Hi,
On Wed, Sep 14, 2016 at 11:10:19AM -0700, Tony Lindgren wrote:
> Commit a83e17d0f73b ("usb: musb: Improve PM runtime and phy handling
> for 2430 glue layer") moved PHY enable/disable calls to happen from
> omap2430_musb_enable/disable(). That broke enumeration for several
> devices as PM runtime in the PHY will never enable it.
>
> The root cause of the problem is unpaired calls from musb_core.c to
> musb_platform_enable/disable in musb_core.c as reported by
> Andreas Kemnade <[email protected]>.
>
> As musb_platform_enable/disable are being called from various functions,
> let's not attempt to make them paiered immediately. This would require
> fixing all the callers like musb_remove.
>
> Instead, let's first fix the regression in a minimal way by removing
> the initial call to musb_platform_disable. To do that in a safe way,
> we need to call the glue specific *_musb_disable() directly in the
> glue layer *_musb_init() as noted by Bin Liu <[email protected]>.
>
> AFAIK the initial musb_platform_disable call has always been just an
> attempted workaround for the 2430 glue layer announcing itself too
> early before the gadgets are configured. And that issue finally
> got fixed with commit a118df07f5b1 ("usb: musb: Don't set d+ high
> before enable for 2430 glue layer").
>
> Further, most of the glue layers already do a reset of the musb
> controller in the *_musb_init(), so later on we may want to
> consider removing the calls to *__musb_disable() where a reset is
> already done.
>
> Note that we now also need to fix the twl4030-phy accordingly making
> it's PM runtime call only needed in twl4030_phy_power_on and have it
> autosuspend. The cable state will keep the phy active when connected.
>
> Cc: Hans de Goede <[email protected]>
> Cc: Kishon Vijay Abraham I <[email protected]>
> Fixes: a83e17d0f73b ("usb: musb: Improve PM runtime and phy handling
> for 2430 glue layer")
> Reported-by: Andreas Kemnade <[email protected]>
> Acked-by: Andreas Kemnade <[email protected]>
> Reported-by: Laurent Pinchart <[email protected]>
> Tested-by: Laurent Pinchart <[email protected]>
> Acked-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Tony Lindgren <[email protected]>
> ---
If Kishon wants to take it, here is my
Acked-by: Bin Liu <[email protected]>
Regards
-Bin.
>
> I've kept the 2430 glue layer related acks as those parts did
> not change. For the glue layers doing things in *_musb_disable(),
> I've tested da8xx, am35x and musb_dsps glue layers.
>
> Changes since v2:
>
> - Added glue layer calls to *_musb_disable() from *_musb_init()
> where needed as suggested by Bin
>
> ---
> drivers/phy/phy-twl4030-usb.c | 4 ++--
> drivers/usb/musb/am35x.c | 1 +
> drivers/usb/musb/da8xx.c | 1 +
> drivers/usb/musb/davinci.c | 1 +
> drivers/usb/musb/musb_core.c | 1 -
> drivers/usb/musb/musb_dsps.c | 1 +
> drivers/usb/musb/sunxi.c | 3 +++
> drivers/usb/musb/tusb6010.c | 1 +
> 8 files changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/phy/phy-twl4030-usb.c b/drivers/phy/phy-twl4030-usb.c
> --- a/drivers/phy/phy-twl4030-usb.c
> +++ b/drivers/phy/phy-twl4030-usb.c
> @@ -447,8 +447,6 @@ static int twl4030_phy_power_off(struct phy *phy)
> struct twl4030_usb *twl = phy_get_drvdata(phy);
>
> dev_dbg(twl->dev, "%s\n", __func__);
> - pm_runtime_mark_last_busy(twl->dev);
> - pm_runtime_put_autosuspend(twl->dev);
>
> return 0;
> }
> @@ -465,6 +463,8 @@ static int twl4030_phy_power_on(struct phy *phy)
> twl4030_i2c_access(twl, 0);
> twl->linkstat = MUSB_UNKNOWN;
> schedule_delayed_work(&twl->id_workaround_work, HZ);
> + pm_runtime_mark_last_busy(twl->dev);
> + pm_runtime_put_autosuspend(twl->dev);
>
> return 0;
> }
> diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c
> --- a/drivers/usb/musb/am35x.c
> +++ b/drivers/usb/musb/am35x.c
> @@ -381,6 +381,7 @@ static int am35x_musb_init(struct musb *musb)
>
> msleep(5);
>
> + am35x_musb_disable(musb);
> musb->isr = am35x_musb_interrupt;
>
> /* clear level interrupt */
> diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
> --- a/drivers/usb/musb/da8xx.c
> +++ b/drivers/usb/musb/da8xx.c
> @@ -440,6 +440,7 @@ static int da8xx_musb_init(struct musb *musb)
> rev, __raw_readl(CFGCHIP2),
> musb_readb(reg_base, DA8XX_USB_CTRL_REG));
>
> + da8xx_musb_disable(musb);
> musb->isr = da8xx_musb_interrupt;
> return 0;
> fail:
> diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
> --- a/drivers/usb/musb/davinci.c
> +++ b/drivers/usb/musb/davinci.c
> @@ -432,6 +432,7 @@ static int davinci_musb_init(struct musb *musb)
> revision, __raw_readl(USB_PHY_CTRL),
> musb_readb(tibase, DAVINCI_USB_CTRL_REG));
>
> + davinci_musb_disable(musb);
> musb->isr = davinci_musb_interrupt;
> return 0;
>
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 74fc306..f7dc3df 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -2142,7 +2142,6 @@ musb_init_controller(struct device *dev, int nIrq, void
> __iomem *ctrl)
> }
>
> /* be sure interrupts are disabled before connecting ISR */
> - musb_platform_disable(musb);
> musb_generic_disable(musb);
>
> /* Init IRQ workqueue before request_irq */
> diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> --- a/drivers/usb/musb/musb_dsps.c
> +++ b/drivers/usb/musb/musb_dsps.c
> @@ -441,6 +441,7 @@ static int dsps_musb_init(struct musb *musb)
> /* Reset the musb */
> musb_writel(reg_base, wrp->control, (1 << wrp->reset));
>
> + dsps_musb_disable(musb);
> musb->isr = dsps_interrupt;
>
> /* reset the otgdisable bit, needed for host mode to work */
> diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
> --- a/drivers/usb/musb/sunxi.c
> +++ b/drivers/usb/musb/sunxi.c
> @@ -93,6 +93,8 @@ struct sunxi_glue {
> struct notifier_block host_nb;
> };
>
> +static void sunxi_musb_disable(struct musb *musb);
> +
> /* phy_power_on / off may sleep, so we use a workqueue */
> static void sunxi_musb_work(struct work_struct *work)
> {
> @@ -265,6 +267,7 @@ static int sunxi_musb_init(struct musb *musb)
> if (ret)
> goto error_unregister_notifier;
>
> + sunxi_musb_disable(musb);
> musb->isr = sunxi_musb_interrupt;
>
> /* Stop the musb-core from doing runtime pm (not supported on sunxi) */
> diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
> --- a/drivers/usb/musb/tusb6010.c
> +++ b/drivers/usb/musb/tusb6010.c
> @@ -1149,6 +1149,7 @@ static int tusb_musb_init(struct musb *musb)
> ret);
> goto done;
> }
> + tusb_musb_disable(musb);
> musb->isr = tusb_musb_interrupt;
>
> musb->xceiv->set_power = tusb_draw_power;
> --
> 2.9.3
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