From: Venu Byravarasu <vbyravarasu@nvidia.com>
To: <gregkh@linuxfoundation.org>, <stern@rowland.harvard.edu>,
<swarren@wwwdotorg.org>
Cc: <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-tegra@vger.kernel.org>,
Venu Byravarasu <vbyravarasu@nvidia.com>
Subject: [PATCH resend] usb: host: tegra: Reset Tegra USB controller before init
Date: Wed, 3 Apr 2013 16:11:12 +0530 [thread overview]
Message-ID: <1364985672-3725-1-git-send-email-vbyravarasu@nvidia.com> (raw)
To clear any configurations made by U-Boot on Tegra USB controller,
reset it before init in probe.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
reviewed-by: Stephen Warren <swarren@nvidia.com>
---
This patch was already reviewed at:
http://marc.info/?l=linux-usb&m=136203353205291&w=2
drivers/usb/host/ehci-tegra.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 1d2488c..60ed5d1 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -28,6 +28,7 @@
#include <linux/pm_runtime.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
+#include <linux/clk/tegra.h>
#define TEGRA_USB_BASE 0xC5000000
#define TEGRA_USB2_BASE 0xC5004000
@@ -691,6 +692,10 @@ static int tegra_ehci_probe(struct platform_device *pdev)
if (err)
goto fail_clk;
+ tegra_periph_reset_assert(tegra->clk);
+ udelay(1);
+ tegra_periph_reset_deassert(tegra->clk);
+
tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node,
"nvidia,needs-double-reset");
--
1.7.0.4
reply other threads:[~2013-04-03 10:46 UTC|newest]
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