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From: Alyssa Rosenzweig To: sven@svenpeter.dev Cc: Janne Grunau , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Andi Shyti , Neal Gompa , Hector Martin , linuxppc-dev@lists.ozlabs.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 3/6] i2c: pasemi: Improve timeout handling Message-ID: References: <20250415-pasemi-fixes-v2-0-c543bf53151a@svenpeter.dev> <20250415-pasemi-fixes-v2-3-c543bf53151a@svenpeter.dev> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250415-pasemi-fixes-v2-3-c543bf53151a@svenpeter.dev> X-Migadu-Flow: FLOW_OUT Reviewed-by: Alyssa Rosenzweig Le Tue , Apr 15, 2025 at 03:36:57PM +0000, Sven Peter via B4 Relay a écrit : > From: Sven Peter > > Add proper timeout handling for the interrupt path. > Previously, this was only correctly done for the polling path. > Note that we drop reg_write(smbus, REG_SMSTA, status) here which > will be done anyway whenever the next transaction starts via > pasemi_smb_clear. > > Signed-off-by: Sven Peter > --- > drivers/i2c/busses/i2c-pasemi-core.c | 24 +++++++++++++++++------- > 1 file changed, 17 insertions(+), 7 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-pasemi-core.c b/drivers/i2c/busses/i2c-pasemi-core.c > index df1b0087dcacb0a3b94196368137d5e20b0e6d7e..9b611dbdfef23e78a4ea75ac0311938d52b6ba96 100644 > --- a/drivers/i2c/busses/i2c-pasemi-core.c > +++ b/drivers/i2c/busses/i2c-pasemi-core.c > @@ -91,32 +91,42 @@ static void pasemi_smb_clear(struct pasemi_smbus *smbus) > static int pasemi_smb_waitready(struct pasemi_smbus *smbus) > { > int timeout = 100; > + int ret; > unsigned int status; > > if (smbus->use_irq) { > reinit_completion(&smbus->irq_completion); > reg_write(smbus, REG_IMASK, SMSTA_XEN | SMSTA_MTN); > - wait_for_completion_timeout(&smbus->irq_completion, msecs_to_jiffies(100)); > + ret = wait_for_completion_timeout(&smbus->irq_completion, msecs_to_jiffies(100)); > reg_write(smbus, REG_IMASK, 0); > status = reg_read(smbus, REG_SMSTA); > + > + if (ret < 0) { > + dev_err(smbus->dev, > + "Completion wait failed with %d, status 0x%08x\n", > + ret, status); > + return ret; > + } else if (ret == 0) { > + dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); > + return -ETIME; > + } > } else { > status = reg_read(smbus, REG_SMSTA); > while (!(status & SMSTA_XEN) && timeout--) { > msleep(1); > status = reg_read(smbus, REG_SMSTA); > } > + > + if (timeout < 0) { > + dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); > + return -ETIME; > + } > } > > /* Got NACK? */ > if (status & SMSTA_MTN) > return -ENXIO; > > - if (timeout < 0) { > - dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); > - reg_write(smbus, REG_SMSTA, status); > - return -ETIME; > - } > - > /* Clear XEN */ > reg_write(smbus, REG_SMSTA, SMSTA_XEN); > > > -- > 2.34.1 > >