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SubjectRe: [PATCH net-next-2.6 v2] can: Topcliff: PCH_CAN driver: Add Flow control,
Hello,

On 11/15/2010 09:30 AM, Tomoya MORINAGA wrote:
> * Add Flow control
> * Fix Data copy issue (endianness)
> * Add Macro prefix "PCH_"
> * Separate interface register structure
> * Some functions are unified.
> * Change MessageObject indication(PCH_RX_OBJ_START, etc..)
> * Enumerate LEC macro
> * Move MSI processing from open/close to probe/remove processing
> * Use BIT(x)
> * and more...
>
> Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
> ---
> drivers/net/can/pch_can.c | 1348 ++++++++++++++++++++-------------------------
> 1 files changed, 595 insertions(+), 753 deletions(-)
>
> diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> index 6727182..6a38593 100644
> --- a/drivers/net/can/pch_can.c
> +++ b/drivers/net/can/pch_can.c
...
> - if (status & PCH_LEC_ALL) {
> + lec = status & PCH_LEC_ALL;
> + switch (lec) {
> + case PCH_STUF_ERR:
> + cf->data[2] |= CAN_ERR_PROT_STUFF;
> priv->can.can_stats.bus_error++;
> stats->rx_errors++;
> - switch (status & PCH_LEC_ALL) {
> - case PCH_STUF_ERR:
> - cf->data[2] |= CAN_ERR_PROT_STUFF;
> - break;
> - case PCH_FORM_ERR:
> - cf->data[2] |= CAN_ERR_PROT_FORM;
> - break;
> - case PCH_ACK_ERR:
> - cf->data[2] |= CAN_ERR_PROT_LOC_ACK |
> - CAN_ERR_PROT_LOC_ACK_DEL;
> - break;
> - case PCH_BIT1_ERR:
> - case PCH_BIT0_ERR:
> - cf->data[2] |= CAN_ERR_PROT_BIT;
> - break;
> - case PCH_CRC_ERR:
> - cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ |
> - CAN_ERR_PROT_LOC_CRC_DEL;
> - break;
> - default:
> - iowrite32(status | PCH_LEC_ALL, &priv->regs->stat);
> - break;
> - }
> -
> + break;
> + case PCH_FORM_ERR:
> + cf->data[2] |= CAN_ERR_PROT_FORM;
> + priv->can.can_stats.bus_error++;
> + stats->rx_errors++;
> + break;
> + case PCH_ACK_ERR:
> + cf->can_id |= CAN_ERR_ACK;
> + priv->can.can_stats.bus_error++;
> + stats->rx_errors++;
> + break;
> + case PCH_BIT1_ERR:
> + case PCH_BIT0_ERR:
> + cf->data[2] |= CAN_ERR_PROT_BIT;
> + priv->can.can_stats.bus_error++;
> + stats->rx_errors++;
> + break;
> + case PCH_CRC_ERR:
> + cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ |
> + CAN_ERR_PROT_LOC_CRC_DEL;
> + priv->can.can_stats.bus_error++;
> + stats->rx_errors++;
> + break;
> + case PCH_LEC_ALL: /* Written by CPU. No error status */
> + break;
> }

More comments to the lec handling below.

> + cf->data[6] = ioread32(&priv->regs->errc) & PCH_TEC;
> + cf->data[7] = (ioread32(&priv->regs->errc) & PCH_REC) >> 8;

Could be handle with just *one* register access.

...
> static int pch_can_rx_poll(struct napi_struct *napi, int quota)
> {
> struct net_device *ndev = napi->dev;
> struct pch_can_priv *priv = netdev_priv(ndev);
> - struct net_device_stats *stats = &(priv->ndev->stats);
> - u32 dlc;
> u32 int_stat;
> int rcv_pkts = 0;
> u32 reg_stat;
> - unsigned long flags;
>
> int_stat = pch_can_int_pending(priv);
> if (!int_stat)
> - return 0;
> + goto end;
>
> -INT_STAT:
> - if (int_stat == CAN_STATUS_INT) {
> + if ((int_stat == PCH_STATUS_INT) && (quota > 0)) {
> reg_stat = ioread32(&priv->regs->stat);
> if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) {
> - if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)
> + if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) {
> pch_can_error(ndev, reg_stat);
> + quota--;
> + }

Should be:

if (reg_stat & PCH_BUS_OFF ||
(reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) {
Your lec handling is still not correc, I believe. The driver needs to
write PCH_LEC_ALL to the "stat" register once in the initialization code
and then after each error observed (lec != PCH_LEC_ALL). I still do not
find such code. Could you show us the output of

"# candump any,0:0,#FFFFFFFF"
when yo send CAN messages *without* a cable connected?.

Thanks,

Wolfgang.


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