linux-kernel - Re: [PATCH v4 1/1] can: add pruss CAN driver.

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Message-ID: <46D523E49EFF489F9B088AE7B9CD7286@subhasishg>
Date:	Wed, 27 Apr 2011 18:38:19 +0530
From:	"Subhasish Ghosh" <subhasish@...tralsolutions.com>
To:	"Wolfgang Grandegger" <wg@...ndegger.com>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>
Cc:	<sachi@...tralsolutions.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<Netdev@...r.kernel.org>, <nsekhar@...com>,
	"open list" <linux-kernel@...r.kernel.org>,
	"CAN NETWORK DRIVERS" <socketcan-core@...ts.berlios.de>,
	<m-watkins@...com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/1] can: add pruss CAN driver.

>
> - Use just *one* value per sysfs file

SG - I felt adding entry for each mbx_id will clutter the sysfs.
        Is it ok to do that.


>>> +static u32 pruss_intc_init[19][3] = {
>>> + {PRUSS_INTC_POLARITY0, PRU_INTC_REGMAP_MASK, 0xFFFFFFFF},
>>> + {PRUSS_INTC_POLARITY1, PRU_INTC_REGMAP_MASK, 0xFFFFFFFF},
>>> + {PRUSS_INTC_TYPE0, PRU_INTC_REGMAP_MASK, 0x1C000000},
>>> + {PRUSS_INTC_TYPE1, PRU_INTC_REGMAP_MASK, 0},
>>> + {PRUSS_INTC_GLBLEN, 0, 1},
>>> + {PRUSS_INTC_HOSTMAP0, PRU_INTC_REGMAP_MASK, 0x03020100},
>>> + {PRUSS_INTC_HOSTMAP1, PRU_INTC_REGMAP_MASK, 0x07060504},
>>> + {PRUSS_INTC_HOSTMAP2, PRU_INTC_REGMAP_MASK, 0x0000908},
>>> + {PRUSS_INTC_CHANMAP0, PRU_INTC_REGMAP_MASK, 0},
>>> + {PRUSS_INTC_CHANMAP8, PRU_INTC_REGMAP_MASK, 0x00020200},
>>> + {PRUSS_INTC_STATIDXCLR, 0, 32},
>>> + {PRUSS_INTC_STATIDXCLR, 0, 19},
>>> + {PRUSS_INTC_ENIDXSET, 0, 19},
>>> + {PRUSS_INTC_STATIDXCLR, 0, 18},
>>> + {PRUSS_INTC_ENIDXSET, 0, 18},
>>> + {PRUSS_INTC_STATIDXCLR, 0, 34},
>>> + {PRUSS_INTC_ENIDXSET, 0, 34},
>>> + {PRUSS_INTC_ENIDXSET, 0, 32},
>>> + {PRUSS_INTC_HOSTINTEN, 0, 5}
>>
>> please add ","
>
> Also a struct to describe each entry would improve readability.
> Then you could also use ARRAY_SIZE.

SG _ I could not follow this, are you recommending that I create a structure 
with three variables and then create
            an array for it.
something like:

const static struct [] = {
    {
    unsigned int reg_base;
    unsigned int reg_mask;
    unsigned int reg_val;
    },
...
};


>>> + value = (PRUSS_CAN_GPIO_SETUP_DELAY *
>>> + (priv->clk_freq_pru / 1000000) / 1000) /
>>> + PRUSS_CAN_DELAY_LOOP_LENGTH;
>
> This calculation looks delicate. 64-bit math would be safer.

SG - This one works fine. I am dividing it twice to avoid the problem.


>>> + pru_can_mask_ints(priv->dev, PRUSS_CAN_TX_PRU_1, false);
>>> + pru_can_mask_ints(priv->dev, PRUSS_CAN_RX_PRU_0, false);
>>> + can_bus_off(ndev);
>>> + dev_dbg(priv->ndev->dev.parent, "Bus off mode\n");
>>> + }
>>> +
>>> + netif_rx(skb);
>
> You should use netif_receive_skb(skb) here as well.

SG - Ok, Will do.

>
> if (PRUSS_CAN_ISR_BIT_ESI &
>     priv->can_rx_cntx.intr_stat) {
>
> Is more readable.

SG - Ok, Will do.

>
>
>>> + pru_can_gbl_stat_get(priv->dev,
>>> + &priv->can_rx_cntx);
>>> + pru_can_err(ndev,
>>> + priv->can_rx_cntx.intr_stat,
>>> + priv->can_rx_cntx.gbl_stat);
>
> Please fix bogous indention.

SG - Ok, Will do.


>>> +
>>> + pdata = dev->platform_data;
>>> + if (!pdata) {
>>> + dev_err(&pdev->dev, "platform data not found\n");
>>> + return -EINVAL;
>>> + }
>>> + (pdata->setup)();
>>
>> no need fot the ( )

SG - Ok, Will do.

>>> + }
>>> +
>>> + priv->ndev = ndev;
>>> + priv->dev = dev;
>>> +
>>> + priv->can.bittiming_const = &pru_can_bittiming_const;
>>> + priv->can.do_set_bittiming = pru_can_set_bittiming;
>>> + priv->can.do_set_mode = pru_can_set_mode;
>>> + priv->can.do_get_state = pru_can_get_state;
>
> Please remove that callback. It's not needed as state changes are
> handled properly.
>

SG -- Ok, Will do

 

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