linux-kernel - Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Date:   Mon, 20 Apr 2020 11:28:13 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, arnd@...db.de,
        brendanhiggins@...gle.com, tglx@...utronix.de,
        boris.brezillon@...labora.com, anders.roxell@...aro.org,
        masonccyang@...c.com.tw, piotrs@...ence.com, robh+dt@...nel.org,
        linux-mips@...r.kernel.org, hauke.mehrtens@...el.com,
        qi-ming.wu@...el.com, cheol.yong.kim@...el.com
Subject: Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel
 LGM SoC

Hi Andy,

   Thank you very much for the review comments and your time...

On 20/4/2020 6:28 am, Andy Shevchenko wrote:
> On Fri, Apr 17, 2020 at 04:21:47PM +0800, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>
>> This patch adds the new IP of Nand Flash Controller(NFC) support
>> on Intel's Lightning Mountain(LGM) SoC.
>>
>> DMA is used for burst data transfer operation, also DMA HW supports
>> aligned 32bit memory address and aligned data access by default.
>> DMA burst of 8 supported. Data register used to support the read/write
>> operation from/to device.
>>
>> NAND controller driver implements ->exec_op() to replace legacy hooks,
>> these specific call-back method to execute NAND operations.
> I guess untested version slipped into mailing list...
> See below why.

Sorry, This is original patch only , header files are mis-aligned so 
looks like un-tested patch.

> ...
>
>> +#include <linux/clk.h>
>> +#include <linux/completion.h>
>> +#include <linux/dmaengine.h>
>> +#include <linux/dma-direction.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/err.h>
>> +#include <linux/init.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/resource.h>
>> +#include <linux/sched.h>
>> +#include <linux/types.h>
>> +#include <linux/mtd/mtd.h>
>> +#include <linux/mtd/rawnand.h>
>> +#include <linux/mtd/nand_ecc.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/of.h>
> Do you need this?
Noted, will check and drop if it is notnecessary.
>> +#include <linux/mtd/partitions.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <mtd/mtd-abi.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/mtd/nand.h>
> Basically, do you need all of them?
>
> And maybe keep them in order?
Sure, will update.
> ...
>
>> +static int lgm_dma_init(struct device *dev, struct lgm_nand_host *lgm_host)
>> +{
>> +	int ret;
>> +
>> +	/* Prepare for TX DMA: */
>> +	lgm_host->dma_tx = dma_request_chan(dev, "tx");
>> +	if (IS_ERR(lgm_host->dma_tx)) {
>> +		ret = PTR_ERR(lgm_host->dma_tx);
>> +		dev_err(dev, "can't get the TX DMA channel, error %d!\n", ret);
>> +		goto err;
>> +	}
>> +
>> +	/* Prepare for RX: */
>> +	lgm_host->dma_rx = dma_request_chan(dev, "rx");
>> +	if (IS_ERR(lgm_host->dma_rx)) {
>> +		ret = PTR_ERR(lgm_host->dma_rx);
>> +		dev_err(dev, "can't get the RX DMA channel, error %d\n", ret);
> I suspect this error path hasn't been tested. I don't see where tx channel
> freeing is happening.
Good catch, Thanks!, will update
>> +		goto err;
>> +	}
>> +
>> +	return 0;
>> +err:
>> +	return ret;
> Redundant label.
Noted.
>> +}
> ...
>
>> +	res = devm_platform_ioremap_resource_byname(pdev, lgm_host->cs_name);
>> +	lgm_host->nandaddr_va = res;
>> +	nandaddr_pa = res->start;
>> +	if (IS_ERR(lgm_host->nandaddr_va))
>> +		return PTR_ERR(lgm_host->nandaddr_va);
> I'm wonderig what is this.  How is it even compile?

Agreed!, need a correction, but it's compiled.

Regards
Vadivel
>