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Mon, 17 May 2021 09:29:29 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E4D53100034; Mon, 17 May 2021 09:29:26 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id B4B34214D36; Mon, 17 May 2021 09:29:26 +0200 (CEST) Received: from lmecxl0573.lme.st.com (10.75.127.47) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 17 May 2021 09:29:25 +0200 Subject: Re: [PATCH v2 1/3] spi: spi-mem: add automatic poll status functions To: Boris Brezillon CC: Mark Brown , Miquel Raynal , Vignesh Raghavendra , , Alexandre Torgue , , , , , References: <20210507131756.17028-1-patrice.chotard@foss.st.com> <20210507131756.17028-2-patrice.chotard@foss.st.com> <20210508095506.4d0d628a@collabora.com> <542000b4-1a65-5090-72f9-441c75ee1098@foss.st.com> <20210510112249.5613978e@collabora.com> From: Patrice CHOTARD Message-ID: <48d8774c-9868-27e5-b8b0-fdbf99c84ba2@foss.st.com> Date: Mon, 17 May 2021 09:29:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210510112249.5613978e@collabora.com> Content-Language: en-US X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE1.st.com (10.75.127.1) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-05-17_01:2021-05-12, 2021-05-17 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210517_002940_967924_6DA6CE29 X-CRM114-Status: GOOD ( 20.88 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Hi Boris On 5/10/21 11:22 AM, Boris Brezillon wrote: > On Mon, 10 May 2021 10:46:48 +0200 > Patrice CHOTARD wrote: > >>> >>>> + >>>> + if (ctlr->mem_ops && ctlr->mem_ops->poll_status) { >>>> + ret = spi_mem_access_start(mem); >>>> + if (ret) >>>> + return ret; >>>> + >>>> + reinit_completion(&ctlr->xfer_completion); >>>> + >>>> + ret = ctlr->mem_ops->poll_status(mem, op, mask, match, >>>> + timeout_ms); >>>> + >>>> + ms = wait_for_completion_timeout(&ctlr->xfer_completion, >>>> + msecs_to_jiffies(timeout_ms)); >>> >>> Why do you need to wait here? I'd expect the poll_status to take care >>> of this wait. >> >> It was a request from Mark Brown [1]. The idea is to implement >> similar mechanism already used in SPI framework. > > Well, you have to choose, either you pass a timeout to ->poll_status() > and let the driver wait for the status change (and return -ETIMEDOUT if > it didn't happen in time), or you do it here and the driver only has to > signal the core completion object. I think it's preferable to let the > driver handle the timeout though, because you don't know how the > status check will be implemented, and it's not like the > reinit_completion()+wait_for_completion_timeout() done here would > greatly simplify the drivers wait logic anyway. > Ok i will remove the reinit/wait_completion() as you suggested. Thanks Patrice ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/