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Tue, 21 Jun 2022 01:55:08 -0700 Envelope-to: miquel.raynal@bootlin.com, vigneshr@ti.com, git@amd.com, boris.brezillon@collabora.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, amit.kumar-mahapatra@amd.com, akumarma@amd.com Received: from [10.140.6.18] (port=52928 helo=xhdlakshmis40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1o3ZfA-0001C6-7b; Tue, 21 Jun 2022 01:55:08 -0700 From: Amit Kumar Mahapatra To: , CC: , , , , , , Amit Kumar Mahapatra Subject: [PATCH v2 1/2] mtd: rawnand: arasan: Update NAND bus clock instead of system clock Date: Tue, 21 Jun 2022 14:24:59 +0530 Message-ID: <20220621085500.1005-2-amit.kumar-mahapatra@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220621085500.1005-1-amit.kumar-mahapatra@xilinx.com> References: <20220621085500.1005-1-amit.kumar-mahapatra@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: bb0122d4-8e1c-419d-b76f-08da5363bec2 X-MS-TrafficTypeDiagnostic: PH0PR02MB8732:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jun 2022 08:55:09.2708 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bb0122d4-8e1c-419d-b76f-08da5363bec2 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: DM3NAM02FT034.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR02MB8732 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In current implementation the Arasan NAND driver is updating the system clock(i.e., anand->clk) in accordance to the timing modes (i.e., SDR or NVDDR). But as per the Arasan NAND controller spec the flash clock or the NAND bus clock(i.e., nfc->bus_clk), need to be updated instead. This patch keeps the system clock unchanged and updates the NAND bus clock as per the timing modes. Fixes: 197b88fecc50 ("mtd: rawnand: arasan: Add new Arasan NAND controller") Signed-off-by: Amit Kumar Mahapatra --- drivers/mtd/nand/raw/arasan-nand-controller.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/na= nd/raw/arasan-nand-controller.c index 53bd10738418..4f6da82dd2b1 100644 --- a/drivers/mtd/nand/raw/arasan-nand-controller.c +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c @@ -968,6 +968,7 @@ static int anfc_setup_interface(struct nand_chip *chip,= int target, const struct nand_sdr_timings *sdr; const struct nand_nvddr_timings *nvddr; unsigned int tccs_min, dqs_mode, fast_tcad; + int ret; =20 if (nand_interface_is_nvddr(conf)) { nvddr =3D nand_get_nvddr_timings(conf); @@ -1043,7 +1044,11 @@ static int anfc_setup_interface(struct nand_chip *ch= ip, int target, DQS_BUFF_SEL_OUT(dqs_mode); } =20 - anand->clk =3D ANFC_XLNX_SDR_DFLT_CORE_CLK; + ret =3D clk_set_rate(nfc->bus_clk, ANFC_XLNX_SDR_DFLT_CORE_CLK); + if (ret) { + dev_err(nfc->dev, "Failed to change bus clock rate\n"); + return ret; + } =20 /* * Due to a hardware bug in the ZynqMP SoC, SDR timing modes 0-1 work @@ -1052,8 +1057,13 @@ static int anfc_setup_interface(struct nand_chip *ch= ip, int target, * 80MHz when using SDR modes 2-5 with this SoC. */ if (of_device_is_compatible(np, "xlnx,zynqmp-nand-controller") && - nand_interface_is_sdr(conf) && conf->timings.mode >=3D 2) - anand->clk =3D ANFC_XLNX_SDR_HS_CORE_CLK; + nand_interface_is_sdr(conf) && conf->timings.mode >=3D 2) { + ret =3D clk_set_rate(nfc->bus_clk, ANFC_XLNX_SDR_HS_CORE_CLK); + if (ret) { + dev_err(nfc->dev, "Failed to change bus clock rate\n"); + return ret; + } + } =20 return 0; } --=20 2.17.1 From nobody Sun Apr 26 08:21:20 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 825E2CCA482 for ; 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Tue, 21 Jun 2022 01:55:11 -0700 Envelope-to: miquel.raynal@bootlin.com, vigneshr@ti.com, git@amd.com, boris.brezillon@collabora.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, amit.kumar-mahapatra@amd.com, akumarma@amd.com, okitain@gmail.com Received: from [10.140.6.18] (port=52928 helo=xhdlakshmis40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1o3ZfD-0001C6-6I; Tue, 21 Jun 2022 01:55:11 -0700 From: Amit Kumar Mahapatra To: , CC: , , , , , , Olga Kitaina , Amit Kumar Mahapatra Subject: [PATCH v2 2/2] mtd: rawnand: arasan: Fix clock rate in NV-DDR Date: Tue, 21 Jun 2022 14:25:00 +0530 Message-ID: <20220621085500.1005-3-amit.kumar-mahapatra@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220621085500.1005-1-amit.kumar-mahapatra@xilinx.com> References: <20220621085500.1005-1-amit.kumar-mahapatra@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3c78179e-796c-4f11-8858-08da5363c06b X-MS-TrafficTypeDiagnostic: MN2PR02MB6352:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jun 2022 08:55:12.0549 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3c78179e-796c-4f11-8858-08da5363c06b X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: DM3NAM02FT057.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR02MB6352 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Olga Kitaina According to the Arasan NAND controller spec, the flash clock rate for SDR must be <=3D 100 MHz, while for NV-DDR it must be the same as the rate of t= he CLK line for the mode. The driver previously always set 100 MHz for NV-DDR, which would result in incorrect behavior for NV-DDR modes 0-4. The appropriate clock rate can be calculated from the NV-DDR timing parameters as 1/tCK, or for rates measured in picoseconds, 10^12 / nand_nvddr_timings->tCK_min. Signed-off-by: Olga Kitaina Signed-off-by: Amit Kumar Mahapatra --- drivers/mtd/nand/raw/arasan-nand-controller.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/na= nd/raw/arasan-nand-controller.c index 4f6da82dd2b1..0eff069d7f80 100644 --- a/drivers/mtd/nand/raw/arasan-nand-controller.c +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c @@ -1044,10 +1044,20 @@ static int anfc_setup_interface(struct nand_chip *c= hip, int target, DQS_BUFF_SEL_OUT(dqs_mode); } =20 - ret =3D clk_set_rate(nfc->bus_clk, ANFC_XLNX_SDR_DFLT_CORE_CLK); - if (ret) { - dev_err(nfc->dev, "Failed to change bus clock rate\n"); - return ret; + if (nand_interface_is_sdr(conf)) { + ret =3D clk_set_rate(nfc->bus_clk, ANFC_XLNX_SDR_DFLT_CORE_CLK); + if (ret) { + dev_err(nfc->dev, "Failed to change bus clock rate\n"); + return ret; + } + } else { + /* ONFI timings are defined in picoseconds */ + ret =3D clk_set_rate(nfc->bus_clk, div_u64((u64)NSEC_PER_SEC * 1000, + conf->timings.nvddr.tCK_min)); + if (ret) { + dev_err(nfc->dev, "Failed to change bus clock rate\n"); + return ret; + } } =20 /* --=20 2.17.1