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[209.132.180.67]) by mx.google.com with ESMTP id b30si3205541eda.200.2019.10.10.02.01.08; Thu, 10 Oct 2019 02:01:32 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=SBpkl6di; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388044AbfJJIpI (ORCPT + 99 others); Thu, 10 Oct 2019 04:45:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:50508 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388345AbfJJIpA (ORCPT ); Thu, 10 Oct 2019 04:45:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 C03F521929; Thu, 10 Oct 2019 08:44:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570697100; bh=nVfH0Y+P0S0auPKi3sefQmgsK6Oeq7PNhJqG1QzuM5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SBpkl6diVaw+4HzysQYXHB8ibLd9DfxM93O++nYBs8HDFPU893PMOvPl0jTaGcse6 PQxH53CY+YFuXMnhXYDe57u4IFdbDML6a05E3gcMtLP7FO0gWRA4ctAChi0OHSly1o 11aeFmh8Z9l15mJ9VpREnULlXuRuIobPDDe0CQWQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sean Nyekjaer , Marc Kleine-Budde Subject: [PATCH 4.19 019/114] can: mcp251x: mcp251x_hw_reset(): allow more time after a reset Date: Thu, 10 Oct 2019 10:35:26 +0200 Message-Id: <20191010083553.031818149@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191010083544.711104709@linuxfoundation.org> References: <20191010083544.711104709@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marc Kleine-Budde commit d84ea2123f8d27144e3f4d58cd88c9c6ddc799de upstream. Some boards take longer than 5ms to power up after a reset, so allow some retries attempts before giving up. Fixes: ff06d611a31c ("can: mcp251x: Improve mcp251x_hw_reset()") Cc: linux-stable Tested-by: Sean Nyekjaer Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/spi/mcp251x.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) --- a/drivers/net/can/spi/mcp251x.c +++ b/drivers/net/can/spi/mcp251x.c @@ -626,7 +626,7 @@ static int mcp251x_setup(struct net_devi static int mcp251x_hw_reset(struct spi_device *spi) { struct mcp251x_priv *priv = spi_get_drvdata(spi); - u8 reg; + unsigned long timeout; int ret; /* Wait for oscillator startup timer after power up */ @@ -640,10 +640,19 @@ static int mcp251x_hw_reset(struct spi_d /* Wait for oscillator startup timer after reset */ mdelay(MCP251X_OST_DELAY_MS); - reg = mcp251x_read_reg(spi, CANSTAT); - if ((reg & CANCTRL_REQOP_MASK) != CANCTRL_REQOP_CONF) - return -ENODEV; - + /* Wait for reset to finish */ + timeout = jiffies + HZ; + while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) != + CANCTRL_REQOP_CONF) { + usleep_range(MCP251X_OST_DELAY_MS * 1000, + MCP251X_OST_DELAY_MS * 1000 * 2); + + if (time_after(jiffies, timeout)) { + dev_err(&spi->dev, + "MCP251x didn't enter in conf mode after reset\n"); + return -EBUSY; + } + } return 0; }