linux-kernel - [PATCH] usb: mtk-xhci: Set the XHCI_NO_64BIT

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Date:   Thu, 10 Oct 2019 16:50:04 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     linux-usb@...r.kernel.org
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support), linux-kernel@...r.kernel.org (open list),
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Changqi Hu <Changqi.Hu@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Shik Chen <shik@...omium.org>, Tomasz Figa <tfiga@...omium.org>
Subject: [PATCH] usb: mtk-xhci: Set the XHCI_NO_64BIT_SUPPORT quirk

MediaTek XHCI host controller does not support 64-bit addressing despite
the AC64 bit of HCCPARAMS1 register being set. The platform-specific
glue sets the DMA mask to 32 bits on its own, but it has no effect,
because xhci_gen_setup() overrides it according to hardware
capabilities.

Use the XHCI_NO_64BIT_SUPPORT quirk to tell the XHCI core to force
32-bit DMA mask instead.

Signed-off-by: Tomasz Figa <tfiga@...omium.org>
---
 drivers/usb/host/xhci-mtk.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index b18a6baef204a..4d101d52cc11b 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -395,6 +395,11 @@ static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
 	xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
 	if (mtk->lpm_support)
 		xhci->quirks |= XHCI_LPM_SUPPORT;
+	/*
+	 * MTK host controller does not support 64-bit addressing, despite
+	 * having the AC64 bit of the HCCPARAMS1 register set.
+	 */
+	xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
 }
 
 /* called during probe() after chip reset completes */
@@ -488,11 +493,6 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		goto disable_clk;
 	}
 
-	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
-	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
-	if (ret)
-		goto disable_clk;
-
 	hcd = usb_create_hcd(driver, dev, dev_name(dev));
 	if (!hcd) {
 		ret = -ENOMEM;
-- 
2.23.0.581.g78d2f28ef7-goog