From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Kleine-Budde Subject: [PATCH v8 1/8] can: c_can: Add timeout to c_can_hw_raminit_ti() Date: Fri, 14 Nov 2014 19:09:44 +0100 Message-ID: <1415988591-6032-2-git-send-email-mkl@pengutronix.de> References: <1415988591-6032-1-git-send-email-mkl@pengutronix.de> Return-path: In-Reply-To: <1415988591-6032-1-git-send-email-mkl@pengutronix.de> Sender: linux-can-owner@vger.kernel.org To: linux-can@vger.kernel.org Cc: wsa@the-dreams.de, linux-omap@vger.kernel.org, rogerq@ti.com, kernel@pengutronix.de, Marc Kleine-Budde List-Id: linux-omap@vger.kernel.org From: Roger Quadros TI's RAMINIT DONE mechanism is buggy on AM43xx SoC and may not always be set after the START bit is set. Although it seems to work fine even in that case. So add a timeout mechanism to c_can_hw_raminit_wait_ti(). Don't bail out in that failure case but just print an error message. Signed-off-by: Roger Quadros Signed-off-by: Marc Kleine-Budde --- drivers/net/can/c_can/c_can_platform.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index fb279d6ae484..106c203fc5eb 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -75,10 +75,19 @@ static void c_can_plat_write_reg_aligned_to_32bit(const struct c_can_priv *priv, static void c_can_hw_raminit_wait_ti(const struct c_can_priv *priv, u32 mask, u32 val) { + int timeout = 0; + /* We look only at the bits of our instance. */ val &= mask; - while ((readl(priv->raminit_ctrlreg) & mask) != val) + while ((readl(priv->raminit_ctrlreg) & mask) != val) { udelay(1); + timeout++; + + if (timeout == 1000) { + dev_err(&priv->dev->dev, "%s: time out\n", __func__); + break; + } + } } static void c_can_hw_raminit_ti(const struct c_can_priv *priv, bool enable) -- 2.1.1