linux-kernel - RE: [PATCH V2] can: xilinx_can: Fix missing Rx can packets on CANFD2.0

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Message-ID: <MN2PR02MB5727E5E2BF394AC2898D5E1FAF5D0@MN2PR02MB5727.namprd02.prod.outlook.com>
Date:   Wed, 4 Dec 2019 03:59:38 +0000
From:   Naga Sureshkumar Relli <nagasure@...inx.com>
To:     Srinivas Neeli <sneeli@...inx.com>,
        "wg@...ndegger.com" <wg@...ndegger.com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Michal Simek <michals@...inx.com>,
        Appana Durga Kedareswara Rao <appanad@...inx.com>
CC:     "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        git <git@...inx.com>, Srinivas Neeli <sneeli@...inx.com>
Subject: RE: [PATCH V2] can: xilinx_can: Fix missing Rx can packets on
 CANFD2.0

Reviewed-by: Naga Sureshkumar Relli	<naga.sureshkumar.relli@...inx.com>

> -----Original Message-----
> From: Srinivas Neeli <srinivas.neeli@...inx.com>
> Sent: Tuesday, December 3, 2019 5:47 PM
> To: wg@...ndegger.com; mkl@...gutronix.de; davem@...emloft.net; Michal Simek
> <michals@...inx.com>; Appana Durga Kedareswara Rao <appanad@...inx.com>
> Cc: linux-can@...r.kernel.org; netdev@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; git <git@...inx.com>; Naga
> Sureshkumar Relli <nagasure@...inx.com>; Srinivas Neeli <sneeli@...inx.com>
> Subject: [PATCH V2] can: xilinx_can: Fix missing Rx can packets on CANFD2.0
> 
> CANFD2.0 core uses BRAM for storing acceptance filter ID(AFID) and MASK
> (AFMASK)registers. So by default AFID and AFMASK registers contain random data. Due to
> random data, we are not able to receive all CAN ids.
> 
> Initializing AFID and AFMASK registers with Zero before enabling acceptance filter to
> receive all packets irrespective of ID and Mask.
> 
> Fixes: 0db9071353a0 ("can: xilinx: add can 2.0 support")
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> ---
>  drivers/net/can/xilinx_can.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index
> 464af939cd8a..c1dbab8c896d 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -60,6 +60,8 @@ enum xcan_reg {
>  	XCAN_TXMSG_BASE_OFFSET	= 0x0100, /* TX Message Space */
>  	XCAN_RXMSG_BASE_OFFSET	= 0x1100, /* RX Message Space */
>  	XCAN_RXMSG_2_BASE_OFFSET	= 0x2100, /* RX Message Space */
> +	XCAN_AFR_2_MASK_OFFSET	= 0x0A00, /* Acceptance Filter MASK */
> +	XCAN_AFR_2_ID_OFFSET	= 0x0A04, /* Acceptance Filter ID */
>  };
> 
>  #define XCAN_FRAME_ID_OFFSET(frame_base)	((frame_base) + 0x00)
> @@ -1809,6 +1811,11 @@ static int xcan_probe(struct platform_device *pdev)
> 
>  	pm_runtime_put(&pdev->dev);
> 
> +	if (priv->devtype.flags & XCAN_FLAG_CANFD_2) {
> +		priv->write_reg(priv, XCAN_AFR_2_ID_OFFSET, 0x00000000);
> +		priv->write_reg(priv, XCAN_AFR_2_MASK_OFFSET, 0x00000000);
> +	}
> +
>  	netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx buffers: actual %d, using
> %d\n",
>  		   priv->reg_base, ndev->irq, priv->can.clock.freq,
>  		   hw_tx_max, priv->tx_max);
> --
> 2.7.4