* [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag
2020-10-09 11:03 [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Christian Eggers
@ 2020-10-09 11:03 ` Christian Eggers
2020-10-10 11:09 ` Wolfram Sang
2020-10-09 11:03 ` [PATCH v6 2/3] i2c: imx: Check for I2SR_IAL after every byte Christian Eggers
` (2 subsequent siblings)
3 siblings, 1 reply; 11+ messages in thread
From: Christian Eggers @ 2020-10-09 11:03 UTC (permalink / raw)
To: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight
Cc: Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Christian Eggers,
Krzysztof Kozlowski, stable
According to the "VFxxx Controller Reference Manual" (and the comment
block starting at line 97), Vybrid requires writing a one for clearing
an interrupt flag. Syncing the method for clearing I2SR_IIF in
i2c_imx_isr().
Signed-off-by: Christian Eggers <ceggers@arri.de>
Fixes: 4b775022f6fd ("i2c: imx: add struct to hold more configurable quirks")
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: stable@vger.kernel.org
---
drivers/i2c/busses/i2c-imx.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 0ab5381aa012..028f8a626410 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -412,6 +412,19 @@ static void i2c_imx_dma_free(struct imx_i2c_struct *i2c_imx)
dma->chan_using = NULL;
}
+static void i2c_imx_clear_irq(struct imx_i2c_struct *i2c_imx, unsigned int bits)
+{
+ unsigned int temp;
+
+ /*
+ * i2sr_clr_opcode is the value to clear all interrupts. Here we want to
+ * clear only <bits>, so we write ~i2sr_clr_opcode with just <bits>
+ * toggled. This is required because i.MX needs W0C and Vybrid uses W1C.
+ */
+ temp = ~i2c_imx->hwdata->i2sr_clr_opcode ^ bits;
+ imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR);
+}
+
static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool atomic)
{
unsigned long orig_jiffies = jiffies;
@@ -424,8 +437,7 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool a
/* check for arbitration lost */
if (temp & I2SR_IAL) {
- temp &= ~I2SR_IAL;
- imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR);
+ i2c_imx_clear_irq(i2c_imx, I2SR_IAL);
return -EAGAIN;
}
@@ -469,7 +481,7 @@ static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx, bool atomic)
*/
readb_poll_timeout_atomic(addr, regval, regval & I2SR_IIF, 5, 1000 + 100);
i2c_imx->i2csr = regval;
- imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR);
+ i2c_imx_clear_irq(i2c_imx, I2SR_IIF | I2SR_IAL);
} else {
wait_event_timeout(i2c_imx->queue, i2c_imx->i2csr & I2SR_IIF, HZ / 10);
}
@@ -623,9 +635,7 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
if (temp & I2SR_IIF) {
/* save status register */
i2c_imx->i2csr = temp;
- temp &= ~I2SR_IIF;
- temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF);
- imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR);
+ i2c_imx_clear_irq(i2c_imx, I2SR_IIF);
wake_up(&i2c_imx->queue);
return IRQ_HANDLED;
}
--
Christian Eggers
Embedded software developer
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag
2020-10-09 11:03 ` [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag Christian Eggers
@ 2020-10-10 11:09 ` Wolfram Sang
2020-12-01 7:34 ` Christian Eggers
0 siblings, 1 reply; 11+ messages in thread
From: Wolfram Sang @ 2020-10-10 11:09 UTC (permalink / raw)
To: Christian Eggers
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski, stable
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On Fri, Oct 09, 2020 at 01:03:18PM +0200, Christian Eggers wrote:
> According to the "VFxxx Controller Reference Manual" (and the comment
> block starting at line 97), Vybrid requires writing a one for clearing
> an interrupt flag. Syncing the method for clearing I2SR_IIF in
> i2c_imx_isr().
>
> Signed-off-by: Christian Eggers <ceggers@arri.de>
> Fixes: 4b775022f6fd ("i2c: imx: add struct to hold more configurable quirks")
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Cc: stable@vger.kernel.org
Applied to for-next, thanks!
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag
2020-10-10 11:09 ` Wolfram Sang
@ 2020-12-01 7:34 ` Christian Eggers
2020-12-02 15:04 ` Wolfram Sang
0 siblings, 1 reply; 11+ messages in thread
From: Christian Eggers @ 2020-12-01 7:34 UTC (permalink / raw)
To: Wolfram Sang, wsa
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski, stable
On Saturday, 10 October 2020, 13:09:20 CET, Wolfram Sang wrote:
> On Fri, Oct 09, 2020 at 01:03:18PM +0200, Christian Eggers wrote:
> > According to the "VFxxx Controller Reference Manual" (and the comment
> > block starting at line 97), Vybrid requires writing a one for clearing
> > an interrupt flag. Syncing the method for clearing I2SR_IIF in
> > i2c_imx_isr().
> >
> > Signed-off-by: Christian Eggers <ceggers@arri.de>
> > Fixes: 4b775022f6fd ("i2c: imx: add struct to hold more configurable quirks")
> > Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> > Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
> > Cc: stable@vger.kernel.org
>
> Applied to for-next, thanks!
>
I cannot find my patches in kernel/git/wsa/linux.git, branch "for-next".
Did they get lost?
regards
Christian
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag
2020-12-01 7:34 ` Christian Eggers
@ 2020-12-02 15:04 ` Wolfram Sang
0 siblings, 0 replies; 11+ messages in thread
From: Wolfram Sang @ 2020-12-02 15:04 UTC (permalink / raw)
To: Christian Eggers
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski, stable
[-- Attachment #1: Type: text/plain, Size: 414 bytes --]
> > Applied to for-next, thanks!
> >
> I cannot find my patches in kernel/git/wsa/linux.git, branch "for-next".
> Did they get lost?
It seems like it :( I seem to have forgotten to push out and then
continued to to work on another computer with an older state. It is
highly embarassing but I can't find out what exactly happened. I hope I
didn't lose more patches. I am really sorry!
Pushed to for-next again.
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^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v6 2/3] i2c: imx: Check for I2SR_IAL after every byte
2020-10-09 11:03 [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Christian Eggers
2020-10-09 11:03 ` [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag Christian Eggers
@ 2020-10-09 11:03 ` Christian Eggers
2020-10-10 11:09 ` Wolfram Sang
2020-10-09 11:03 ` [PATCH v6 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost Christian Eggers
2020-10-10 11:06 ` [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Wolfram Sang
3 siblings, 1 reply; 11+ messages in thread
From: Christian Eggers @ 2020-10-09 11:03 UTC (permalink / raw)
To: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight
Cc: Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Christian Eggers,
Krzysztof Kozlowski, stable
Arbitration Lost (IAL) can happen after every single byte transfer. If
arbitration is lost, the I2C hardware will autonomously switch from
master mode to slave. If a transfer is not aborted in this state,
consecutive transfers will not be executed by the hardware and will
timeout.
Signed-off-by: Christian Eggers <ceggers@arri.de>
Tested (not extensively) on Vybrid VF500 (Toradex VF50):
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: stable@vger.kernel.org
---
drivers/i2c/busses/i2c-imx.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 028f8a626410..69ce5eea9b5a 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -490,6 +490,16 @@ static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx, bool atomic)
dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
return -ETIMEDOUT;
}
+
+ /* check for arbitration lost */
+ if (i2c_imx->i2csr & I2SR_IAL) {
+ dev_dbg(&i2c_imx->adapter.dev, "<%s> Arbitration lost\n", __func__);
+ i2c_imx_clear_irq(i2c_imx, I2SR_IAL);
+
+ i2c_imx->i2csr = 0;
+ return -EAGAIN;
+ }
+
dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
i2c_imx->i2csr = 0;
return 0;
--
Christian Eggers
Embedded software developer
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [PATCH v6 2/3] i2c: imx: Check for I2SR_IAL after every byte
2020-10-09 11:03 ` [PATCH v6 2/3] i2c: imx: Check for I2SR_IAL after every byte Christian Eggers
@ 2020-10-10 11:09 ` Wolfram Sang
0 siblings, 0 replies; 11+ messages in thread
From: Wolfram Sang @ 2020-10-10 11:09 UTC (permalink / raw)
To: Christian Eggers
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski, stable
[-- Attachment #1: Type: text/plain, Size: 651 bytes --]
On Fri, Oct 09, 2020 at 01:03:19PM +0200, Christian Eggers wrote:
> Arbitration Lost (IAL) can happen after every single byte transfer. If
> arbitration is lost, the I2C hardware will autonomously switch from
> master mode to slave. If a transfer is not aborted in this state,
> consecutive transfers will not be executed by the hardware and will
> timeout.
>
> Signed-off-by: Christian Eggers <ceggers@arri.de>
> Tested (not extensively) on Vybrid VF500 (Toradex VF50):
> Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Cc: stable@vger.kernel.org
Applied to for-next, thanks!
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^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v6 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost
2020-10-09 11:03 [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Christian Eggers
2020-10-09 11:03 ` [PATCH v6 1/3] i2c: imx: Fix reset of I2SR_IAL flag Christian Eggers
2020-10-09 11:03 ` [PATCH v6 2/3] i2c: imx: Check for I2SR_IAL after every byte Christian Eggers
@ 2020-10-09 11:03 ` Christian Eggers
2020-10-10 11:09 ` Wolfram Sang
2020-10-10 11:06 ` [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Wolfram Sang
3 siblings, 1 reply; 11+ messages in thread
From: Christian Eggers @ 2020-10-09 11:03 UTC (permalink / raw)
To: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight
Cc: Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Christian Eggers,
Krzysztof Kozlowski, stable
If arbitration is lost, the master automatically changes to slave mode.
I2SR_IBB may or may not be reset by hardware. Raising a STOP condition
by resetting I2CR_MSTA has no effect and will not clear I2SR_IBB.
So calling i2c_imx_bus_busy() is not required and would busy-wait until
timeout.
Signed-off-by: Christian Eggers <ceggers@arri.de>
Tested (not extensively) on Vybrid VF500 (Toradex VF50):
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: stable@vger.kernel.org # Requires trivial backporting, simple remove
# the 3rd argument from the calls to
# i2c_imx_bus_busy().
---
drivers/i2c/busses/i2c-imx.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 69ce5eea9b5a..e98356f3db84 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -615,6 +615,8 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx, bool atomic)
/* Stop I2C transaction */
dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
+ if (!(temp & I2CR_MSTA))
+ i2c_imx->stopped = 1;
temp &= ~(I2CR_MSTA | I2CR_MTX);
if (i2c_imx->dma)
temp &= ~I2CR_DMAEN;
@@ -778,9 +780,12 @@ static int i2c_imx_dma_read(struct imx_i2c_struct *i2c_imx,
*/
dev_dbg(dev, "<%s> clear MSTA\n", __func__);
temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
+ if (!(temp & I2CR_MSTA))
+ i2c_imx->stopped = 1;
temp &= ~(I2CR_MSTA | I2CR_MTX);
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR);
- i2c_imx_bus_busy(i2c_imx, 0, false);
+ if (!i2c_imx->stopped)
+ i2c_imx_bus_busy(i2c_imx, 0, false);
} else {
/*
* For i2c master receiver repeat restart operation like:
@@ -905,9 +910,12 @@ static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs,
dev_dbg(&i2c_imx->adapter.dev,
"<%s> clear MSTA\n", __func__);
temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
+ if (!(temp & I2CR_MSTA))
+ i2c_imx->stopped = 1;
temp &= ~(I2CR_MSTA | I2CR_MTX);
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR);
- i2c_imx_bus_busy(i2c_imx, 0, atomic);
+ if (!i2c_imx->stopped)
+ i2c_imx_bus_busy(i2c_imx, 0, atomic);
} else {
/*
* For i2c master receiver repeat restart operation like:
--
Christian Eggers
Embedded software developer
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [PATCH v6 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost
2020-10-09 11:03 ` [PATCH v6 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost Christian Eggers
@ 2020-10-10 11:09 ` Wolfram Sang
0 siblings, 0 replies; 11+ messages in thread
From: Wolfram Sang @ 2020-10-10 11:09 UTC (permalink / raw)
To: Christian Eggers
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski, stable
[-- Attachment #1: Type: text/plain, Size: 828 bytes --]
On Fri, Oct 09, 2020 at 01:03:20PM +0200, Christian Eggers wrote:
> If arbitration is lost, the master automatically changes to slave mode.
> I2SR_IBB may or may not be reset by hardware. Raising a STOP condition
> by resetting I2CR_MSTA has no effect and will not clear I2SR_IBB.
>
> So calling i2c_imx_bus_busy() is not required and would busy-wait until
> timeout.
>
> Signed-off-by: Christian Eggers <ceggers@arri.de>
> Tested (not extensively) on Vybrid VF500 (Toradex VF50):
> Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Cc: stable@vger.kernel.org # Requires trivial backporting, simple remove
> # the 3rd argument from the calls to
> # i2c_imx_bus_busy().
Applied to for-next, thanks!
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^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss
2020-10-09 11:03 [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Christian Eggers
` (2 preceding siblings ...)
2020-10-09 11:03 ` [PATCH v6 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost Christian Eggers
@ 2020-10-10 11:06 ` Wolfram Sang
2020-10-18 10:44 ` Christian Eggers
3 siblings, 1 reply; 11+ messages in thread
From: Wolfram Sang @ 2020-10-10 11:06 UTC (permalink / raw)
To: Christian Eggers
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski
[-- Attachment #1: Type: text/plain, Size: 203 bytes --]
> Changes in v5:
Changes in v6 were missing... Because patch 1 was updated, I reverted it
from for-current and will apply this series to for-next instead to give
it some more time for testing.
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss
2020-10-10 11:06 ` [PATCH v6 0/3] i2c: imx: Fix handling of arbitration loss Wolfram Sang
@ 2020-10-18 10:44 ` Christian Eggers
0 siblings, 0 replies; 11+ messages in thread
From: Christian Eggers @ 2020-10-18 10:44 UTC (permalink / raw)
To: Wolfram Sang
Cc: Oleksij Rempel, Oleksij Rempel, Shawn Guo, Sascha Hauer,
Fabio Estevam, Uwe Kleine-König, David Laight,
Pengutronix Kernel Team, NXP Linux Team, linux-i2c,
linux-arm-kernel, linux-kernel, Krzysztof Kozlowski
Hi Wolfram,
On Saturday, 10 October 2020, 13:06:58 CEST, Wolfram Sang wrote:
> > Changes in v5:
> Changes in v6 were missing... Because patch 1 was updated, I reverted it
> from for-current and will apply this series to for-next instead to give
> it some more time for testing.
can may patches be merged into for-current for -RC2 or RC3?
Best regards
Christian
^ permalink raw reply [flat|nested] 11+ messages in thread