Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752332AbaGKCIo (ORCPT ); Thu, 10 Jul 2014 22:08:44 -0400 Received: from regular1.263xmail.com ([211.150.99.130]:38783 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751771AbaGKCIm (ORCPT ); Thu, 10 Jul 2014 22:08:42 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ABS-CHECKED: 4 X-KSVirus-check: 0 X-RL-SENDER: addy.ke@rock-chips.com X-FST-TO: broonie@kernel.org X-SENDER-IP: 127.0.0.1 X-LOGIN-NAME: addy.ke@rock-chips.com X-UNIQUE-TAG: <6569b6fbde62c4260e32dad36a98b8fd> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 1 From: Addy Ke To: broonie@kernel.org, heiko@sntech.de, grant.likely@linaro.org, robh+dt@kernel.org Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, jogo@openwrt.org, olof@lixom.net, hj@rock-chips.com, kever.yang@rock-chips.com, xjq@rock-chips.com, huangtao@rock-chips.com, zyw@rock-chips.com, yzq@rock-chips.com, zhenfu.fang@rock-chips.com, cf@rock-chips.com, zhangqing@rock-chips.com, hl@rock-chips.com, wei.luo@rock-chips.com, Addy Ke Subject: [PATCH 2/4] spi/rockchip: call wait_for_idle() for the transfer to complete Date: Fri, 11 Jul 2014 10:08:24 +0800 Message-Id: <1405044504-6917-1-git-send-email-addy.ke@rock-chips.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1405044389-6800-1-git-send-email-addy.ke@rock-chips.com> References: <1405044389-6800-1-git-send-email-addy.ke@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Addy Ke Suggested-by: Mark Brown Signed-off-by: Addy Ke --- drivers/spi/spi-rockchip.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 8c24708..09c690c 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -214,6 +214,18 @@ static inline void flush_fifo(struct rockchip_spi *rs) readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR); } +static inline void wait_for_idle(struct rockchip_spi *rs) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(5); + + do { + if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)) + return; + } while (time_before(jiffies, timeout)); + + dev_warn(rs->dev, "spi controller is in busy state!\n"); +} + static u32 get_fifo_len(struct rockchip_spi *rs) { u32 fifo; @@ -371,6 +383,10 @@ static int rockchip_spi_pio_transfer(struct rockchip_spi *rs) cpu_relax(); } while (remain); + /* If tx, wait until the FIFO data completely. */ + if (rs->tx) + wait_for_idle(rs); + return 0; } @@ -393,6 +409,9 @@ static void rockchip_spi_dma_txcb(void *data) unsigned long flags; struct rockchip_spi *rs = data; + /* Wait until the FIFO data completely. */ + wait_for_idle(rs); + spin_lock_irqsave(&rs->lock, flags); rs->state &= ~TXBUSY; @@ -536,11 +555,6 @@ static int rockchip_spi_transfer_one( rs->tx_sg = xfer->tx_sg; rs->rx_sg = xfer->rx_sg; - /* Delay until the FIFO data completely */ - if (xfer->tx_buf) - xfer->delay_usecs - = rs->fifo_len * rs->bpw * 1000000 / rs->speed; - if (rs->tx && rs->rx) rs->tmode = CR0_XFM_TR; else if (rs->tx) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/