[v5,2/3] usb: renesas_usbhs: enable DVSE interrupt
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Message ID 1568207756-22325-2-git-send-email-external.veeraiyan.c@de.adit-jv.com
State Accepted
Delegated to: Geert Uytterhoeven
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Series
  • [v5,1/3] usb: renesas_usbhs: simplify usbhs_status_get_device_state()
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Commit Message

veeraiyan chidambaram Sept. 11, 2019, 1:15 p.m. UTC
From: Eugeniu Rosca <erosca@de.adit-jv.com>

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>
---
v5: fixed checkpatch warning
v4: https://patchwork.kernel.org/patch/11138201/
v3: https://patchwork.kernel.org/patch/11137693/
v2: https://patchwork.kernel.org/patch/11135109/
v1: https://patchwork.kernel.org/patch/10581485/
 drivers/usb/renesas_usbhs/mod.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Comments

Yoshihiro Shimoda Sept. 20, 2019, 2:28 a.m. UTC | #1
Hi Veeraiyan-san,

> From: Veeraiyan Chidambaram, Sent: Wednesday, September 11, 2019 10:16 PM
> 
> From: Eugeniu Rosca <erosca@de.adit-jv.com>
> 
> 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>
> ---
> v5: fixed checkpatch warning
> v4: https://patchwork.kernel.org/patch/11138201/

Thank you for the patch. So,

Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Best regards,
Yoshihiro Shimoda

Patch
diff mbox series

diff --git a/drivers/usb/renesas_usbhs/mod.c b/drivers/usb/renesas_usbhs/mod.c
index 4fbb1d538b82..3384308169f5 100644
--- a/drivers/usb/renesas_usbhs/mod.c
+++ b/drivers/usb/renesas_usbhs/mod.c
@@ -339,10 +339,6 @@  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;
 
@@ -353,6 +349,9 @@  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;