From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41EB1C282D7 for ; Sat, 2 Feb 2019 13:23:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0C5A82086C for ; Sat, 2 Feb 2019 13:23:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="olz3CT1F"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="se9hoaNH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0C5A82086C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4KmStQlwXZz4iD8IGRIVPRm3XKU/ZFQoZaYdDocmPC8=; b=olz3CT1FbrFBzx e38iw5O9c9X9Lcfn62ArNJTpG6yws0Pi0Lb4E3/dzSqgQ7NkzCiqIIrr8Xls632C2s1NcxkfOD76x 2uGVUVVJHcddxkok2Uh1MOLdMyfp0noo6RZtJB2s2n/iU21IQxOfS0AvMnl5v4aA1KgXnJ8Gs6dPE 9dsR+Q8Rt7IEURCClDwddKyZhuboK89WgNxyBOv4nWQv6lKdjCrMFGr0n0mZWmU7wDb7LBCOQ35hD bXrHwrwokRKgAbNCn5KWpbAR6vqjzsdQm+1IFgpvKClUVWg/xvJstZjN/Fp22kW7Eoqj+LPu/UKfw D6XkW09m8FSH7mdoZtKw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gpvH0-0004Gr-2S; Sat, 02 Feb 2019 13:23:54 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gpvGw-0004GQ-V0; Sat, 02 Feb 2019 13:23:52 +0000 Received: from bbrezillon (91-160-177-164.subs.proxad.net [91.160.177.164]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 653382173B; Sat, 2 Feb 2019 13:23:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549113829; bh=YYuVGPM0JmRr/Umuc+MgJly7841AA9DjCf5V59+o7Ac=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=se9hoaNHQ2E7qpQ4RKfZDAbyUs+bv2e+UQx+UgS9jh14h0ym6ZBgDUwFLiBiv1BA4 6inOl6dlMW/yKZ6MNceWGJN0Rtga5JZNSbIGMuym3Fkz+J1icASXDPRygX7Fx1p92h EyZCeGIuz4tgZEb+E8nwKIwuEbYt9JdJzs6p2jNY= Date: Sat, 2 Feb 2019 14:23:37 +0100 From: Boris Brezillon To: Subject: Re: [PATCH v3 03/13] spi: atmel-quadspi: drop wrappers for iomem accesses Message-ID: <20190202142337.3c51947e@bbrezillon> In-Reply-To: <53c9f4b2-7022-e13d-65a4-2e1bed4d76b1@microchip.com> References: <20190202040653.1217-1-tudor.ambarus@microchip.com> <20190202040653.1217-4-tudor.ambarus@microchip.com> <20190202081111.0bbc4443@bbrezillon> <53c9f4b2-7022-e13d-65a4-2e1bed4d76b1@microchip.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190202_052351_031151_910FD308 X-CRM114-Status: GOOD ( 18.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, alexandre.belloni@bootlin.com, broonie@kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, Ludovic.Desroches@microchip.com, Cyrille.Pitchen@microchip.com, linux-mtd@lists.infradead.org, bugalski.piotr@gmail.com, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 2 Feb 2019 08:44:27 +0000 wrote: > On 02/02/2019 09:11 AM, Boris Brezillon wrote: > > On Sat, 2 Feb 2019 04:07:19 +0000 > > wrote: > > > >> From: Tudor Ambarus > >> > >> The wrappers hid that the accesses are relaxed. Drop them. > >> > >> Suggested-by: Boris Brezillon > >> Signed-off-by: Tudor Ambarus > >> --- > >> v3: no change > >> v2: new patch > >> > >> drivers/spi/atmel-quadspi.c | 47 +++++++++++++++++++-------------------------- > >> 1 file changed, 20 insertions(+), 27 deletions(-) > >> > >> diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c > >> index feeddcb25e1f..131374db0db4 100644 > >> --- a/drivers/spi/atmel-quadspi.c > >> +++ b/drivers/spi/atmel-quadspi.c > >> @@ -175,17 +175,6 @@ static const struct qspi_mode sama5d2_qspi_modes[] = { > >> { 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD }, > >> }; > >> > >> -/* Register access functions */ > >> -static inline u32 qspi_readl(struct atmel_qspi *aq, u32 reg) > >> -{ > >> - return readl_relaxed(aq->regs + reg); > >> -} > >> - > >> -static inline void qspi_writel(struct atmel_qspi *aq, u32 reg, u32 value) > >> -{ > >> - writel_relaxed(value, aq->regs + reg); > >> -} > >> - > >> static inline bool is_compatible(const struct spi_mem_op *op, > >> const struct qspi_mode *mode) > >> { > >> @@ -229,6 +218,7 @@ static bool atmel_qspi_supports_op(struct spi_mem *mem, > >> static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) > >> { > >> struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->master); > >> + void __iomem *base = aq->regs; > > > > Can we name this variable regs instead of base or even get rid of it > > and dereference aq->regs in the xxx_relaxed() calls (doesn't look like > > the lines would be over 80 chars even when doing that). With this > > addressed, you can add: > > > > Reviewed-by: Boris Brezillon > > I chose to introduce the "base" variable when I have at least 2 dereferences in > a function, as an optimization. In exec_op() for example, there are 6 > dereferences of aq->reqs. Why do you prefer keeping aq->regs? I tend to not add local variables unless they help improve readability or optimize things. In this case, I'd expect the compiler to be smart enough to detect that aq->reqs is used several times and store it in a register. When it comes to readability, I don't think it improve things, but that's probably a matter of taste. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel