* RFC [PATCH v2 1/2] can: flexcan: fix mailbox initialization @ 2014-09-02 15:03 Marc Kleine-Budde 2014-09-02 15:03 ` RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes Marc Kleine-Budde 2014-09-02 15:03 ` RFC: [PATCH v2 2/2] can: flexcan: increase FLEXCAN_MCR_MAXMB() macro to 7 bits Marc Kleine-Budde 0 siblings, 2 replies; 7+ messages in thread From: Marc Kleine-Budde @ 2014-09-02 15:03 UTC (permalink / raw) To: linux-can; +Cc: david Picking up David's patch.... ^ permalink raw reply [flat|nested] 7+ messages in thread
* RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes 2014-09-02 15:03 RFC [PATCH v2 1/2] can: flexcan: fix mailbox initialization Marc Kleine-Budde @ 2014-09-02 15:03 ` Marc Kleine-Budde 2014-09-03 6:58 ` David Jander 2014-09-03 14:34 ` David Jander 2014-09-02 15:03 ` RFC: [PATCH v2 2/2] can: flexcan: increase FLEXCAN_MCR_MAXMB() macro to 7 bits Marc Kleine-Budde 1 sibling, 2 replies; 7+ messages in thread From: Marc Kleine-Budde @ 2014-09-02 15:03 UTC (permalink / raw) To: linux-can; +Cc: david, Marc Kleine-Budde From: David Jander <david@protonic.nl> Apparently mailboxes may contain random data at startup, causing some of them being prepared for message reception. This causes overruns being missed or even confusing the IRQ check for trasmitted messages, increasing the transmit counter instead of the error counter. Signed-off-by: David Jander <david@protonic.nl> [mkl: adjust starting value of loop] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- Changes since v1: - don't remove existing initialization of FLEXCAN_TX_BUF_ID - start loop at FLEXCAN_TX_BUF_ID + 1 Marc drivers/net/can/flexcan.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 630c7bf..6ec49bd 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -801,6 +801,7 @@ static int flexcan_chip_start(struct net_device *dev) struct flexcan_regs __iomem *regs = priv->base; int err; u32 reg_mcr, reg_ctrl; + int i; /* enable module */ err = flexcan_chip_enable(priv); @@ -870,6 +871,11 @@ static int flexcan_chip_start(struct net_device *dev) /* Abort any pending TX, mark Mailbox as INACTIVE */ flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); + /* Clear and invalidate all mailboxes first */ + for (i = FLEXCAN_TX_BUF_ID + 1; i < ARRAY_SIZE(regs->cantxfg; i++) { + flexcan_write(FLEXCAN_MB_CNT_CODE(0), + ®s->cantxfg[i].can_ctrl); + } /* acceptance mask/acceptance code (accept everything) */ flexcan_write(0x0, ®s->rxgmask); -- 2.1.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes 2014-09-02 15:03 ` RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes Marc Kleine-Budde @ 2014-09-03 6:58 ` David Jander 2014-09-03 9:18 ` Marc Kleine-Budde 2014-09-03 14:34 ` David Jander 1 sibling, 1 reply; 7+ messages in thread From: David Jander @ 2014-09-03 6:58 UTC (permalink / raw) To: Marc Kleine-Budde; +Cc: linux-can On Tue, 2 Sep 2014 17:03:35 +0200 Marc Kleine-Budde <mkl@pengutronix.de> wrote: > From: David Jander <david@protonic.nl> > > Apparently mailboxes may contain random data at startup, causing some of > them being prepared for message reception. This causes overruns being > missed or even confusing the IRQ check for trasmitted messages, increasing > the transmit counter instead of the error counter. > > Signed-off-by: David Jander <david@protonic.nl> > [mkl: adjust starting value of loop] > Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> > --- > Changes since v1: > - don't remove existing initialization of FLEXCAN_TX_BUF_ID > - start loop at FLEXCAN_TX_BUF_ID + 1 > > Marc > > drivers/net/can/flexcan.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c > index 630c7bf..6ec49bd 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -801,6 +801,7 @@ static int flexcan_chip_start(struct net_device *dev) > struct flexcan_regs __iomem *regs = priv->base; > int err; > u32 reg_mcr, reg_ctrl; > + int i; > > /* enable module */ > err = flexcan_chip_enable(priv); > @@ -870,6 +871,11 @@ static int flexcan_chip_start(struct net_device *dev) > /* Abort any pending TX, mark Mailbox as INACTIVE */ > flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), > ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); > + /* Clear and invalidate all mailboxes first */ > + for (i = FLEXCAN_TX_BUF_ID + 1; i < ARRAY_SIZE(regs->cantxfg; i++) { > + flexcan_write(FLEXCAN_MB_CNT_CODE(0), > + ®s->cantxfg[i].can_ctrl); > + } > > /* acceptance mask/acceptance code (accept everything) */ > flexcan_write(0x0, ®s->rxgmask); This assumes that FLEXCAN_TX_BUF_ID is the ID of the first available MB. Other than that, it should work I believe. OTOH, since this loop is more like a memset(...0...), wouldn't it be nice to just clear all MB's CODE registers and then initialize TX_BUF (and others) afterwards? Best regards, -- David Jander Protonic Holland. ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes 2014-09-03 6:58 ` David Jander @ 2014-09-03 9:18 ` Marc Kleine-Budde 0 siblings, 0 replies; 7+ messages in thread From: Marc Kleine-Budde @ 2014-09-03 9:18 UTC (permalink / raw) To: David Jander; +Cc: linux-can [-- Attachment #1: Type: text/plain, Size: 2914 bytes --] On 09/03/2014 08:58 AM, David Jander wrote: > On Tue, 2 Sep 2014 17:03:35 +0200 > Marc Kleine-Budde <mkl@pengutronix.de> wrote: > >> From: David Jander <david@protonic.nl> >> >> Apparently mailboxes may contain random data at startup, causing some of >> them being prepared for message reception. This causes overruns being >> missed or even confusing the IRQ check for trasmitted messages, increasing >> the transmit counter instead of the error counter. >> >> Signed-off-by: David Jander <david@protonic.nl> >> [mkl: adjust starting value of loop] >> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> >> --- >> Changes since v1: >> - don't remove existing initialization of FLEXCAN_TX_BUF_ID >> - start loop at FLEXCAN_TX_BUF_ID + 1 >> >> Marc >> >> drivers/net/can/flexcan.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c >> index 630c7bf..6ec49bd 100644 >> --- a/drivers/net/can/flexcan.c >> +++ b/drivers/net/can/flexcan.c >> @@ -801,6 +801,7 @@ static int flexcan_chip_start(struct net_device *dev) >> struct flexcan_regs __iomem *regs = priv->base; >> int err; >> u32 reg_mcr, reg_ctrl; >> + int i; >> >> /* enable module */ >> err = flexcan_chip_enable(priv); >> @@ -870,6 +871,11 @@ static int flexcan_chip_start(struct net_device *dev) >> /* Abort any pending TX, mark Mailbox as INACTIVE */ >> flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), >> ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); >> + /* Clear and invalidate all mailboxes first */ >> + for (i = FLEXCAN_TX_BUF_ID + 1; i < ARRAY_SIZE(regs->cantxfg; i++) { >> + flexcan_write(FLEXCAN_MB_CNT_CODE(0), >> + ®s->cantxfg[i].can_ctrl); >> + } >> >> /* acceptance mask/acceptance code (accept everything) */ >> flexcan_write(0x0, ®s->rxgmask); > > This assumes that FLEXCAN_TX_BUF_ID is the ID of the first available MB. Other > than that, it should work I believe. > OTOH, since this loop is more like a memset(...0...), wouldn't it be nice to > just clear all MB's CODE registers and then initialize TX_BUF (and others) > afterwards? See patch v3, I've changed the order, first do the loop, then initialize FLEXCAN_TX_BUF_ID as 0x4. I've pushed this series to the testing branch of the linux-can repo on gitorious. Make your imx6 errata fix patch based on this branch. You probably have to change FLEXCAN_TX_BUF_ID and/or introduce a new define for the invalid mailbox. When your patch is ready we can look at the patches and see if it makes sense to shuffle some changes around. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 181 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes 2014-09-02 15:03 ` RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes Marc Kleine-Budde 2014-09-03 6:58 ` David Jander @ 2014-09-03 14:34 ` David Jander 2014-09-03 14:36 ` Marc Kleine-Budde 1 sibling, 1 reply; 7+ messages in thread From: David Jander @ 2014-09-03 14:34 UTC (permalink / raw) To: Marc Kleine-Budde; +Cc: linux-can On Tue, 2 Sep 2014 17:03:35 +0200 Marc Kleine-Budde <mkl@pengutronix.de> wrote: > From: David Jander <david@protonic.nl> > > Apparently mailboxes may contain random data at startup, causing some of > them being prepared for message reception. This causes overruns being > missed or even confusing the IRQ check for trasmitted messages, increasing > the transmit counter instead of the error counter. > > Signed-off-by: David Jander <david@protonic.nl> > [mkl: adjust starting value of loop] > Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> > --- > Changes since v1: > - don't remove existing initialization of FLEXCAN_TX_BUF_ID > - start loop at FLEXCAN_TX_BUF_ID + 1 > > Marc > > drivers/net/can/flexcan.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c > index 630c7bf..6ec49bd 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -801,6 +801,7 @@ static int flexcan_chip_start(struct net_device *dev) > struct flexcan_regs __iomem *regs = priv->base; > int err; > u32 reg_mcr, reg_ctrl; > + int i; > > /* enable module */ > err = flexcan_chip_enable(priv); > @@ -870,6 +871,11 @@ static int flexcan_chip_start(struct net_device *dev) > /* Abort any pending TX, mark Mailbox as INACTIVE */ > flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), > ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); > + /* Clear and invalidate all mailboxes first */ > + for (i = FLEXCAN_TX_BUF_ID + 1; i < ARRAY_SIZE(regs->cantxfg; i++) { Oops! You are missing a closing parenthesis in this line. I will assume you amend this commit and base mine on top of that... > + flexcan_write(FLEXCAN_MB_CNT_CODE(0), > + ®s->cantxfg[i].can_ctrl); > + } > > /* acceptance mask/acceptance code (accept everything) */ > flexcan_write(0x0, ®s->rxgmask); Best regards, -- David Jander Protonic Holland. ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes 2014-09-03 14:34 ` David Jander @ 2014-09-03 14:36 ` Marc Kleine-Budde 0 siblings, 0 replies; 7+ messages in thread From: Marc Kleine-Budde @ 2014-09-03 14:36 UTC (permalink / raw) To: David Jander; +Cc: linux-can [-- Attachment #1: Type: text/plain, Size: 2194 bytes --] On 09/03/2014 04:34 PM, David Jander wrote: > On Tue, 2 Sep 2014 17:03:35 +0200 > Marc Kleine-Budde <mkl@pengutronix.de> wrote: > >> From: David Jander <david@protonic.nl> >> >> Apparently mailboxes may contain random data at startup, causing some of >> them being prepared for message reception. This causes overruns being >> missed or even confusing the IRQ check for trasmitted messages, increasing >> the transmit counter instead of the error counter. >> >> Signed-off-by: David Jander <david@protonic.nl> >> [mkl: adjust starting value of loop] >> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> >> --- >> Changes since v1: >> - don't remove existing initialization of FLEXCAN_TX_BUF_ID >> - start loop at FLEXCAN_TX_BUF_ID + 1 >> >> Marc >> >> drivers/net/can/flexcan.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c >> index 630c7bf..6ec49bd 100644 >> --- a/drivers/net/can/flexcan.c >> +++ b/drivers/net/can/flexcan.c >> @@ -801,6 +801,7 @@ static int flexcan_chip_start(struct net_device *dev) >> struct flexcan_regs __iomem *regs = priv->base; >> int err; >> u32 reg_mcr, reg_ctrl; >> + int i; >> >> /* enable module */ >> err = flexcan_chip_enable(priv); >> @@ -870,6 +871,11 @@ static int flexcan_chip_start(struct net_device *dev) >> /* Abort any pending TX, mark Mailbox as INACTIVE */ >> flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), >> ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); >> + /* Clear and invalidate all mailboxes first */ >> + for (i = FLEXCAN_TX_BUF_ID + 1; i < ARRAY_SIZE(regs->cantxfg; i++) { > > Oops! You are missing a closing parenthesis in this line. > I will assume you amend this commit and base mine on top of that... Doh! I introduced this problem, when converting the 64 to ARRAY_SIZE(...without the closing ). Fixed. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 181 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* RFC: [PATCH v2 2/2] can: flexcan: increase FLEXCAN_MCR_MAXMB() macro to 7 bits 2014-09-02 15:03 RFC [PATCH v2 1/2] can: flexcan: fix mailbox initialization Marc Kleine-Budde 2014-09-02 15:03 ` RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes Marc Kleine-Budde @ 2014-09-02 15:03 ` Marc Kleine-Budde 1 sibling, 0 replies; 7+ messages in thread From: Marc Kleine-Budde @ 2014-09-02 15:03 UTC (permalink / raw) To: linux-can; +Cc: david, Marc Kleine-Budde This patch increases the mask in the FLEXCAN_MCR_MAXMB() to 7 bits as in the newer flexcan cores the MAXMB field is 7 bits wide. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- Changes since v1: - new drivers/net/can/flexcan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 6ec49bd..44ba836 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -62,7 +62,7 @@ #define FLEXCAN_MCR_BCC BIT(16) #define FLEXCAN_MCR_LPRIO_EN BIT(13) #define FLEXCAN_MCR_AEN BIT(12) -#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x1f) +#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f) #define FLEXCAN_MCR_IDAM_A (0 << 8) #define FLEXCAN_MCR_IDAM_B (1 << 8) #define FLEXCAN_MCR_IDAM_C (2 << 8) -- 2.1.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-09-03 14:36 UTC | newest] Thread overview: 7+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2014-09-02 15:03 RFC [PATCH v2 1/2] can: flexcan: fix mailbox initialization Marc Kleine-Budde 2014-09-02 15:03 ` RFC: [PATCH v2 1/2] can: flexcan: Correctly initialize mailboxes Marc Kleine-Budde 2014-09-03 6:58 ` David Jander 2014-09-03 9:18 ` Marc Kleine-Budde 2014-09-03 14:34 ` David Jander 2014-09-03 14:36 ` Marc Kleine-Budde 2014-09-02 15:03 ` RFC: [PATCH v2 2/2] can: flexcan: increase FLEXCAN_MCR_MAXMB() macro to 7 bits Marc Kleine-Budde
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