linux-kernel - Re: [RFC PATCH v5 2/6] mtd: rawnand: meson: wait for command in polling mode

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Message-ID: <439ff8b6-4282-08f7-46ef-425c0c009f09@sberdevices.ru>
Date:   Thu, 1 Jun 2023 10:57:47 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     <oxffffaa@...il.com>, <kernel@...rdevices.ru>,
        <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v5 2/6] mtd: rawnand: meson: wait for command in
 polling mode



On 01.06.2023 09:18, Arseniy Krasnov wrote:
> This adds support of waiting for command completion in sofyware polling

                                                         ^^^ will fix it

> mode. It is needed when ready/busy pin is not implemented in hardware.
> 
> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
> ---
>  drivers/mtd/nand/raw/meson_nand.c | 53 ++++++++++++++++++-------------
>  1 file changed, 31 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index 9dd4a676497b..82a629025adc 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -179,6 +179,7 @@ struct meson_nfc {
>  	u32 info_bytes;
>  
>  	unsigned long assigned_cs;
> +	bool use_polling;
>  };
>  
>  enum {
> @@ -392,32 +393,38 @@ static void meson_nfc_set_data_oob(struct nand_chip *nand,
>  	}
>  }
>  
> -static int meson_nfc_queue_rb(struct meson_nfc *nfc, int timeout_ms)
> +static int meson_nfc_queue_rb(struct nand_chip *nand, int timeout_ms)
>  {
> -	u32 cmd, cfg;
> -	int ret = 0;
> +	struct meson_nfc *nfc = nand_get_controller_data(nand);
>  
> -	meson_nfc_cmd_idle(nfc, nfc->timing.twb);
> -	meson_nfc_drain_cmd(nfc);
> -	meson_nfc_wait_cmd_finish(nfc, CMD_FIFO_EMPTY_TIMEOUT);
> +	if (nfc->use_polling) {
> +		return nand_soft_waitrdy(nand, timeout_ms);
> +	} else {
> +		u32 cmd, cfg;
> +		int ret = 0;
>  
> -	cfg = readl(nfc->reg_base + NFC_REG_CFG);
> -	cfg |= NFC_RB_IRQ_EN;
> -	writel(cfg, nfc->reg_base + NFC_REG_CFG);
> +		meson_nfc_cmd_idle(nfc, nfc->timing.twb);
> +		meson_nfc_drain_cmd(nfc);
> +		meson_nfc_wait_cmd_finish(nfc, CMD_FIFO_EMPTY_TIMEOUT);
>  
> -	reinit_completion(&nfc->completion);
> +		cfg = readl(nfc->reg_base + NFC_REG_CFG);
> +		cfg |= NFC_RB_IRQ_EN;
> +		writel(cfg, nfc->reg_base + NFC_REG_CFG);
>  
> -	/* use the max erase time as the maximum clock for waiting R/B */
> -	cmd = NFC_CMD_RB | NFC_CMD_RB_INT
> -		| nfc->param.chip_select | nfc->timing.tbers_max;
> -	writel(cmd, nfc->reg_base + NFC_REG_CMD);
> +		reinit_completion(&nfc->completion);
>  
> -	ret = wait_for_completion_timeout(&nfc->completion,
> -					  msecs_to_jiffies(timeout_ms));
> -	if (ret == 0)
> -		ret = -1;
> +		/* use the max erase time as the maximum clock for waiting R/B */
> +		cmd = NFC_CMD_RB | NFC_CMD_RB_INT
> +			| nfc->param.chip_select | nfc->timing.tbers_max;
> +		writel(cmd, nfc->reg_base + NFC_REG_CMD);
>  
> -	return ret;
> +		ret = wait_for_completion_timeout(&nfc->completion,
> +						  msecs_to_jiffies(timeout_ms));
> +		if (ret == 0)
> +			return -ETIMEDOUT;
> +
> +		return 0;
> +	}
>  }
>  
>  static void meson_nfc_set_user_byte(struct nand_chip *nand, u8 *oob_buf)
> @@ -623,7 +630,7 @@ static int meson_nfc_rw_cmd_prepare_and_execute(struct nand_chip *nand,
>  	if (in) {
>  		nfc->cmdfifo.rw.cmd1 = cs | NFC_CMD_CLE | NAND_CMD_READSTART;
>  		writel(nfc->cmdfifo.rw.cmd1, nfc->reg_base + NFC_REG_CMD);
> -		meson_nfc_queue_rb(nfc, PSEC_TO_MSEC(sdr->tR_max));
> +		meson_nfc_queue_rb(nand, PSEC_TO_MSEC(sdr->tR_max));
>  	} else {
>  		meson_nfc_cmd_idle(nfc, nfc->timing.tadl);
>  	}
> @@ -669,7 +676,7 @@ static int meson_nfc_write_page_sub(struct nand_chip *nand,
>  
>  	cmd = nfc->param.chip_select | NFC_CMD_CLE | NAND_CMD_PAGEPROG;
>  	writel(cmd, nfc->reg_base + NFC_REG_CMD);
> -	meson_nfc_queue_rb(nfc, PSEC_TO_MSEC(sdr->tPROG_max));
> +	meson_nfc_queue_rb(nand, PSEC_TO_MSEC(sdr->tPROG_max));
>  
>  	meson_nfc_dma_buffer_release(nand, data_len, info_len, DMA_TO_DEVICE);
>  
> @@ -952,7 +959,7 @@ static int meson_nfc_exec_op(struct nand_chip *nand,
>  			break;
>  
>  		case NAND_OP_WAITRDY_INSTR:
> -			meson_nfc_queue_rb(nfc, instr->ctx.waitrdy.timeout_ms);
> +			meson_nfc_queue_rb(nand, instr->ctx.waitrdy.timeout_ms);
>  			if (instr->delay_ns)
>  				meson_nfc_cmd_idle(nfc, delay_idle);
>  			break;
> @@ -1412,6 +1419,8 @@ static int meson_nfc_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	nfc->use_polling = of_property_read_bool(dev->of_node, "polling");
> +
>  	writel(0, nfc->reg_base + NFC_REG_CFG);
>  	ret = devm_request_irq(dev, irq, meson_nfc_irq, 0, dev_name(dev), nfc);
>  	if (ret) {