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Commit b061cda4 authored by Shrey Vijay's avatar Shrey Vijay Committed by Vipin Deep Kaur
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i2c-qcom-geni: Add support to disable autosuspend 



Add support to disable I2C-QCOM-GENI driver autosuspend
through DT property.

Signed-off-by: default avatarShrey Vijay <shreyv@codeaurora.org>
Signed-off-by: default avatarVipin Deep Kaur <vkaur@codeaurora.org>
Change-Id: I44ce67f93536a0b088cc114fe72978d4bd85eaaa
parent 8f25c5b6

Documentation/devicetree/bindings/i2c/qcom,i2c-qcom-geni.txt

+3 −0
Original line number Diff line number Diff line
@@ -17,6 +17,9 @@ Required properties: 
Optional property:

 - qcom,clk-freq-out : Desired I2C bus clock frequency in Hz.

   When missing default to 400000Hz.

 - qcom,disable-autosuspend : Disable autosuspend for I2C controller and

   I2C clients should call pm_runtime_get_sync()/put_sync() for the

   I2C controller.



Child nodes should conform to i2c bus binding.

drivers/i2c/busses/i2c-qcom-geni.c

+30 −4
Original line number Diff line number Diff line
@@ -121,6 +121,7 @@ struct geni_i2c_dev { 
	struct msm_gpi_dma_async_tx_cb_param tx_cb;

	struct msm_gpi_dma_async_tx_cb_param rx_cb;

	enum i2c_se_mode se_mode;

	bool autosuspend_disable;

};



struct geni_i2c_err_log {
@@ -641,6 +642,7 @@ static int geni_i2c_xfer(struct i2c_adapter *adap, 
{

	struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);

	int i, ret = 0, timeout = 0;

	int ref = 0;



	gi2c->err = 0;

	gi2c->cur = &msgs[0];
@@ -654,6 +656,12 @@ static int geni_i2c_xfer(struct i2c_adapter *adap, 
		pm_runtime_set_suspended(gi2c->dev);

		return ret;

	}

	ref = atomic_read(&gi2c->dev->power.usage_count);

	if (ref <= 0) {

		GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,

			"resume usage count mismatch:%d\n", ref);

	}



	if (gi2c->se_mode == GSI_ONLY) {

		ret = geni_i2c_gsi_xfer(adap, msgs, num);

		goto geni_i2c_txn_ret;
@@ -759,8 +767,17 @@ static int geni_i2c_xfer(struct i2c_adapter *adap, 
	if (ret == 0)

		ret = num;



	if (gi2c->autosuspend_disable) {

		pm_runtime_put_sync(gi2c->dev);

		ref = atomic_read(&gi2c->dev->power.usage_count);

		if (ref < 0)

			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,

				"suspend usage count mismatch:%d\n", ref);

	} else {

		pm_runtime_mark_last_busy(gi2c->dev);

		pm_runtime_put_autosuspend(gi2c->dev);

	}



	gi2c->cur = NULL;

	gi2c->err = 0;

	dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret);
@@ -874,6 +891,9 @@ static int geni_i2c_probe(struct platform_device *pdev) 
		gi2c->i2c_rsc.clk_freq_out = KHz(400);

	}



	gi2c->autosuspend_disable = of_property_read_bool(pdev->dev.of_node,

									"qcom,disable-autosuspend");



	gi2c->irq = platform_get_irq(pdev, 0);

	if (gi2c->irq < 0) {

		dev_err(gi2c->dev, "IRQ error for i2c-geni\n");
@@ -905,8 +925,11 @@ static int geni_i2c_probe(struct platform_device *pdev) 
	strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));



	pm_runtime_set_suspended(gi2c->dev);

	pm_runtime_set_autosuspend_delay(gi2c->dev, I2C_AUTO_SUSPEND_DELAY);

	if (!gi2c->autosuspend_disable) {

		pm_runtime_set_autosuspend_delay(gi2c->dev,

							I2C_AUTO_SUSPEND_DELAY);

		pm_runtime_use_autosuspend(gi2c->dev);

	}

	pm_runtime_enable(gi2c->dev);

	i2c_add_adapter(&gi2c->adap);
@@ -994,6 +1017,9 @@ static int geni_i2c_runtime_resume(struct device *dev) 
				    "i2c fifo/se-dma mode. fifo depth:%d\n",

				    gi2c_tx_depth);

		}

		if (gi2c->autosuspend_disable)

			GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,

					    "i2c in autosuspend disable mode\n");

	}

	if (gi2c->se_mode == FIFO_SE_DMA)

		enable_irq(gi2c->irq);