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Thu, 21 May 2020 15:03:17 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE112.ent.ti.com (10.64.6.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Thu, 21 May 2020 15:03:17 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Thu, 21 May 2020 15:03:17 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 04LK3Gia014075; Thu, 21 May 2020 15:03:17 -0500 Date: Fri, 22 May 2020 01:33:15 +0530 From: Pratyush Yadav To: Boris Brezillon Subject: Re: [PATCH v6 04/19] spi: spi-mem: allow specifying a command's extension Message-ID: <20200521200313.bnil6a4u3dhiizr4@ti.com> References: <20200520163053.24357-1-p.yadav@ti.com> <20200520163053.24357-5-p.yadav@ti.com> <20200521202256.5816eb32@collabora.com> <20200521194129.3lqdormmcs4zadh2@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200521194129.3lqdormmcs4zadh2@ti.com> User-Agent: NeoMutt/20171215 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-20200521_130326_870331_5A95A20E X-CRM114-Status: GOOD ( 25.05 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Belloni , Mason Yang , Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , Sekhar Nori , Nicolas Ferre , linux-kernel@vger.kernel.org, Ludovic Desroches , Mark Brown , linux-mtd@lists.infradead.org, Miquel Raynal , Matthias Brugger , linux-mediatek@lists.infradead.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.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 On 22/05/20 01:11AM, Pratyush Yadav wrote: > On 21/05/20 08:22PM, Boris Brezillon wrote: > > On Wed, 20 May 2020 22:00:38 +0530 > > Pratyush Yadav wrote: > > > > > In xSPI mode, flashes expect 2-byte opcodes. The second byte is called > > > the "command extension". There can be 3 types of extensions in xSPI: > > > repeat, invert, and hex. When the extension type is "repeat", the same > > > opcode is sent twice. When it is "invert", the second byte is the > > > inverse of the opcode. When it is "hex" an additional opcode byte based > > > is sent with the command whose value can be anything. > > > > > > So, make opcode a 16-bit value and add a 'nbytes', similar to how > > > multiple address widths are handled. > > > > > > Signed-off-by: Pratyush Yadav > > > --- > > > include/linux/spi/spi-mem.h | 5 ++++- > > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > > > diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h > > > index e3dcb956bf61..731bb64c6ba6 100644 > > > --- a/include/linux/spi/spi-mem.h > > > +++ b/include/linux/spi/spi-mem.h > > > @@ -69,6 +69,8 @@ enum spi_mem_data_dir { > > > > > > /** > > > * struct spi_mem_op - describes a SPI memory operation > > > + * @cmd.nbytes: number of opcode bytes (only 1 or 2 are valid). The opcode is > > > + * sent MSB-first. > > > * @cmd.buswidth: number of IO lines used to transmit the command > > > * @cmd.opcode: operation opcode > > > * @cmd.dtr: whether the command opcode should be sent in DTR mode or not > > > @@ -94,9 +96,10 @@ enum spi_mem_data_dir { > > > */ > > > struct spi_mem_op { > > > struct { > > > + u8 nbytes; > > > u8 buswidth; > > > u8 dtr : 1; > > > - u8 opcode; > > > + u16 opcode; > > > } cmd; > > > > > > struct { > > > > As mentioned in one of my previous review, you should patch the mxic > > driver before extending the opcode field: > > IIUC, this patchset doesn't break original functionality of the driver. > It will work like before with 1-byte opcodes. So I don't think it is the > responsibility of this patchset to enhance the driver. It didn't work > before with 2-byte opcodes, it won't work now. IMO this should be a > separate, independent change. Scratch that. Big/little endian issue. If you'd drop your Signed-off-by, I'll write the commit message and patch it in. > > --->8--- > > diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c > > index 69491f3a515d..c3f4136a7c1d 100644 > > --- a/drivers/spi/spi-mxic.c > > +++ b/drivers/spi/spi-mxic.c > > @@ -356,6 +356,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem, > > int nio = 1, i, ret; > > u32 ss_ctrl; > > u8 addr[8]; > > + u8 cmd[2]; > > > > ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz); > > if (ret) > > @@ -393,7 +394,10 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem, > > writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT, > > mxic->regs + HC_CFG); > > > > - ret = mxic_spi_data_xfer(mxic, &op->cmd.opcode, NULL, 1); > > + for (i = 0; i < op->cmd.nbytes; i++) > > + cmd[i] = op->cmd.opcode >> (8 * (op->cmd.nbytes - i - 1)); > > + > > + ret = mxic_spi_data_xfer(mxic, cmd, NULL, op->cmd.nbytes); > > if (ret) > > goto out; > > -- Regards, Pratyush Yadav Texas Instruments India ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/