linux-kernel - Re: [PATCH 1/2] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

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Message-ID: <fa6d1e00-5cd4-3285-a311-6e348554edee@ti.com>
Date:   Tue, 18 Apr 2017 11:30:50 +0300
From:   Roger Quadros <rogerq@...com>
To:     Tony Lindgren <tony@...mide.com>, Lee Jones <lee.jones@...aro.org>,
        Samuel Ortiz <sameo@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 1/2] mfd: omap-usb-tll: Fix inverted bit use for USB TLL
 mode

On 15/04/17 20:05, Tony Lindgren wrote:
> Commit 16fa3dc75c22 ("mfd: omap-usb-tll: HOST TLL platform driver")
> added support for USB TLL, but uses OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
> bit the wrong way. The comments in the code are correct, but the inverted
> use of OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF causes the register to be
> enabled instead of disabled unlike what the comments say.
> 
> Without this change the Wrigley 3G LTE modem on droid 4 EHCI bus can
> be only pinged few times before it stops responding.
> 
> Fixes: 16fa3dc75c22 ("mfd: omap-usb-tll: HOST TLL platform driver")
> Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
> Cc: Keshava Munegowda <keshava_mgowda@...com>
> Cc: Marcel Partap <mpartap@....net>
> Cc: Michael Scott <michael.scott@...aro.org>
> Cc: Roger Quadros <rogerq@...com>
> Cc: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Acked-by: Roger Quadros <rogerq@...com>

> ---
>  drivers/mfd/omap-usb-tll.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
> --- a/drivers/mfd/omap-usb-tll.c
> +++ b/drivers/mfd/omap-usb-tll.c
> @@ -377,8 +377,8 @@ int omap_tll_init(struct usbhs_omap_platform_data *pdata)
>  				 * and use SDR Mode
>  				 */
>  				reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
> -					| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
>  					| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
> +				reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
>  			} else if (pdata->port_mode[i] ==
>  					OMAP_EHCI_PORT_MODE_HSIC) {
>  				/*
> 

cheers,
-roger