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Tue, 10 Jul 2018 03:11:46 +0000 Date: Tue, 10 Jul 2018 11:09:42 +0800 From: Jisheng Zhang To: Andy Shevchenko , Greg Kroah-Hartman , Jiri Slaby Cc: , , Subject: [PATCH v4 0/3] serial: 8250_dw: add fractional divisor support Message-ID: <20180710110942.5b0a016e@xhacker.debian> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Originating-IP: [124.74.246.114] X-ClientProxiedBy: PR0P264CA0036.FRAP264.PROD.OUTLOOK.COM (2603:10a6:100:1::24) To DM5PR03MB2635.namprd03.prod.outlook.com (2603:10b6:3:43::9) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: eeb42cc3-4eee-49c7-c9fd-08d5e612e2bc X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989117)(5600053)(711020)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(2017052603328)(7153060)(7193020);SRVR:DM5PR03MB2635; X-Microsoft-Exchange-Diagnostics: 1;DM5PR03MB2635;3:j8w7KZtgvgRKyzD2Ehemfwyj0XZaR+5Vb/4ukU46hFPJ0VzgsG4ujHWFwpJvvzXsW7Ay5CzAZ70kGywMTl6qW8SQBsdEqzAH6h1Cb/z3f+ThRAdAOp0Wi04cABdqeCiZgbl7BWuIdfERTGq9vwXQF3bfWdZfXfHbMnTbQXB9POsjopU8JvUMmcDbhtMRYV4wIziyaZoGGX0A6kBenmG3Dp3++MI40qYaLt4JIZXTDDl38E5WAbbSBpnPD3OEW0+I;25:RejEo9bfzu/wVnoaEBgueL5RW1bnw/YfGbxvk6qUEtVA3Pv1iVnw0thX3PZibwdzzq9vOkpJ8RCd+GNP6bseDGsC3CuCQ+xdhRM+Ju4iof2mg4j/6NulbTn5X2qZ6vAPT3w4akGBCHfmggFQjcSvHAsbmfMGxbbFtWnQHlKrc0g4e7uI6qinvIfLvBmQceCDcP8WlRXU+mdReoiRl6Hz7iSNKAQSDV9mkNcw0fNx9GYJSnhP6Bbh02ZrcvQ2hE0BiR7tY7/EIP0D4IiAzwk62rETQeRodT8O8lyXhKaCNyp9TiQI5oIb0VhD9Mj+1FwDWHrcc9r5IKKbBwyhpO/gUg==;31:YBJM8ryPxPAVUdM2wgMfTSKw1MVCwucLxkayo6Hcmo2V8zJlPVWAuNt1QOcry9fLO1630vFbpF+IL9MbfRk4gpmiS7xIRyu2u+f/iljN9CXy7E9HRsoFMa26AXW102WSfqTvU4AhbGiNJZ/C880Q82QvsE85GIg6UVHt369hlVKdxgS0IlEo4GiUmHH5Er2veP0Tt+kSc0udegfP4IZlNMR5+3QkbELA1ZuFjBCM8Tw= X-MS-TrafficTypeDiagnostic: DM5PR03MB2635: X-Microsoft-Exchange-Diagnostics: 1;DM5PR03MB2635;20: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;4:SPDrOGwJ5hynxFhoLXE1SLQsNwBO0tbyYpkm/edjxgA0nYBLQCtCHtytM2DM5aDZVQe8YAnhdu/T0B1N/QtXudqhXtajDQvgoK2ueI9z8sn9EKgImXPV9n4WRhScAI/FJp6f3SkzZuv8g9zVROI0ozIMQDI3Qe34seu8UI55XX/lBMCkgthQpSnokEtMPcPNgDGrbS1xzZkwUpFWPuHqh911YbKeHcq2PoQps0uzpJbCwZA0UB4qBUtPqZA+qn3XpkaDHWv5Aqt+ahGB34yRFA== X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; 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The fractional divisor width is 4bits ~ 6bits. patch1 introduces necessary hooks to 8250 core. patch2 exports serial8250_do_set_divisor() patch3 implements the fractional divisor support for Synopsys DW 8250. Since v3: - simplify the dw8250_get_divisor() implementation again. Since v2: - rebase to tty-next branch, since I need one patch from Andy which is in tty-next - drop the patch "serial: 8250: let serial8250_get_divisor() get uart_port * as param" since it's in tty-next now. - add a new patch to export serial8250_do_set_divisor(), and reuse it to complete dw8250_set_divisor(). - remove DW 8250 version check, since the DLF register always exists and if fractional divisor isn't supported, the register read as 0 - add comments to explain how dw8250_get_divisor() get quot and frac. - the frac calcuation is simplified with well implemented GENMASK - Add Andy's Reviewed-by tag to patch1. Since v1: - add an extra patch to let serial8250_get_divisor() get uart_port * as param - take Andy's suggestions to "integrates hooks in the same way like it's done for the rest of 8250 ones". Many thanks to Andy. Jisheng Zhang (3): serial: 8250: introduce get_divisor() and set_divisor() hook serial: 8250: export serial8250_do_set_divisor() serial: 8250_dw: add fractional divisor support drivers/tty/serial/8250/8250_core.c | 4 +++ drivers/tty/serial/8250/8250_dw.c | 45 +++++++++++++++++++++++++++++ drivers/tty/serial/8250/8250_port.c | 30 +++++++++++++++---- include/linux/serial_8250.h | 3 ++ include/linux/serial_core.h | 7 +++++ 5 files changed, 84 insertions(+), 5 deletions(-) -- 2.18.0