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Date: Fri, 21 Oct 2016 13:37:08 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Luis.Oliveira@...opsys.com, jarkko.nikula@...ux.intel.com,
mika.westerberg@...ux.intel.com, wsa@...-dreams.de,
linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
robh+dt@...nel.org, mark.rutland@....com,
devicetree@...r.kernel.org
Cc: CARLOS.PALMINHA@...opsys.com, Ramiro.Oliveira@...opsys.com
Subject: Re: [PATCH v2 1/4] Factor out _master() parts of code and identify
as much as possible all related with MASTER mode
On Fri, 2016-10-14 at 17:52 +0100, Luis.Oliveira@...opsys.com wrote:
> From: Luis Oliveira <lolivei@...opsys.com>
This wouldn't be here.
>
Something wrong with your commit message. Perhaps you were into SVN,
here is a bit different format of the commit messages, i.e.
1. Summary / Subject line — short description
2. Empty line
3. Full description in free form
4. Empty line
5. Tags, such as SoB (Signed-off-by), TB (Tested-by), Fixes, etc.
> @@ -201,6 +203,17 @@ static void dw_writel(struct dw_i2c_dev *dev, u32
> b, int offset)
> }
> }
>
> +static void i2c_dw_configure_fifo_master(struct dw_i2c_dev *dev)
> +{
> + /* Configure Tx/Rx FIFO threshold levels */
> + dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
> + dw_writel(dev, 0, DW_IC_RX_TL);
> +
> + /* configure the i2c master */
I understand you just moved existing lines, though here is a good chance
to do small style fixes to the comments, i.e. use capital letter.
> + dw_writel(dev, dev->master_cfg , DW_IC_CON);
> + dw_writel(dev, DW_IC_INTR_MASTER_MASK,
> DW_IC_INTR_MASK);
Too much indentation. One tab is enough here.
> +}
> @@ -431,12 +444,9 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
> "Hardware too old to adjust SDA hold
> time.\n");
> }
>
> - /* Configure Tx/Rx FIFO threshold levels */
> - dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
> - dw_writel(dev, 0, DW_IC_RX_TL);
> -
> - /* configure the i2c master */
> - dw_writel(dev, dev->master_cfg , DW_IC_CON);
> + if ((dev->master_cfg & DW_IC_CON_MASTER) &&
> + (dev->master_cfg & DW_IC_CON_SLAVE_DISABLE))
Ditto. Align both conditions to be like tabular view.
> + i2c_dw_configure_fifo_master(dev);
>
> i2c_dw_release_lock(dev);
>
> @@ -480,7 +490,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev
> *dev)
> */
> ic_status = dw_readl(dev, DW_IC_STATUS);
> if (!dev->dynamic_tar_update_enabled ||
> - (ic_status & DW_IC_STATUS_MST_ACTIVITY) ||
> + (ic_status & DW_IC_STATUS_MASTER_ACTIVITY) ||
> !(ic_status & DW_IC_STATUS_TFE)) {
> __i2c_dw_enable_and_wait(dev, false);
> enabled = false;
> @@ -520,7 +530,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev
> *dev)
>
> /* Clear and enable interrupts */
> dw_readl(dev, DW_IC_CLR_INTR);
> - dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
> + dw_writel(dev, DW_IC_INTR_MASTER_MASK, DW_IC_INTR_MASK);
> }
>
> /*
> @@ -540,7 +550,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
> u8 *buf = dev->tx_buf;
> bool need_restart = false;
>
> - intr_mask = DW_IC_INTR_DEFAULT_MASK;
> + intr_mask = DW_IC_INTR_MASTER_MASK;
>
> for (; dev->msg_write_idx < dev->msgs_num; dev-
> >msg_write_idx++) {
> /*
> @@ -839,19 +849,13 @@ static u32 i2c_dw_read_clear_intrbits(struct
> dw_i2c_dev *dev)
> * Interrupt service routine. This gets called whenever an I2C
> interrupt
Perhaps '...I2C master interrupt occurs.' Or move this comment towards
common handler function.
> * occurs.
> */
> -static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
> -{
> - struct dw_i2c_dev *dev = dev_id;
> - u32 stat, enabled;
> -
> - enabled = dw_readl(dev, DW_IC_ENABLE);
> - stat = dw_readl(dev, DW_IC_RAW_INTR_STAT);
> - dev_dbg(dev->dev, "%s: enabled=%#x stat=%#x\n", __func__,
> enabled, stat);
> - if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
> - return IRQ_NONE;
>
> +static bool i2c_dw_irq_handler_master(struct dw_i2c_dev *dev )
> +{
> + u32 stat;
> +
> stat = i2c_dw_read_clear_intrbits(dev);
> -
> +
This change shouldn't be here.
> if (stat & DW_IC_INTR_TX_ABRT) {
> dev->cmd_err |= DW_IC_ERR_TX_ABRT;
> dev->status = STATUS_IDLE;
> @@ -895,7 +899,26 @@ tx_aborted:
> i2c_dw_disable_int(dev);
> dw_writel(dev, stat, DW_IC_INTR_MASK);
> }
> + return true;
> +}
> +
> +static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
> +{
> + struct dw_i2c_dev *dev = dev_id;
> + u32 stat, enabled, mode;
> +
> + enabled = dw_readl(dev, DW_IC_ENABLE);
> + mode = dw_readl(dev, DW_IC_CON);
Hmm... It's defined but not used?
> + stat = dw_readl(dev, DW_IC_RAW_INTR_STAT);
> +
> + dev_dbg(dev->dev, "%s: enabled=%#x stat=%#x\n", __func__,
> enabled, stat);
> + if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
> + return IRQ_NONE;
>
> + if(i2c_dw_irq_handler_master(dev))
Keep style — 'if ('.
> + return IRQ_HANDLED;
> +
Check for trailing whitespaces. Please, don't add new ones. Good start
is to run checkpatch.pl before send them.
> + complete(&dev->cmd_complete);
Didn't find removal of the line. Is it new code? Shouldn't be here if
so.
> return IRQ_HANDLED;
> }
>
> diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c
> b/drivers/i2c/busses/i2c-designware-platdrv.c
> index 0b42a12..d5986c2 100644
> --- a/drivers/i2c/busses/i2c-designware-platdrv.c
> +++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> @@ -138,6 +138,29 @@ static inline int dw_i2c_acpi_configure(struct
> platform_device *pdev)
> }
> #endif
>
> +static void i2c_dw_configure_master(struct platform_device *pdev)
> +{
> + struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE
> |
> + DW_IC_CON_RESTART_EN;
> +
> + dev->functionality |= I2C_FUNC_10BIT_ADDR;
> + dev_info(&pdev->dev, "I am registed as a I2C Master!\n");
> +
> + switch (dev->clk_freq) {
> + case 100000:
> + dev->master_cfg |= DW_IC_CON_SPEED_STD;
> + break;
> + case 3400000:
> + dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
> + break;
> + default:
> + dev->master_cfg |= DW_IC_CON_SPEED_FAST;
> + }
> +
Again, trailing white space and moreover redundant entire line since
it's empty and doesn't bring any readability.
> +}
> +
> static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool
> prepare)
> {
> if (IS_ERR(i_dev->clk))
> @@ -222,19 +245,7 @@ static int dw_i2c_plat_probe(struct
> platform_device *pdev)
> I2C_FUNC_SMBUS_WORD_DATA |
> I2C_FUNC_SMBUS_I2C_BLOCK;
>
> - dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE
> |
> - DW_IC_CON_RESTART_EN;
> -
> - switch (dev->clk_freq) {
> - case 100000:
> - dev->master_cfg |= DW_IC_CON_SPEED_STD;
> - break;
> - case 3400000:
> - dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
> - break;
> - default:
> - dev->master_cfg |= DW_IC_CON_SPEED_FAST;
> - }
> + i2c_dw_configure_master(pdev);
>
> dev->clk = devm_clk_get(&pdev->dev, NULL);
> if (!i2c_dw_plat_prepare_clk(dev, true)) {
--
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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