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Sun, 11 Oct 2020 07:09:55 -0700 (PDT) Date: Sun, 11 Oct 2020 19:39:48 +0530 From: Manivannan Sadhasivam To: Cristian Ciocaltea Cc: Andreas =?iso-8859-1?Q?F=E4rber?= , Wolfram Sang , Peter Rosin , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-actions@lists.infradead.org Subject: Re: [PATCH 1/3] i2c: owl: Clear NACK and BUS error bits Message-ID: <20201011140948.GC4971@Mani-XPS-13-9360> References: <6ee573f2904c001ab07e30b386815257c05f6308.1602190168.git.cristian.ciocaltea@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6ee573f2904c001ab07e30b386815257c05f6308.1602190168.git.cristian.ciocaltea@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 09, 2020 at 12:44:39AM +0300, Cristian Ciocaltea wrote: > When the NACK and BUS error bits are set by the hardware, the driver is > responsible for clearing them by writing "1" into the corresponding > status registers. > > Hence perform the necessary operations in owl_i2c_interrupt(). > > Fixes: d211e62af466 ("i2c: Add Actions Semiconductor Owl family S900 I2C driver") > Reported-by: Manivannan Sadhasivam > Signed-off-by: Cristian Ciocaltea Reviewed-by: Manivannan Sadhasivam Thanks, Mani > --- > drivers/i2c/busses/i2c-owl.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/i2c/busses/i2c-owl.c b/drivers/i2c/busses/i2c-owl.c > index 672f1f239bd6..a163b8f308c1 100644 > --- a/drivers/i2c/busses/i2c-owl.c > +++ b/drivers/i2c/busses/i2c-owl.c > @@ -176,6 +176,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev) > fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT); > if (fifostat & OWL_I2C_FIFOSTAT_RNB) { > i2c_dev->err = -ENXIO; > + /* Clear NACK error bit by writing "1" */ > + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOSTAT, > + OWL_I2C_FIFOSTAT_RNB, true); > goto stop; > } > > @@ -183,6 +186,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev) > stat = readl(i2c_dev->base + OWL_I2C_REG_STAT); > if (stat & OWL_I2C_STAT_BEB) { > i2c_dev->err = -EIO; > + /* Clear BUS error bit by writing "1" */ > + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT, > + OWL_I2C_STAT_BEB, true); > goto stop; > } > > -- > 2.28.0 >