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=-10.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7C63BC433E3 for ; Thu, 23 Jul 2020 00:45:40 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 4CB04206D7 for ; Thu, 23 Jul 2020 00:45:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="zD2MRt6x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4CB04206D7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=rock-chips.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Owner; bh=H3IAsGykV4SHQmxyZyyfA3i3zQVTgcFm9ctEuTu77Mk=; b=zD2MRt6x6xDSwnhdiNM/ZOSAGy XMTdRTLm2eB/yDM7CDIs7xXJ4N0VD88cV1o+dUHIz3yjGuJUYL38g2AOJ4g6oeJWUNr7Ro9yhnsvD cPTjYIQLmqUumbToy1zG3nvUnKxOp4FQ0dsS9oMJrDagjfDfW28t2UuebXTUVH9g+SRki66IqbGjj k4do8ybkeKKoaQDhhyvNn5oeha3dIZw3d4DdiN4rRATmjIfrWu8//PSVGIcVh6aAbQHh+wIQYcwbj k8uNNCd7XyUDXMwsxkxPjhQx4d1M6UeiFA9nR71NrjdrIPpxgWxCXexoKidZFej7D1R89h9Hg6nMr znKIAh6Q==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyPLH-0005E8-V0; Thu, 23 Jul 2020 00:44:12 +0000 Received: from lucky1.263xmail.com ([211.157.147.133]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyPLC-0005C5-U2; Thu, 23 Jul 2020 00:44:08 +0000 Received: from localhost (unknown [192.168.167.209]) by lucky1.263xmail.com (Postfix) with ESMTP id E51F1C5AAA; Thu, 23 Jul 2020 08:44:00 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ADDR-CHECKED4: 1 X-ANTISPAM-LEVEL: 2 X-ABS-CHECKED: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P17009T140099499042560S1595465038112439_; Thu, 23 Jul 2020 08:44:00 +0800 (CST) X-IP-DOMAINF: 1 X-UNIQUE-TAG: X-RL-SENDER: jon.lin@rock-chips.com X-SENDER: jon.lin@rock-chips.com X-LOGIN-NAME: jon.lin@rock-chips.com X-FST-TO: broonie@kernel.org X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 X-System-Flag: 0 From: Jon Lin To: broonie@kernel.org Subject: [PATCH v3 1/3] spi: rockchip: Config spi rx dma burst size depend on xfer length Date: Thu, 23 Jul 2020 08:43:54 +0800 Message-Id: <20200723004356.6390-1-jon.lin@rock-chips.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200722_204407_292139_93F8C6CC X-CRM114-Status: GOOD ( 12.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel@esmil.dk, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-rockchip@lists.infradead.org, Jon Lin , linux-arm-kernel@lists.infradead.org, heiko@sntech.de MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The burst length can be adjusted according to the transmission length to improve the transmission rate Signed-off-by: Jon Lin Reviewed-by: Emil Renner Berthing Tested-by: Emil Renner Berthing --- drivers/spi/spi-rockchip.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 9b8a5e1233c0..63593a5b87fa 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -384,6 +384,19 @@ static void rockchip_spi_dma_txcb(void *data) spi_finalize_current_transfer(ctlr); } +static u32 rockchip_spi_calc_burst_size(u32 data_len) +{ + u32 i; + + /* burst size: 1, 2, 4, 8 */ + for (i = 1; i < 8; i <<= 1) { + if (data_len & i) + break; + } + + return i; +} + static int rockchip_spi_prepare_dma(struct rockchip_spi *rs, struct spi_controller *ctlr, struct spi_transfer *xfer) { @@ -397,7 +410,8 @@ static int rockchip_spi_prepare_dma(struct rockchip_spi *rs, .direction = DMA_DEV_TO_MEM, .src_addr = rs->dma_addr_rx, .src_addr_width = rs->n_bytes, - .src_maxburst = 1, + .src_maxburst = rockchip_spi_calc_burst_size(xfer->len / + rs->n_bytes), }; dmaengine_slave_config(ctlr->dma_rx, &rxconf); @@ -525,7 +539,8 @@ static void rockchip_spi_config(struct rockchip_spi *rs, writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); writel_relaxed(rs->fifo_len / 2, rs->regs + ROCKCHIP_SPI_DMATDLR); - writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR); + writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1, + rs->regs + ROCKCHIP_SPI_DMARDLR); writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR); /* the hardware only supports an even clock divisor, so -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel