From patchwork Wed Jul 22 08:37:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Lin X-Patchwork-Id: 11677757 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A19E514E3 for ; Wed, 22 Jul 2020 08:39:30 +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 79B84207DD for ; Wed, 22 Jul 2020 08:39:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="m2BOzmk1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 79B84207DD 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+patchwork-linux-arm=patchwork.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:References:In-Reply-To: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:List-Owner; bh=l8Snny51Wvt4JuviuD7NF8HM39iqhH5o4u6pe23+DZ8=; b=m2BOzmk185WVo7e5u6aX1tdWYu hzTKgJryxYok6CNLWuaPrPmQdWP+1RQk1/aHXSoYHdBw9TaaYUFHpshIvpTY9Uyuj0/588ZEqZ3pv 9zytlIGhWDCsCcNVAzell6dAd+tRC4NPpsdEjfCQ1DXU459Zvuk9gEbxoWmwD8PwEQT+V6U6Q6YAd qZ6FzMKg78EnFimyGr9f2/L8993deQ8GrTjkMYMWHsGaoJE2suVrCuA9R3dbJ8osLan4TR+rdIgyb hiz8mMC6wwpdQmMPOS1+xd3Ow0yqKihG7HCCOalbIEEiu+/lNc8cZuZDr62MIkJUEbYQxJJ6LEdaH 3KO99djg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyAGF-0003E7-3T; Wed, 22 Jul 2020 08:37:59 +0000 Received: from lucky1.263xmail.com ([211.157.147.130]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyAGA-0003Cz-KK; Wed, 22 Jul 2020 08:37:56 +0000 Received: from localhost (unknown [192.168.167.69]) by lucky1.263xmail.com (Postfix) with ESMTP id 50338CAA67; Wed, 22 Jul 2020 16:37:48 +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 P18496T139713711163136S1595407061138531_; Wed, 22 Jul 2020 16:37:47 +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 v2 3/3] spi: rockchip: Fix error in SPI slave pio read Date: Wed, 22 Jul 2020 16:37:37 +0800 Message-Id: <20200722083737.8820-3-jon.lin@rock-chips.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200722083737.8820-1-jon.lin@rock-chips.com> References: <20200722083737.8820-1-jon.lin@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200722_043754_916987_22711109 X-CRM114-Status: GOOD ( 12.08 ) X-Spam-Score: 1.5 (+) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (1.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [211.157.147.130 listed in list.dnswl.org] 1.5 RCVD_IN_SORBS_WEB RBL: SORBS: sender is an abusable web server [58.22.7.114 listed in dnsbl.sorbs.net] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [211.157.147.130 listed in wl.mailspike.net] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 T_SPF_PERMERROR SPF: test of record failed (permerror) 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: heiko@sntech.de, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-rockchip@lists.infradead.org, Jon Lin , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The RXFLR is possible larger than rx_left in Rockchip SPI, fix it. Signed-off-by: Jon Lin Reviewed-by: Heiko Stuebner --- drivers/spi/spi-rockchip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index a451dacab5cf..75a8a9428ff8 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -291,7 +291,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs) static void rockchip_spi_pio_reader(struct rockchip_spi *rs) { u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); - u32 rx_left = rs->rx_left - words; + u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0; /* the hardware doesn't allow us to change fifo threshold * level while spi is enabled, so instead make sure to leave