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Mon, 12 May 2025 23:36:39 -0700 (PDT) From: Troy Mitchell Date: Tue, 13 May 2025 14:36:13 +0800 Subject: [PATCH v3 1/2] i2c: imx: use guard to take spinlock Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250513-i2c-imx-update-v3-1-817b7426a67e@gmail.com> References: <20250513-i2c-imx-update-v3-0-817b7426a67e@gmail.com> In-Reply-To: <20250513-i2c-imx-update-v3-0-817b7426a67e@gmail.com> To: Oleksij Rempel , Pengutronix Kernel Team , Andi Shyti , Shawn Guo , Sascha Hauer , Fabio Estevam Cc: linux-i2c@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Troy Mitchell , Yongchao Jia , Frank Li X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1747118187; l=3101; i=troymitchell988@gmail.com; h=from:subject:message-id; bh=h+IkIgCUvVv5X/EgaxFnbE68t9F1Ebt3Kltz7OM6R0o=; b=GEBTx6+w7HdlyIV2HGzJrrowsb4WUjf9YUDMcusHX61zNyz4tZoMS2uN2u12UPh1FXB5/cVSC QhMiNEnbqgnAxvnM70de3VHUi8VKsRvt/VNeqwQ9jVbxs9ve176vtez X-Developer-Key: i=troymitchell988@gmail.com; a=ed25519; pk=2spEMGBd/Wkpd36N1aD9KFWOk0aHrhVxZQt+jxLXVC0= Use guard to automatically release the lock after going out of scope instead of calling it manually. i2c_imx_slave_handle() can safely be entered with the lock held. Refactored the i2c_imx_isr function so that i2c_imx_master_isr does not participate in the guard scope So Using scoped_guard simplifies the control flow by ensuring consistent and automatic unlock, which improves readability without affecting correctness. Co-developed-by: Yongchao Jia Signed-off-by: Yongchao Jia Reviewed-by: Frank Li Signed-off-by: Troy Mitchell --- drivers/i2c/busses/i2c-imx.c | 37 ++++++++++++++++--------------------- 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 9e5d454d8318..5b276e007292 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -891,13 +892,13 @@ static enum hrtimer_restart i2c_imx_slave_timeout(struct hrtimer *t) struct imx_i2c_struct *i2c_imx = container_of(t, struct imx_i2c_struct, slave_timer); unsigned int ctl, status; - unsigned long flags; - spin_lock_irqsave(&i2c_imx->slave_lock, flags); + guard(spinlock_irqsave)(&i2c_imx->slave_lock); + status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); i2c_imx_slave_handle(i2c_imx, status, ctl); - spin_unlock_irqrestore(&i2c_imx->slave_lock, flags); + return HRTIMER_NORESTART; } @@ -1125,32 +1126,26 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) { struct imx_i2c_struct *i2c_imx = dev_id; unsigned int ctl, status; - unsigned long flags; - spin_lock_irqsave(&i2c_imx->slave_lock, flags); - status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); - ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); + scoped_guard(spinlock_irqsave, &i2c_imx->slave_lock) { + status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); + ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); + + if (!(status & I2SR_IIF)) + return IRQ_NONE; - if (status & I2SR_IIF) { i2c_imx_clear_irq(i2c_imx, I2SR_IIF); + if (i2c_imx->slave) { - if (!(ctl & I2CR_MSTA)) { - irqreturn_t ret; - - ret = i2c_imx_slave_handle(i2c_imx, - status, ctl); - spin_unlock_irqrestore(&i2c_imx->slave_lock, - flags); - return ret; - } + if (!(ctl & I2CR_MSTA)) + return i2c_imx_slave_handle(i2c_imx, + status, ctl); + i2c_imx_slave_finish_op(i2c_imx); } - spin_unlock_irqrestore(&i2c_imx->slave_lock, flags); - return i2c_imx_master_isr(i2c_imx, status); 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Mon, 12 May 2025 23:36:44 -0700 (PDT) Received: from [127.0.1.1] ([91.124.30.36]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b234a0b76ccsm6657936a12.27.2025.05.12.23.36.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 May 2025 23:36:44 -0700 (PDT) From: Troy Mitchell Date: Tue, 13 May 2025 14:36:14 +0800 Subject: [PATCH v3 2/2] i2c: imx: drop master prefix Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250513-i2c-imx-update-v3-2-817b7426a67e@gmail.com> References: <20250513-i2c-imx-update-v3-0-817b7426a67e@gmail.com> In-Reply-To: <20250513-i2c-imx-update-v3-0-817b7426a67e@gmail.com> To: Oleksij Rempel , Pengutronix Kernel Team , Andi Shyti , Shawn Guo , Sascha Hauer , Fabio Estevam Cc: linux-i2c@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Troy Mitchell , Yongchao Jia , Ahmad Fatoum X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1747118187; l=873; i=troymitchell988@gmail.com; h=from:subject:message-id; bh=Ip3fCjtKHIWdXoxS2ayjmqQZ2CXz2QC9JgKDfWc8a7w=; b=dtZzgsLgDl4KFfOlioaf2TlzkSvJK7YIv+UGk86oqaYvH+1y/9yehAeMD3OYYPYJjYj4B7deQ sLWQG6khLQIDMDqVZzcC3TMjq2ndve+vwEALeKmMzhawudTm3ezOiut X-Developer-Key: i=troymitchell988@gmail.com; a=ed25519; pk=2spEMGBd/Wkpd36N1aD9KFWOk0aHrhVxZQt+jxLXVC0= In light of the recent updates to the i2c subsystem, drop master prefix. Reviewed-by: Ahmad Fatoum Signed-off-by: Troy Mitchell --- drivers/i2c/busses/i2c-imx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 5b276e007292..d85adfb73bac 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -1687,8 +1687,8 @@ static u32 i2c_imx_func(struct i2c_adapter *adapter) } static const struct i2c_algorithm i2c_imx_algo = { - .master_xfer = i2c_imx_xfer, - .master_xfer_atomic = i2c_imx_xfer_atomic, + .xfer = i2c_imx_xfer, + .xfer_atomic = i2c_imx_xfer_atomic, .functionality = i2c_imx_func, .reg_slave = i2c_imx_reg_slave, .unreg_slave = i2c_imx_unreg_slave,