From: Boris Brezillon <boris.brezillon@collabora.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Michal Simek <monstr@monstr.eu>,
Vignesh Raghavendra <vigneshr@ti.com>,
Tudor Ambarus <Tudor.Ambarus@microchip.com>,
Richard Weinberger <richard@nod.at>,
linux-mtd@lists.infradead.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Naga Sureshkumar Relli <nagasure@xilinx.com>
Subject: Re: [PATCH 6/8] mtd: rawnand: onfi: Simplify the NAND operations during detection
Date: Wed, 22 Apr 2020 09:00:52 +0200 [thread overview]
Message-ID: <20200422090052.5f27a42c@collabora.com> (raw)
In-Reply-To: <20200421164637.8086-7-miquel.raynal@bootlin.com>
On Tue, 21 Apr 2020 18:46:35 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> There is no need for separate parameter page reads, the delay penalty
> is negligible so let's do read the three copies in one go.
^let's read
In theory that's correct, but I fear this was done because some
controllers couldn't read 768 bytes in one go. Could we do that only if
the controller implements exec_op() and exec_op(check_only) returns true?
>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
> drivers/mtd/nand/raw/nand_onfi.c | 8 +-------
> 1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
> index d6124180b47b..b76772666b82 100644
> --- a/drivers/mtd/nand/raw/nand_onfi.c
> +++ b/drivers/mtd/nand/raw/nand_onfi.c
> @@ -160,19 +160,13 @@ int nand_onfi_detect(struct nand_chip *chip)
> if (!pbuf)
> return -ENOMEM;
>
> - ret = nand_read_param_page_op(chip, 0, NULL, 0);
> + ret = nand_read_param_page_op(chip, 0, pbuf, 3 * sizeof(*pbuf));
> if (ret) {
> ret = 0;
> goto free_onfi_param_page;
> }
>
> for (i = 0; i < 3; i++) {
> - ret = nand_read_data_op(chip, &pbuf[i], sizeof(*pbuf), true);
> - if (ret) {
> - ret = 0;
> - goto free_onfi_param_page;
> - }
> -
> crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)&pbuf[i], 254);
> if (crc == le16_to_cpu(pbuf[i].crc)) {
> p = &pbuf[i];
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next prev parent reply other threads:[~2020-04-22 7:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 16:46 [PATCH 0/8] Misc timing changes Miquel Raynal
2020-04-21 16:46 ` [PATCH 1/8] mtd: rawnand: timings: Add mode information to the timings structure Miquel Raynal
2020-04-22 6:36 ` Boris Brezillon
2020-04-21 16:46 ` [PATCH 2/8] mtd: rawnand: timings: Fix default tR_max and tCCS_min timings Miquel Raynal
2020-04-22 6:47 ` Boris Brezillon
2020-04-21 16:46 ` [PATCH 3/8] mtd: rawnand: onfi: Fix redundancy detection check Miquel Raynal
2020-04-22 6:49 ` Boris Brezillon
2020-04-21 16:46 ` [PATCH 4/8] mtd: rawnand: onfi: Use an intermediate variable to decomplefixy conditions Miquel Raynal
2020-04-22 6:51 ` Boris Brezillon
2020-04-21 16:46 ` [PATCH 5/8] mtd: rawnand: onfi: Avoid doing a copy of the parameter page Miquel Raynal
2020-04-22 6:54 ` Boris Brezillon
2020-04-21 16:46 ` [PATCH 6/8] mtd: rawnand: onfi: Simplify the NAND operations during detection Miquel Raynal
2020-04-22 7:00 ` Boris Brezillon [this message]
2020-04-22 7:25 ` Miquel Raynal
2020-04-21 16:46 ` [PATCH 7/8] mtd: rawnand: jedec: Use an intermediate variable to decomplefixy conditions Miquel Raynal
2020-04-22 7:02 ` Boris Brezillon
2020-04-22 8:49 ` Sergei Shtylyov
2020-04-22 9:33 ` Miquel Raynal
2020-04-21 16:46 ` [PATCH 8/8] mtd: rawnand: jedec: Simplify the NAND operations during detection Miquel Raynal
2020-04-22 7:05 ` Boris Brezillon
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