From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755084AbcB2Dnl (ORCPT ); Sun, 28 Feb 2016 22:43:41 -0500 Received: from mail-db3on0089.outbound.protection.outlook.com ([157.55.234.89]:20736 "EHLO emea01-db3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753644AbcB2Dnk convert rfc822-to-8bit (ORCPT ); Sun, 28 Feb 2016 22:43:40 -0500 From: Yunhui Cui To: Han Xu CC: Yunhui Cui , "dwmw2@infradead.org" , "computersforpeace@gmail.com" , "han.xu@freescale.com" , "linux-mtd@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Yao Yuan Subject: RE: [PATCH v2 3/4] mtd:spi-nor:fsl-quadspi:Add fast-read mode support Thread-Topic: [PATCH v2 3/4] mtd:spi-nor:fsl-quadspi:Add fast-read mode support Thread-Index: AQHRXOWrZTSlU9UhfkK8SRcZW35KvJ8womQAgAvoNZCAAiH4gIAD3EjA Date: Mon, 29 Feb 2016 03:43:36 +0000 Message-ID: References: <1454326208-4533-1-git-send-email-B56489@freescale.com> <1454326208-4533-3-git-send-email-B56489@freescale.com> <20160217180742.GB17485@shlinux2> <20160226163145.GA2182@shlinux2.ap.freescale.net> In-Reply-To: <20160226163145.GA2182@shlinux2.ap.freescale.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=nxp.com; x-originating-ip: [199.59.226.141] x-microsoft-exchange-diagnostics: 1;AM2PR04MB0724;5:y3dJeOgqQ0uONfS+kPgyaV7g66nfE2y1tXuh38ZxzJUkbuGNLrT6ae6cPFVSM6eGWRebRt3rYoycBZu+55MyH4M+0tFPK3C3GR8Fhu9rr6Yku+8LyUicwqOJk1Bntf0rCii5JYfCu1MdQH2EZ5bxiQ==;24:tgqPqNPNnPQ8Niq7oW5+qTBgj2KD6qMJAZ2qe+iMLwLIvsq63TlfLFFmr4LKQIA4RA0v56fVynzm4OKXjQOmLQmMKVPMh99XAQu2wcvmXZY= x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:AM2PR04MB0724; x-ms-office365-filtering-correlation-id: 2035ad4a-d534-4678-f69e-08d340ba8108 x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(601004)(2401047)(5005006)(8121501046)(3002001)(10201501046);SRVR:AM2PR04MB0724;BCL:0;PCL:0;RULEID:;SRVR:AM2PR04MB0724; x-forefront-prvs: 0867F4F1AA x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(6009001)(13464003)(377454003)(24454002)(3280700002)(1411001)(5004730100002)(5003600100002)(19580395003)(19580405001)(3660700001)(50986999)(2950100001)(5001960100002)(66066001)(110136002)(92566002)(74316001)(2900100001)(54356999)(93886004)(2906002)(5008740100001)(5002640100001)(3846002)(189998001)(102836003)(6116002)(4326007)(87936001)(77096005)(1096002)(15975445007)(11100500001)(1220700001)(586003)(40100003)(106116001)(76576001)(86362001)(33656002)(122556002)(7059030);DIR:OUT;SFP:1101;SCL:1;SRVR:AM2PR04MB0724;H:DB5PR0401MB1912.eurprd04.prod.outlook.com;FPR:;SPF:None;MLV:sfv;LANG:en; spamdiagnosticoutput: 1:23 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Feb 2016 03:43:36.0908 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM2PR04MB0724 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Han, But I don't think QuadSPI driver need to check the m25p,fast-read property again since spi-nor layer has already done that. Adding the property in flash node should work in the same way. [Yunhui]: There are three modes in fsl-quadspi driver , fast mode, quad mode, ddr quad read. The last parameter mode of spi_nor_scan() I have to specify . Otherwise, flash is still set to quad mode. spi-nor.c: 1419 if (mode == SPI_NOR_QUAD && info->flags & SPI_NOR_QUAD_READ) { 1420 ret = set_quad_mode(nor, info); 1421 if (ret) { 1422 dev_err(dev, "quad mode not supported\n"); 1423 return ret; 1424 } 1425 nor->flash_read = SPI_NOR_QUAD; 1426 } else if (mode == SPI_NOR_DUAL && info->flags & SPI_NOR_DUAL_READ) { 1427 nor->flash_read = SPI_NOR_DUAL; 1428 } Thanks Yunhui -----Original Message----- From: Han Xu [mailto:xhnjupt@gmail.com] Sent: Saturday, February 27, 2016 12:32 AM To: Yunhui Cui Cc: Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com; linux-mtd@lists.infradead.org; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; Yao Yuan Subject: Re: [PATCH v2 3/4] mtd:spi-nor:fsl-quadspi:Add fast-read mode support On Thu, Feb 25, 2016 at 08:07:22AM +0000, Yunhui Cui wrote: > Hi Han, > > I have provided the options " m25p,fast-read ", because there are probable some flashes can't support quad mode. > So we should support fast-read mode in our driver. Moreover, There is a option to select fast-read mode in spi_nor.c : > /* If we were instantiated by DT, use it */ > if (of_property_read_bool(np, "m25p,fast-read")) > nor->flash_read = SPI_NOR_FAST; Did you have some REAL cases using SPI NOR that only supports upto fast-read with Quad SPI driver? Neither fast-read or normal-read, which is actually more general, supported in the driver, just because I didn't see any REAL cases till now. I didn't run against the patch, although IMO it's not that necessary. But I don't think QuadSPI driver need to check the m25p,fast-read property again since spi-nor layer has already done that. Adding the property in flash node should work in the same way. > > Thanks > Yunhui > > -----Original Message----- > From: Han Xu [mailto:xhnjupt@gmail.com] > Sent: Thursday, February 18, 2016 2:08 AM > To: Yunhui Cui > Cc: dwmw2@infradead.org; computersforpeace@gmail.com; > han.xu@freescale.com; linux-mtd@lists.infradead.org; > linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; > Yao Yuan > Subject: Re: [PATCH v2 3/4] mtd:spi-nor:fsl-quadspi:Add fast-read mode > support > > On Mon, Feb 01, 2016 at 07:30:07PM +0800, Yunhui Cui wrote: > > The qspi driver add generic fast-read mode for different flash > > venders. There are some different board flash work on different > > mode, such fast-read, quad-mode. > > So we have to modify the third entrace parameter of spi_nor_scan(). > > > > Signed-off-by: Yunhui Cui > > --- > > drivers/mtd/spi-nor/fsl-quadspi.c | 27 +++++++++++++++++++++------ > > 1 file changed, 21 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c > > b/drivers/mtd/spi-nor/fsl-quadspi.c > > index 9861290..0a31cb1 100644 > > --- a/drivers/mtd/spi-nor/fsl-quadspi.c > > +++ b/drivers/mtd/spi-nor/fsl-quadspi.c > > @@ -389,11 +389,21 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q) > > /* Read */ > > lut_base = SEQID_READ * 4; > > > > - qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen), > > - base + QUADSPI_LUT(lut_base)); > > - qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) | > > - LUT1(FSL_READ, PAD4, rxfifo), > > - base + QUADSPI_LUT(lut_base + 1)); > > + if (nor->flash_read == SPI_NOR_FAST) { > > + qspi_writel(q, LUT0(CMD, PAD1, read_op) | > > + LUT1(ADDR, PAD1, addrlen), > > + base + QUADSPI_LUT(lut_base)); > > + qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) | > > + LUT1(FSL_READ, PAD1, rxfifo), > > + base + QUADSPI_LUT(lut_base + 1)); > > + } else if (nor->flash_read == SPI_NOR_QUAD) { > > + qspi_writel(q, LUT0(CMD, PAD1, read_op) | > > + LUT1(ADDR, PAD1, addrlen), > > + base + QUADSPI_LUT(lut_base)); > > + qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) | > > + LUT1(FSL_READ, PAD4, rxfifo), > > + base + QUADSPI_LUT(lut_base + 1)); > > + } > > > > /* Write enable */ > > lut_base = SEQID_WREN * 4; > > @@ -468,6 +478,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi > > *q, > > u8 cmd) { > > switch (cmd) { > > case SPINOR_OP_READ_1_1_4: > > + case SPINOR_OP_READ_FAST: > > return SEQID_READ; > > case SPINOR_OP_WREN: > > return SEQID_WREN; > > @@ -963,6 +974,7 @@ static int fsl_qspi_probe(struct platform_device *pdev) > > struct spi_nor *nor; > > struct mtd_info *mtd; > > int ret, i = 0; > > + enum read_mode mode = SPI_NOR_QUAD; > > > > q = devm_kzalloc(dev, sizeof(*q), GFP_KERNEL); > > if (!q) > > @@ -1064,7 +1076,10 @@ static int fsl_qspi_probe(struct platform_device *pdev) > > /* set the chip address for READID */ > > fsl_qspi_set_base_addr(q, nor); > > > > - ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD); > > + ret = of_property_read_bool(np, "m25p,fast-read"); > > + mode = (ret) ? SPI_NOR_FAST : SPI_NOR_QUAD; > > + > > + ret = spi_nor_scan(nor, NULL, mode); > > if (ret) > > goto mutex_failed; > > > I understand you want to provide a more generic read mode, but this is a quad spi driver, I prefer to provide the options, either quad read/quad IO read, or just normal read. > > -- > > 2.1.0.27.g96db324 > > > > > > ______________________________________________________ > > Linux MTD discussion mailing list > > http://lists.infradead.org/mailman/listinfo/linux-mtd/