diff options
| author | Eugeniu Rosca <erosca@de.adit-jv.com> | 2019-09-11 15:15:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-04 14:16:54 +0200 |
| commit | fef22636889e18517c2fc0ff88e2ae401bb9a76d (patch) | |
| tree | 7a91b3d35a16f1bfb6c497cd3d1d67f50d6a1357 /drivers/usb/renesas_usbhs | |
| parent | 5022204a464c598e36470717f5dda18576234bce (diff) | |
| download | linux-fef22636889e18517c2fc0ff88e2ae401bb9a76d.tar.bz2 | |
usb: renesas_usbhs: enable DVSE interrupt
Commit [1] enabled the possibility of checking the DVST (Device State
Transition) bit of INTSTS0 (Interrupt Status Register 0) and calling
the irq_dev_state() handler if the DVST bit is set. But neither
commit [1] nor commit [2] actually enabled the DVSE (Device State
Transition Interrupt Enable) bit in the INTENB0 (Interrupt Enable
Register 0). As a consequence, irq_dev_state() handler is getting
called as a side effect of other (non-DVSE) interrupts being fired,
which definitely can't be relied upon, if DVST notifications are of
any value.
Why this doesn't hurt is because usbhsg_irq_dev_state() currently
doesn't do much except of a dev_dbg(). Once more work is added to
the handler (e.g. detecting device "Suspended" state and notifying
other USB gadget components about it), enabling DVSE becomes a hard
requirement. Do it in a standalone commit for better visibility and
clear explanation.
[1] commit f1407d5c6624 ("usb: renesas_usbhs: Add Renesas USBHS common
code")
[2] commit 2f98382dcdfe ("usb: renesas_usbhs: Add Renesas USBHS Gadget")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Veeraiyan Chidambaram <veeraiyan.chidambaram@in.bosch.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1568207756-22325-2-git-send-email-external.veeraiyan.c@de.adit-jv.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/renesas_usbhs')
| -rw-r--r-- | drivers/usb/renesas_usbhs/mod.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/usb/renesas_usbhs/mod.c b/drivers/usb/renesas_usbhs/mod.c index 1b3ae5c9baef..b98112cefaa4 100644 --- a/drivers/usb/renesas_usbhs/mod.c +++ b/drivers/usb/renesas_usbhs/mod.c @@ -338,10 +338,6 @@ void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) * usbhs_interrupt */ - /* - * it don't enable DVSE (intenb0) here - * but "mod->irq_dev_state" will be called. - */ if (info->irq_vbus) intenb0 |= VBSE; @@ -352,6 +348,9 @@ void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) if (mod->irq_ctrl_stage) intenb0 |= CTRE; + if (mod->irq_dev_state) + intenb0 |= DVSE; + if (mod->irq_empty && mod->irq_bempsts) { usbhs_write(priv, BEMPENB, mod->irq_bempsts); intenb0 |= BEMPE; |