From: Vignesh R <vigneshr@ti.com>
To: "Tudor.Ambarus@microchip.com" <Tudor.Ambarus@microchip.com>,
"purna.chandra.mandal@intel.com" <purna.chandra.mandal@intel.com>,
"f.blogs@napier.co.nz" <f.blogs@napier.co.nz>,
"boris.brezillon@bootlin.com" <boris.brezillon@bootlin.com>,
"richard@nod.at" <richard@nod.at>
Cc: "marek.vasut@gmail.com" <marek.vasut@gmail.com>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"computersforpeace@gmail.com" <computersforpeace@gmail.com>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode
Date: Mon, 4 Feb 2019 19:07:39 +0530 [thread overview]
Message-ID: <7655324a-9cd2-7ffe-56bb-83c44740265c@ti.com> (raw)
In-Reply-To: <82eafaf8-803e-36a9-49ca-83d84c55537a@microchip.com>
Hi,
On 03/02/19 5:50 PM, Tudor.Ambarus@microchip.com wrote:
> + Vignesh
>
Thanks for looping in.
> On 01/28/2019 07:02 AM, Purna Chandra Mandal wrote:
>> cadence-quadspi controller allows upto eight bytes of data to
>> be written in software Triggered Instruction generator (STIG) mode
>> of operation. Lower 4 bytes are written through writedatalower and
>> upper 4 bytes by writedataupper register.
>>
>> This patch allows all the 8 bytes to be written.
>>
Code as such looks fine. But, how was this tested? How can I trigger
this new code path with current linux-next? AFAICS, STIG mode write is
used to in nor->write_reg() path, and I dont see any nor->write_reg()
call with >4bytes len.
>> Signed-off-by: Purna Chandra Mandal <purna.chandra.mandal@intel.com>
>
> Looks good for me:
> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
>
> Vignesh, can we have your R-b or T-b tag?
>
> Cheers,
> ta
>
>> ---
>>
>> drivers/mtd/spi-nor/cadence-quadspi.c | 15 ++++++++++++---
>> 1 file changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
>> index 04cedd3a2bf6..7f78f9409ddd 100644
>> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
>> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
>> @@ -418,9 +418,10 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
>> void __iomem *reg_base = cqspi->iobase;
>> unsigned int reg;
>> unsigned int data;
>> + u32 write_len;
>> int ret;
>>
>> - if (n_tx > 4 || (n_tx && !txbuf)) {
>> + if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
>> dev_err(nor->dev,
>> "Invalid input argument, cmdlen %d txbuf 0x%p\n",
>> n_tx, txbuf);
>> @@ -433,10 +434,18 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
>> reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
>> << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
>> data = 0;
>> - memcpy(&data, txbuf, n_tx);
>> + write_len = (n_tx > 4) ? 4 : n_tx;
>> + memcpy(&data, txbuf, write_len);
>> + txbuf += write_len;
>> writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
>> - }
>>
>> + if (n_tx > 4) {
>> + data = 0;
>> + write_len = n_tx - 4;
>> + memcpy(&data, txbuf, write_len);
>> + writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
>> + }
>> + }
>> ret = cqspi_exec_flash_cmd(cqspi, reg);
>> return ret;
>> }
>>
--
Regards
Vignesh
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next prev parent reply other threads:[~2019-02-04 13:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-28 5:02 [PATCH] mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode Purna Chandra Mandal
2019-02-03 12:20 ` Tudor.Ambarus
2019-02-04 13:37 ` Vignesh R [this message]
2019-02-05 7:00 ` Mandal, Purna Chandra
2019-02-05 10:00 ` Vignesh R
2019-02-10 18:56 ` Boris Brezillon
-- strict thread matches above, loose matches on Subject: below --
2018-12-14 2:15 [PATCH] " Purna Chandra Mandal
2019-01-21 9:37 ` Tudor.Ambarus
2019-01-28 4:57 ` Mandal, Purna Chandra
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