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Commit a31a942a authored by Daniel Mack's avatar Daniel Mack Committed by Felipe Balbi
Browse files

usb: phy: am335x-control: wait 1ms after power-up transitions 



Tests have shown that when a power-up transition is followed by other
PHY operations too quickly, the USB port appears dead. Waiting 1ms fixes
this problem.

Signed-off-by: default avatarDaniel Mack <zonque@gmail.com>
Cc: stable@vger.kernel.org [3.14]
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 2656c9e2

drivers/usb/phy/phy-am335x-control.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -3,6 +3,7 @@ 
#include <linux/err.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/of.h>

#include <linux/io.h>

#include <linux/io.h>

#include <linux/delay.h>

#include "am35x-phy-control.h"

#include "am35x-phy-control.h"





struct am335x_control_usb {

struct am335x_control_usb {
@@ -86,6 +87,14 @@ static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on) 
	}

	}





	writel(val, usb_ctrl->phy_reg + reg);

	writel(val, usb_ctrl->phy_reg + reg);



	/*

	 * Give the PHY ~1ms to complete the power up operation.

	 * Tests have shown unstable behaviour if other USB PHY related

	 * registers are written too shortly after such a transition.

	 */

	if (on)

		mdelay(1);

}

}





static const struct phy_control ctrl_am335x = {

static const struct phy_control ctrl_am335x = {