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Mon, 4 Feb 2019 07:36:42 -0600 Received: from DFLE113.ent.ti.com (10.64.6.34) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Mon, 4 Feb 2019 07:36:41 -0600 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Mon, 4 Feb 2019 07:36:41 -0600 Received: from [172.24.190.89] (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id x14DacNf020419; Mon, 4 Feb 2019 07:36:39 -0600 Subject: Re: [PATCH] mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode To: "Tudor.Ambarus@microchip.com" , "purna.chandra.mandal@intel.com" , "f.blogs@napier.co.nz" , "boris.brezillon@bootlin.com" , "richard@nod.at" References: <20190128050229.44965-1-purna.chandra.mandal@intel.com> <82eafaf8-803e-36a9-49ca-83d84c55537a@microchip.com> From: Vignesh R Message-ID: <7655324a-9cd2-7ffe-56bb-83c44740265c@ti.com> Date: Mon, 4 Feb 2019 19:07:39 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <82eafaf8-803e-36a9-49ca-83d84c55537a@microchip.com> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190204_053656_237993_87D9723E X-CRM114-Status: GOOD ( 19.70 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "marek.vasut@gmail.com" , "dwmw2@infradead.org" , "computersforpeace@gmail.com" , "linux-mtd@lists.infradead.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org 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 > > Looks good for me: > Reviewed-by: Tudor Ambarus > > 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 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/