 	dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
 
-	/* Handle USB2.0-only core configuration */
-	if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
-			DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
-		if (dwc->maximum_speed == USB_SPEED_SUPER)
-			dwc->maximum_speed = USB_SPEED_HIGH;
-	}
-
 	ret = dwc3_phy_setup(dwc);
 	if (ret)
 		goto err0;
@@ -1382,6 +1375,8 @@ bool dwc3_has_imod(struct dwc3 *dwc)
 static void dwc3_check_params(struct dwc3 *dwc)
 {
 	struct device *dev = dwc->dev;
+	unsigned int hwparam_gen =
+		DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3);
 
 	/* Check for proper value of imod_interval */
 	if (dwc->imod_interval && !dwc3_has_imod(dwc)) {
@@ -1413,17 +1408,23 @@ static void dwc3_check_params(struct dwc3 *dwc)
 			dwc->maximum_speed);
 		/* fall through */
 	case USB_SPEED_UNKNOWN:
-		/* default to superspeed */
-		dwc->maximum_speed = USB_SPEED_SUPER;
-
-		/*
-		 * default to superspeed plus if we are capable.
-		 */
-		if ((DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) &&
-		    (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
-		     DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
+		switch (hwparam_gen) {
+		case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
 			dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
-
+			break;
+		case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
+			if (DWC3_IP_IS(DWC32))
+				dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
+			else
+				dwc->maximum_speed = USB_SPEED_SUPER;
+			break;
+		case DWC3_GHWPARAMS3_SSPHY_IFC_DIS:
+			dwc->maximum_speed = USB_SPEED_HIGH;
+			break;
+		default:
+			dwc->maximum_speed = USB_SPEED_SUPER;
+			break;
+		}
 		break;
 	}
 }
-- 
2.11.0


  reply	other threads:[~2020-07-24 21:01 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24 21:00 [PATCH 0/2] usb: dwc3: Valid HW capability Thinh Nguyen
2020-07-24 21:01 ` Thinh Nguyen [this message]
2020-07-24 21:01 ` [PATCH 2/2] usb: dwc3: core: Print warning on unsupported speed Thinh Nguyen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4aa1f6dd1d4d895fcf3d987323c1e37672a71680.1595624103.git.thinhn@synopsys.com \
    --to=thinh.nguyen@synopsys.com \
    --cc=John.Youn@synopsys.com \
    --cc=balbi@kernel.org \
    --cc=chunfeng.yun@mediatek.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-usb@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).