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Thu, 20 Jul 2023 18:41:35 +0300 (MSK) Received: from [192.168.1.146] (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Thu, 20 Jul 2023 18:41:35 +0300 Message-ID: <5dc58681-d89f-8a8d-4da5-ccfa142fa15a@sberdevices.ru> Date: Thu, 20 Jul 2023 18:41:11 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v2 2/2] spi: amlogic-spifc-a1: add support for max_speed_hz Content-Language: en-US To: Jerome Brunet , Mark Brown , Neil Armstrong , Andy Shevchenko CC: , , , References: <20230706110331.19794-1-mmkurbanov@sberdevices.ru> <20230706110331.19794-3-mmkurbanov@sberdevices.ru> <1jlefm6h8g.fsf@starbuckisacylon.baylibre.com> From: Martin Kurbanov In-Reply-To: <1jlefm6h8g.fsf@starbuckisacylon.baylibre.com> X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 178759 [Jul 20 2023] X-KSMG-AntiSpam-Version: 5.9.59.0 X-KSMG-AntiSpam-Envelope-From: MMKurbanov@sberdevices.ru X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 525 525 723604743bfbdb7e16728748c3fa45e9eba05f7d, {Tracking_arrow_text}, {Tracking_from_domain_doesnt_match_to}, 127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;sberdevices.ru:5.0.1,7.1.1;100.64.160.123:7.1.2;p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1, FromAlignment: s, {Tracking_white_helo}, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/07/20 13:53:00 #21647430 X-KSMG-AntiVirus-Status: Clean, skipped X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230720_084155_304021_38972B40 X-CRM114-Status: GOOD ( 12.72 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 11.07.2023 10:25, Jerome Brunet wrote: >> >> +static int amlogic_spifc_a1_set_freq(struct amlogic_spifc_a1 *spifc, u32 freq) >> +{ >> + int ret; >> + >> + if (freq == spifc->curr_speed_hz) >> + return 0; >> + >> + ret = clk_set_rate(spifc->clk, freq); >> + if (ret) >> + return ret; >> + >> + spifc->curr_speed_hz = freq; > > There is no guarantee that clk_set_rate() has set the rate you have > requested, at least not precisely. You should call clk_get_rate() here. > Hello Jerome, thank you for the feedback. Are you referring to a situation where there is a change in the rate due to a request from another client, such as a sibling driver with the same parent clock? -- Best Regards, Martin Kurbanov _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic