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Date: Fri, 7 Jun 2019 04:48:32 -0700
From: Bitan Biswas <bbiswas@...dia.com>
To: Dmitry Osipenko <digetx@...il.com>,
Laxman Dewangan <ldewangan@...dia.com>,
Thierry Reding <treding@...dia.com>,
Jonathan Hunter <jonathanh@...dia.com>,
<linux-i2c@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Shardar Mohammed <smohammed@...dia.com>,
Sowjanya Komatineni <skomatineni@...dia.com>,
Mantravadi Karthik <mkarthik@...dia.com>
Subject: Re: [PATCH V5] drivers: i2c: tegra: fix warning/check/error
On 6/6/19 11:05 PM, Dmitry Osipenko wrote:
> 07.06.2019 8:25, Bitan Biswas пишет:
>> Fix checkpatch.pl warning(s)/error(s)/check(s) in i2c-tegra.c
>>
>> Ignore checkpatch WARNING for 80 character line limit at
>> places where renaming fields compromises readability.
>>
>> Delay of approximately 1msec in flush i2c FIFO polling loop
>> achieved by usleep_range call as msleep can take 20msecs.
>>
>> Remove redundant BUG_ON calls or replace with WARN_ON_ONCE
>> as needed. Replace BUG() with error handling code.
>> Define I2C_ERR_UNEXPECTED_STATUS for error handling.
>>
>> Signed-off-by: Bitan Biswas <bbiswas@...dia.com>
>> ---
>> drivers/i2c/busses/i2c-tegra.c | 61 ++++++++++++++++++++++--------------------
>> 1 file changed, 32 insertions(+), 29 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
>> index 1dbba39..161eb28 100644
>> --- a/drivers/i2c/busses/i2c-tegra.c
>> +++ b/drivers/i2c/busses/i2c-tegra.c
>> @@ -67,17 +67,18 @@
>>
>> #define DVC_CTRL_REG1 0x000
>> #define DVC_CTRL_REG1_INTR_EN BIT(10)
>> -#define DVC_CTRL_REG2 0x004
>> -#define DVC_CTRL_REG3 0x008
>> +#define DVC_CTRL_REG2 BIT(2)
>> +#define DVC_CTRL_REG3 BIT(3)
>
> This is incorrect change, register address should be kept as a hex value
> because it is not a bitmask.
I shall remove the modification.
>
> I'd also recommend to just remove the DVC_CTRL_REG2 since it's not used
> anywhere in the code. You may also check all of other #defines and
> remove everything unused.
I shall remove the unused macro DVC_CTRL_REG2 and remove other unused
macros.
>
> You can also check all of variables for a need to be initialized, like
> for example "ret" doesn't need to be init'ed in tegra_i2c_xfer() and
> some other places. That will be a good clean up as well.
I shall clean up the instances I can make out along and remove the ret
initialization in tegra_i2c_xfer function.
>
>> #define DVC_CTRL_REG3_SW_PROG BIT(26)
>> #define DVC_CTRL_REG3_I2C_DONE_INTR_EN BIT(30)
>> #define DVC_STATUS 0x00c
>> #define DVC_STATUS_I2C_DONE_INTR BIT(30)
>>
>> -#define I2C_ERR_NONE 0x00
>> -#define I2C_ERR_NO_ACK 0x01
>> -#define I2C_ERR_ARBITRATION_LOST 0x02
>> -#define I2C_ERR_UNKNOWN_INTERRUPT 0x04
>> +#define I2C_ERR_NONE 0x0
>> +#define I2C_ERR_NO_ACK BIT(0)
>> +#define I2C_ERR_ARBITRATION_LOST BIT(1)
>> +#define I2C_ERR_UNKNOWN_INTERRUPT BIT(2)
>> +#define I2C_ERR_UNEXPECTED_STATUS BIT(3)
>>
>> #define PACKET_HEADER0_HEADER_SIZE_SHIFT 28
>> #define PACKET_HEADER0_PACKET_ID_SHIFT 16
>> @@ -280,6 +281,7 @@ struct tegra_i2c_dev {
>> u32 bus_clk_rate;
>> u16 clk_divisor_non_hs_mode;
>> bool is_multimaster_mode;
>> + /* xfer_lock: lock to serialize transfer submission and processing */
>> spinlock_t xfer_lock;
>> struct dma_chan *tx_dma_chan;
>> struct dma_chan *rx_dma_chan;
>> @@ -306,7 +308,7 @@ static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
>> * to the I2C block inside the DVC block
>> */
>> static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
>> - unsigned long reg)
>> + unsigned long reg)
>> {
>> if (i2c_dev->is_dvc)
>> reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
>> @@ -314,7 +316,7 @@ static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
>> }
>>
>> static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
>> - unsigned long reg)
>> + unsigned long reg)
>> {
>> writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
>>
>> @@ -329,13 +331,13 @@ static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
>> }
>>
>> static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data,
>> - unsigned long reg, int len)
>> + unsigned long reg, int len)
>> {
>> writesl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
>> }
>>
>> static void i2c_readsl(struct tegra_i2c_dev *i2c_dev, void *data,
>> - unsigned long reg, int len)
>> + unsigned long reg, int len)
>> {
>> readsl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
>> }
>> @@ -486,7 +488,7 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
>> dev_warn(i2c_dev->dev, "timeout waiting for fifo flush\n");
>> return -ETIMEDOUT;
>> }
>> - msleep(1);
>> + usleep_range(1000, 2000);
>> }
>> return 0;
>> }
>> @@ -525,7 +527,6 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
>> * prevent overwriting past the end of buf
>> */
>> if (rx_fifo_avail > 0 && buf_remaining > 0) {
>> - BUG_ON(buf_remaining > 3);
>> val = i2c_readl(i2c_dev, I2C_RX_FIFO);
>> val = cpu_to_le32(val);
>> memcpy(buf, &val, buf_remaining);
>> @@ -533,7 +534,6 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
>> rx_fifo_avail--;
>> }
>>
>> - BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
>> i2c_dev->msg_buf_remaining = buf_remaining;
>> i2c_dev->msg_buf = buf;
>>
>> @@ -591,7 +591,6 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
>> * boundary and fault.
>> */
>> if (tx_fifo_avail > 0 && buf_remaining > 0) {
>> - BUG_ON(buf_remaining > 3);
>> memcpy(&val, buf, buf_remaining);
>> val = le32_to_cpu(val);
>>
>> @@ -680,10 +679,11 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
>> i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
>> if (in_interrupt())
>> err = readl_poll_timeout_atomic(addr, val, val == 0,
>> - 1000, I2C_CONFIG_LOAD_TIMEOUT);
>> + 1000,
>> + I2C_CONFIG_LOAD_TIMEOUT);
>> else
>> - err = readl_poll_timeout(addr, val, val == 0,
>> - 1000, I2C_CONFIG_LOAD_TIMEOUT);
>> + err = readl_poll_timeout(addr, val, val == 0, 1000,
>> + I2C_CONFIG_LOAD_TIMEOUT);
>>
>> if (err) {
>> dev_warn(i2c_dev->dev,
>> @@ -856,10 +856,13 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
>>
>> if (!i2c_dev->is_curr_dma_xfer) {
>> if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
>> - if (i2c_dev->msg_buf_remaining)
>> + if (i2c_dev->msg_buf_remaining) {
>> tegra_i2c_empty_rx_fifo(i2c_dev);
>> - else
>> - BUG();
>> + } else {
>> + dev_err(i2c_dev->dev, "unexpected rx data request\n");
>> + i2c_dev->msg_err |= I2C_ERR_UNEXPECTED_STATUS;
>> + goto err;
>> + }
>> }
>>
>> if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
>> @@ -885,7 +888,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
>> if (status & I2C_INT_PACKET_XFER_COMPLETE) {
>> if (i2c_dev->is_curr_dma_xfer)
>> i2c_dev->msg_buf_remaining = 0;
>> - BUG_ON(i2c_dev->msg_buf_remaining);
>> + WARN_ON_ONCE(i2c_dev->msg_buf_remaining);
>> complete(&i2c_dev->msg_complete);
>> }
>> goto done;
>> @@ -1024,7 +1027,7 @@ static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
>> }
>>
>> static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>> - struct i2c_msg *msg, enum msg_end_type end_state)
>> + struct i2c_msg *msg, enum msg_end_type end_state)
>
> Probably won't hurt to carry the "enum msg_end_type end_state" to a new
> line.
OK
>
>> {
>> u32 packet_header;
>> u32 int_mask;
>> @@ -1161,9 +1164,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>> if (err)
>> return err;
>>
>> - time_left = wait_for_completion_timeout(
>> - &i2c_dev->dma_complete,
>> - msecs_to_jiffies(xfer_time));
>> + time_left = wait_for_completion_timeout(&i2c_dev->dma_complete,
>> + msecs_to_jiffies(xfer_time));
>> if (time_left == 0) {
>> dev_err(i2c_dev->dev, "DMA transfer timeout\n");
>> dmaengine_terminate_sync(i2c_dev->msg_read ?
>> @@ -1225,7 +1227,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>> }
>>
>> static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
>> - int num)
>> + int num)
>> {
>> struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
>> int i;
>> @@ -1273,12 +1275,12 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
>> int ret;
>>
>> ret = of_property_read_u32(np, "clock-frequency",
>> - &i2c_dev->bus_clk_rate);
>> + &i2c_dev->bus_clk_rate);
>> if (ret)
>> i2c_dev->bus_clk_rate = 100000; /* default clock rate */
>>
>> i2c_dev->is_multimaster_mode = of_property_read_bool(np,
>> - "multi-master");
>> + "multi-master");
>
> You can avoid the line-split with something like this:
>
> ret = of_property_read_bool(np, "multi-master");
> i2c_dev->is_multimaster_mode = ret;
>
OK.
I shall share the patches next.
-Thanks,
Bitan
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