Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode
On 5/23/2014 2:12 AM, Bin Liu wrote:
Hi George,
On Mon, May 19, 2014 at 11:32 PM, George Cherian george.cher...@ti.com wrote:
Hi Bin,
On 5/19/2014 9:24 PM, Bin Liu wrote:
Hi,
On Mon, May 19, 2014 at 8:39 AM, George Cherian george.cher...@ti.com
wrote:
BABBLE and RESET share the same interrupt. The interrupt
is considered to be RESET if MUSB is in peripheral mode and
as a BABBLE if MUSB is in HOST mode.
Handle babble condition iff MUSB is in HOST mode.
Signed-off-by: George Cherian george.cher...@ti.com
---
drivers/usb/musb/musb_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 61da471..eff3c5c 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -849,7 +849,7 @@ b_host:
}
/* handle babble condition */
- if (int_usb MUSB_INTR_BABBLE)
+ if (int_usb MUSB_INTR_BABBLE is_host_active(musb))
schedule_work(musb-recover_work);
I guess my following comments are for Daniel's patch as while which
initially added the babble work.
Should this if statement be merged into the previous 'if(int_usb
MUSB_INTR_RESET)' one, which handles the same interrupt and already
handles host and device mode respectively.
Initially I too had the babble handling as part of 'if(int_usb
MUSB_INTR_RESET)'
one. But during my tests I hit a corner case where in we hit a BABBLE
condition
on disconnect. In such case the babble interrupt can be handled only if we
have a seperate
check, else its considered as a BUS RESET.
When all devices are disconnected MUSB_DEVCTL_HM = 0 and the code always
enter the
else path. In this path it treats the BABBLE as a BUS RESET.
The code flow is a bit confusing, two if() handle the same interrupt.
The second one implied using 'handled = IRQ_HANDLED;' from the first
one.
Also does the switch() in else{} in the first if() cause any side effect?
No it doesn't.
Since this babble handing is AM335x specific, how about handle it in
dsps_interrupt() in musb_dsps.c, which already has an entry for babble
interrupt? TI 3.2 kernel does this way.
That the reason we have platform specific callbacks added from the main
interrupt handler.
Regards,
-Bin.
Regards,
-Bin.
#if 0
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Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode
Hi George,
On Mon, May 19, 2014 at 11:32 PM, George Cherian george.cher...@ti.com wrote:
Hi Bin,
On 5/19/2014 9:24 PM, Bin Liu wrote:
Hi,
On Mon, May 19, 2014 at 8:39 AM, George Cherian george.cher...@ti.com
wrote:
BABBLE and RESET share the same interrupt. The interrupt
is considered to be RESET if MUSB is in peripheral mode and
as a BABBLE if MUSB is in HOST mode.
Handle babble condition iff MUSB is in HOST mode.
Signed-off-by: George Cherian george.cher...@ti.com
---
drivers/usb/musb/musb_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 61da471..eff3c5c 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -849,7 +849,7 @@ b_host:
}
/* handle babble condition */
- if (int_usb MUSB_INTR_BABBLE)
+ if (int_usb MUSB_INTR_BABBLE is_host_active(musb))
schedule_work(musb-recover_work);
I guess my following comments are for Daniel's patch as while which
initially added the babble work.
Should this if statement be merged into the previous 'if(int_usb
MUSB_INTR_RESET)' one, which handles the same interrupt and already
handles host and device mode respectively.
Initially I too had the babble handling as part of 'if(int_usb
MUSB_INTR_RESET)'
one. But during my tests I hit a corner case where in we hit a BABBLE
condition
on disconnect. In such case the babble interrupt can be handled only if we
have a seperate
check, else its considered as a BUS RESET.
When all devices are disconnected MUSB_DEVCTL_HM = 0 and the code always
enter the
else path. In this path it treats the BABBLE as a BUS RESET.
The code flow is a bit confusing, two if() handle the same interrupt.
The second one implied using 'handled = IRQ_HANDLED;' from the first
one.
Also does the switch() in else{} in the first if() cause any side effect?
Since this babble handing is AM335x specific, how about handle it in
dsps_interrupt() in musb_dsps.c, which already has an entry for babble
interrupt? TI 3.2 kernel does this way.
Regards,
-Bin.
Regards,
-Bin.
#if 0
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[PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode
BABBLE and RESET share the same interrupt. The interrupt is considered to be RESET if MUSB is in peripheral mode and as a BABBLE if MUSB is in HOST mode. Handle babble condition iff MUSB is in HOST mode. Signed-off-by: George Cherian george.cher...@ti.com --- drivers/usb/musb/musb_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 61da471..eff3c5c 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -849,7 +849,7 @@ b_host: } /* handle babble condition */ - if (int_usb MUSB_INTR_BABBLE) + if (int_usb MUSB_INTR_BABBLE is_host_active(musb)) schedule_work(musb-recover_work); #if 0 -- 1.8.3.1 -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode
Hi, On Mon, May 19, 2014 at 8:39 AM, George Cherian george.cher...@ti.com wrote: BABBLE and RESET share the same interrupt. The interrupt is considered to be RESET if MUSB is in peripheral mode and as a BABBLE if MUSB is in HOST mode. Handle babble condition iff MUSB is in HOST mode. Signed-off-by: George Cherian george.cher...@ti.com --- drivers/usb/musb/musb_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 61da471..eff3c5c 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -849,7 +849,7 @@ b_host: } /* handle babble condition */ - if (int_usb MUSB_INTR_BABBLE) + if (int_usb MUSB_INTR_BABBLE is_host_active(musb)) schedule_work(musb-recover_work); I guess my following comments are for Daniel's patch as while which initially added the babble work. Should this if statement be merged into the previous 'if(int_usb MUSB_INTR_RESET)' one, which handles the same interrupt and already handles host and device mode respectively. Regards, -Bin. #if 0 -- 1.8.3.1 -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode
Hi Bin, On 5/19/2014 9:24 PM, Bin Liu wrote: Hi, On Mon, May 19, 2014 at 8:39 AM, George Cherian george.cher...@ti.com wrote: BABBLE and RESET share the same interrupt. The interrupt is considered to be RESET if MUSB is in peripheral mode and as a BABBLE if MUSB is in HOST mode. Handle babble condition iff MUSB is in HOST mode. Signed-off-by: George Cherian george.cher...@ti.com --- drivers/usb/musb/musb_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 61da471..eff3c5c 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -849,7 +849,7 @@ b_host: } /* handle babble condition */ - if (int_usb MUSB_INTR_BABBLE) + if (int_usb MUSB_INTR_BABBLE is_host_active(musb)) schedule_work(musb-recover_work); I guess my following comments are for Daniel's patch as while which initially added the babble work. Should this if statement be merged into the previous 'if(int_usb MUSB_INTR_RESET)' one, which handles the same interrupt and already handles host and device mode respectively. Initially I too had the babble handling as part of 'if(int_usb MUSB_INTR_RESET)' one. But during my tests I hit a corner case where in we hit a BABBLE condition on disconnect. In such case the babble interrupt can be handled only if we have a seperate check, else its considered as a BUS RESET. When all devices are disconnected MUSB_DEVCTL_HM = 0 and the code always enter the else path. In this path it treats the BABBLE as a BUS RESET. Regards, -Bin. #if 0 -- 1.8.3.1 -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- -George -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
