From: Oleksij Rempel <o.rempel@pengutronix.de> To: Christian Eggers <ceggers@arri.de> Cc: "Oleksij Rempel" <linux@rempel-privat.de>, "Shawn Guo" <shawnguo@kernel.org>, "Sascha Hauer" <s.hauer@pengutronix.de>, "Fabio Estevam" <festevam@gmail.com>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>, "David Laight" <David.Laight@ACULAB.COM>, linux-kernel@vger.kernel.org, "Krzysztof Kozlowski" <krzk@kernel.org>, "NXP Linux Team" <linux-imx@nxp.com>, "Pengutronix Kernel Team" <kernel@pengutronix.de>, stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Subject: Re: [PATCH v5 1/3] i2c: imx: Fix reset of I2SR_IAL flag Date: Fri, 9 Oct 2020 09:11:32 +0200 [thread overview] Message-ID: <20201009071132.GA817@pengutronix.de> (raw) In-Reply-To: <20201007084524.10835-2-ceggers@arri.de> Hi Christian, On Wed, Oct 07, 2020 at 10:45:22AM +0200, Christian Eggers wrote: > According to the "VFxxx Controller Reference Manual" (and the comment > block starting at line 97), Vybrid requires writing a one for clearing > an interrupt flag. Syncing the method for clearing I2SR_IIF in > i2c_imx_isr(). > > Signed-off-by: Christian Eggers <ceggers@arri.de> > Fixes: 4b775022f6fd ("i2c: imx: add struct to hold more configurable quirks") > Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > Cc: stable@vger.kernel.org > --- > drivers/i2c/busses/i2c-imx.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c > index 0ab5381aa012..cbdcab73a055 100644 > --- a/drivers/i2c/busses/i2c-imx.c > +++ b/drivers/i2c/busses/i2c-imx.c > @@ -412,6 +412,19 @@ static void i2c_imx_dma_free(struct imx_i2c_struct *i2c_imx) > dma->chan_using = NULL; > } > > +static void i2c_imx_clear_irq(struct imx_i2c_struct *i2c_imx, unsigned int bits) > +{ > + unsigned int temp; > + > + /* > + * i2sr_clr_opcode is the value to clear all interrupts. Here we want to > + * clear only <bits>, so we write ~i2sr_clr_opcode with just <bits> > + * toggled. This is required because i.MX needs W1C and Vybrid uses W0C. > + */ This comment need correction. The i.MX needs W0C and Vybrid uses W1C > + temp = ~i2c_imx->hwdata->i2sr_clr_opcode ^ bits; > + imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > +} > + > static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool atomic) > { > unsigned long orig_jiffies = jiffies; > @@ -424,8 +437,7 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool a > > /* check for arbitration lost */ > if (temp & I2SR_IAL) { > - temp &= ~I2SR_IAL; > - imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > + i2c_imx_clear_irq(i2c_imx, I2SR_IAL); > return -EAGAIN; > } > > @@ -623,9 +635,7 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) > if (temp & I2SR_IIF) { > /* save status register */ > i2c_imx->i2csr = temp; > - temp &= ~I2SR_IIF; > - temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); > - imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > + i2c_imx_clear_irq(i2c_imx, I2SR_IIF); > wake_up(&i2c_imx->queue); > return IRQ_HANDLED; > } > -- Otherwise Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
WARNING: multiple messages have this Message-ID (diff)
From: Oleksij Rempel <o.rempel@pengutronix.de> To: Christian Eggers <ceggers@arri.de> Cc: "Shawn Guo" <shawnguo@kernel.org>, "Sascha Hauer" <s.hauer@pengutronix.de>, linux-kernel@vger.kernel.org, "Krzysztof Kozlowski" <krzk@kernel.org>, "Oleksij Rempel" <linux@rempel-privat.de>, "David Laight" <David.Laight@ACULAB.COM>, "NXP Linux Team" <linux-imx@nxp.com>, "Pengutronix Kernel Team" <kernel@pengutronix.de>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>, stable@vger.kernel.org, "Fabio Estevam" <festevam@gmail.com>, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Subject: Re: [PATCH v5 1/3] i2c: imx: Fix reset of I2SR_IAL flag Date: Fri, 9 Oct 2020 09:11:32 +0200 [thread overview] Message-ID: <20201009071132.GA817@pengutronix.de> (raw) In-Reply-To: <20201007084524.10835-2-ceggers@arri.de> Hi Christian, On Wed, Oct 07, 2020 at 10:45:22AM +0200, Christian Eggers wrote: > According to the "VFxxx Controller Reference Manual" (and the comment > block starting at line 97), Vybrid requires writing a one for clearing > an interrupt flag. Syncing the method for clearing I2SR_IIF in > i2c_imx_isr(). > > Signed-off-by: Christian Eggers <ceggers@arri.de> > Fixes: 4b775022f6fd ("i2c: imx: add struct to hold more configurable quirks") > Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > Cc: stable@vger.kernel.org > --- > drivers/i2c/busses/i2c-imx.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c > index 0ab5381aa012..cbdcab73a055 100644 > --- a/drivers/i2c/busses/i2c-imx.c > +++ b/drivers/i2c/busses/i2c-imx.c > @@ -412,6 +412,19 @@ static void i2c_imx_dma_free(struct imx_i2c_struct *i2c_imx) > dma->chan_using = NULL; > } > > +static void i2c_imx_clear_irq(struct imx_i2c_struct *i2c_imx, unsigned int bits) > +{ > + unsigned int temp; > + > + /* > + * i2sr_clr_opcode is the value to clear all interrupts. Here we want to > + * clear only <bits>, so we write ~i2sr_clr_opcode with just <bits> > + * toggled. This is required because i.MX needs W1C and Vybrid uses W0C. > + */ This comment need correction. The i.MX needs W0C and Vybrid uses W1C > + temp = ~i2c_imx->hwdata->i2sr_clr_opcode ^ bits; > + imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > +} > + > static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool atomic) > { > unsigned long orig_jiffies = jiffies; > @@ -424,8 +437,7 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool a > > /* check for arbitration lost */ > if (temp & I2SR_IAL) { > - temp &= ~I2SR_IAL; > - imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > + i2c_imx_clear_irq(i2c_imx, I2SR_IAL); > return -EAGAIN; > } > > @@ -623,9 +635,7 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) > if (temp & I2SR_IIF) { > /* save status register */ > i2c_imx->i2csr = temp; > - temp &= ~I2SR_IIF; > - temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); > - imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); > + i2c_imx_clear_irq(i2c_imx, I2SR_IIF); > wake_up(&i2c_imx->queue); > return IRQ_HANDLED; > } > -- Otherwise Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-10-09 7:11 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-07 8:45 [PATCH v5 0/3] i2c: imx: Fix handling of arbitration loss Christian Eggers 2020-10-07 8:45 ` Christian Eggers 2020-10-07 8:45 ` [PATCH v5 1/3] i2c: imx: Fix reset of I2SR_IAL flag Christian Eggers 2020-10-07 8:45 ` Christian Eggers 2020-10-08 9:56 ` Wolfram Sang 2020-10-08 9:56 ` Wolfram Sang 2020-10-09 7:11 ` Oleksij Rempel [this message] 2020-10-09 7:11 ` Oleksij Rempel 2020-10-09 7:52 ` Oleksij Rempel 2020-10-09 7:52 ` Oleksij Rempel 2020-10-07 8:45 ` [PATCH v5 2/3] i2c: imx: Check for I2SR_IAL after every byte Christian Eggers 2020-10-07 8:45 ` Christian Eggers 2020-10-09 7:53 ` Oleksij Rempel 2020-10-09 7:53 ` Oleksij Rempel 2020-10-07 8:45 ` [PATCH v5 3/3] i2c: imx: Don't generate STOP condition if arbitration has been lost Christian Eggers 2020-10-07 8:45 ` Christian Eggers 2020-10-09 8:14 ` Oleksij Rempel 2020-10-09 8:14 ` Oleksij Rempel
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