From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Raviteja Narayanam <raviteja.narayanam@xilinx.com>, Michal Simek <michal.simek@xilinx.com>, Wolfram Sang <wsa@kernel.org>, Sasha Levin <sashal@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 6/7] Revert "i2c: cadence: Fix the hold bit setting" Date: Mon, 27 Jul 2020 19:25:13 -0400 [thread overview] Message-ID: <20200727232514.718265-6-sashal@kernel.org> (raw) In-Reply-To: <20200727232514.718265-1-sashal@kernel.org> From: Raviteja Narayanam <raviteja.narayanam@xilinx.com> [ Upstream commit 0db9254d6b896b587759e2c844c277fb1a6da5b9 ] This reverts commit d358def706880defa4c9e87381c5bf086a97d5f9. There are two issues with "i2c: cadence: Fix the hold bit setting" commit. 1. In case of combined message request from user space, when the HOLD bit is cleared in cdns_i2c_mrecv function, a STOP condition is sent on the bus even before the last message is started. This is because when the HOLD bit is cleared, the FIFOS are empty and there is no pending transfer. The STOP condition should occur only after the last message is completed. 2. The code added by the commit is redundant. Driver is handling the setting/clearing of HOLD bit in right way before the commit. The setting of HOLD bit based on 'bus_hold_flag' is taken care in cdns_i2c_master_xfer function even before cdns_i2c_msend/cdns_i2c_recv functions. The clearing of HOLD bit is taken care at the end of cdns_i2c_msend and cdns_i2c_recv functions based on bus_hold_flag and byte count. Since clearing of HOLD bit is done after the slave address is written to the register (writing to address register triggers the message transfer), it is ensured that STOP condition occurs at the right time after completion of the pending transfer (last message). Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/i2c/busses/i2c-cadence.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c index 59c08d5b75d6a..45d6771fac8ce 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -382,10 +382,8 @@ static void cdns_i2c_mrecv(struct cdns_i2c *id) * Check for the message size against FIFO depth and set the * 'hold bus' bit if it is greater than FIFO depth. */ - if ((id->recv_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag) + if (id->recv_count > CDNS_I2C_FIFO_DEPTH) ctrl_reg |= CDNS_I2C_CR_HOLD; - else - ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD; cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET); @@ -442,11 +440,8 @@ static void cdns_i2c_msend(struct cdns_i2c *id) * Check for the message size against FIFO depth and set the * 'hold bus' bit if it is greater than FIFO depth. */ - if ((id->send_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag) + if (id->send_count > CDNS_I2C_FIFO_DEPTH) ctrl_reg |= CDNS_I2C_CR_HOLD; - else - ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD; - cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET); /* Clear the interrupts in interrupt status register. */ -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Raviteja Narayanam <raviteja.narayanam@xilinx.com>, Sasha Levin <sashal@kernel.org>, Michal Simek <michal.simek@xilinx.com>, Wolfram Sang <wsa@kernel.org>, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.9 6/7] Revert "i2c: cadence: Fix the hold bit setting" Date: Mon, 27 Jul 2020 19:25:13 -0400 [thread overview] Message-ID: <20200727232514.718265-6-sashal@kernel.org> (raw) In-Reply-To: <20200727232514.718265-1-sashal@kernel.org> From: Raviteja Narayanam <raviteja.narayanam@xilinx.com> [ Upstream commit 0db9254d6b896b587759e2c844c277fb1a6da5b9 ] This reverts commit d358def706880defa4c9e87381c5bf086a97d5f9. There are two issues with "i2c: cadence: Fix the hold bit setting" commit. 1. In case of combined message request from user space, when the HOLD bit is cleared in cdns_i2c_mrecv function, a STOP condition is sent on the bus even before the last message is started. This is because when the HOLD bit is cleared, the FIFOS are empty and there is no pending transfer. The STOP condition should occur only after the last message is completed. 2. The code added by the commit is redundant. Driver is handling the setting/clearing of HOLD bit in right way before the commit. The setting of HOLD bit based on 'bus_hold_flag' is taken care in cdns_i2c_master_xfer function even before cdns_i2c_msend/cdns_i2c_recv functions. The clearing of HOLD bit is taken care at the end of cdns_i2c_msend and cdns_i2c_recv functions based on bus_hold_flag and byte count. Since clearing of HOLD bit is done after the slave address is written to the register (writing to address register triggers the message transfer), it is ensured that STOP condition occurs at the right time after completion of the pending transfer (last message). Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/i2c/busses/i2c-cadence.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c index 59c08d5b75d6a..45d6771fac8ce 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -382,10 +382,8 @@ static void cdns_i2c_mrecv(struct cdns_i2c *id) * Check for the message size against FIFO depth and set the * 'hold bus' bit if it is greater than FIFO depth. */ - if ((id->recv_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag) + if (id->recv_count > CDNS_I2C_FIFO_DEPTH) ctrl_reg |= CDNS_I2C_CR_HOLD; - else - ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD; cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET); @@ -442,11 +440,8 @@ static void cdns_i2c_msend(struct cdns_i2c *id) * Check for the message size against FIFO depth and set the * 'hold bus' bit if it is greater than FIFO depth. */ - if ((id->send_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag) + if (id->send_count > CDNS_I2C_FIFO_DEPTH) ctrl_reg |= CDNS_I2C_CR_HOLD; - else - ctrl_reg = ctrl_reg & ~CDNS_I2C_CR_HOLD; - cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET); /* Clear the interrupts in interrupt status register. */ -- 2.25.1 _______________________________________________ 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:[~2020-07-27 23:25 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-27 23:25 [PATCH AUTOSEL 4.9 1/7] usb: hso: Fix debug compile warning on sparc32 Sasha Levin 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 2/7] qed: Disable "MFW indication via attention" SPAM every 5 minutes Sasha Levin 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 3/7] nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame Sasha Levin 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 4/7] parisc: add support for cmpxchg on u8 pointers Sasha Levin 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 5/7] net: ethernet: ravb: exit if re-initialization fails in tx timeout Sasha Levin 2020-07-27 23:25 ` Sasha Levin [this message] 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 6/7] Revert "i2c: cadence: Fix the hold bit setting" Sasha Levin 2020-07-27 23:25 ` [PATCH AUTOSEL 4.9 7/7] xen-netfront: fix potential deadlock in xennet_remove() Sasha Levin 2020-07-27 23:25 ` Sasha Levin
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