Merge tag 'i2c-host-fixes-7.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux into i2c/for-current

i2c-host-fixes for v7.1-rc8

- imx: keep clock and pinctrl states consistent in runtime PM
- imx-lpi2c: fix DMA resource leaks on PIO fallback
- qcom-cci: fix NULL pointer dereference on remove
- riic: fix reset refcount leak on resume_noirq error path
- stm32f7: account for analog filter in timing computation
- tegra: fix suspend/resume handling in NOIRQ phase
- tegra: update Tegra410 I2C timings to match hardware specs
- MAINTAINERS: hand over I2C maintainership to Andi

7 files changed, 87 insertions, 58 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 5db066273907..c18a612905ab 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12095,11 +12095,11 @@ F:	Documentation/i2c/busses/i2c-parport.rst
 F:	drivers/i2c/busses/i2c-parport.c
 
 I2C SUBSYSTEM
-M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
+M:	Andi Shyti <andi.shyti@kernel.org>
 L:	linux-i2c@vger.kernel.org
 S:	Maintained
 Q:	https://patchwork.ozlabs.org/project/linux-i2c/list/
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git
 F:	Documentation/i2c/
 F:	drivers/i2c/*
 F:	include/dt-bindings/i2c/i2c.h
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index a01c23696481..cd4da50c4dd9 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -1383,55 +1383,66 @@ static int lpi2c_imx_init_recovery_info(struct lpi2c_imx_struct *lpi2c_imx,
 	return 0;
 }
 
-static void dma_exit(struct device *dev, struct lpi2c_imx_dma *dma)
-{
-	if (dma->chan_rx)
-		dma_release_channel(dma->chan_rx);
-
-	if (dma->chan_tx)
-		dma_release_channel(dma->chan_tx);
-
-	devm_kfree(dev, dma);
-}
-
 static int lpi2c_dma_init(struct device *dev, dma_addr_t phy_addr)
 {
 	struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
 	struct lpi2c_imx_dma *dma;
+	void *group;
 	int ret;
 
-	dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
-	if (!dma)
+	/*
+	 * Open a devres group so that all resources allocated within
+	 * this function can be released together if DMA init fails but
+	 * probe continues in PIO mode.
+	 */
+	group = devres_open_group(dev, NULL, GFP_KERNEL);
+	if (!group)
 		return -ENOMEM;
 
+	dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
+	if (!dma) {
+		ret = -ENOMEM;
+		goto release_group;
+	}
+
 	dma->phy_addr = phy_addr;
 
 	/* Prepare for TX DMA: */
-	dma->chan_tx = dma_request_chan(dev, "tx");
+	dma->chan_tx = devm_dma_request_chan(dev, "tx");
 	if (IS_ERR(dma->chan_tx)) {
 		ret = PTR_ERR(dma->chan_tx);
 		if (ret != -ENODEV && ret != -EPROBE_DEFER)
 			dev_err(dev, "can't request DMA tx channel (%d)\n", ret);
-		dma->chan_tx = NULL;
-		goto dma_exit;
+		goto release_group;
 	}
 
 	/* Prepare for RX DMA: */
-	dma->chan_rx = dma_request_chan(dev, "rx");
+	dma->chan_rx = devm_dma_request_chan(dev, "rx");
 	if (IS_ERR(dma->chan_rx)) {
 		ret = PTR_ERR(dma->chan_rx);
 		if (ret != -ENODEV && ret != -EPROBE_DEFER)
 			dev_err(dev, "can't request DMA rx channel (%d)\n", ret);
-		dma->chan_rx = NULL;
-		goto dma_exit;
+		goto release_group;
 	}
 
+	/*
+	 * DMA init succeeded. Remove the group marker but keep all resources
+	 * bound to the device, they will be freed at device removal.
+	 */
+	devres_remove_group(dev, group);
+
 	lpi2c_imx->can_use_dma = true;
 	lpi2c_imx->dma = dma;
 	return 0;
 
-dma_exit:
-	dma_exit(dev, dma);
+release_group:
+	/*
+	 * DMA init failed. Release ALL resources allocated inside this
+	 * group (dma memory, TX channel if already acquired, etc.) so
+	 * that a successful PIO-mode probe does not hold unused resources
+	 * for the entire device lifetime.
+	 */
+	devres_release_group(dev, group);
 	return ret;
 }
 
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index a208fefd3c3b..28313d0fad37 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1892,9 +1892,15 @@ static void i2c_imx_remove(struct platform_device *pdev)
 static int i2c_imx_runtime_suspend(struct device *dev)
 {
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pinctrl_pm_select_sleep_state(dev);
+	if (ret)
+		return ret;
 
 	clk_disable(i2c_imx->clk);
-	return pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
 }
 
 static int i2c_imx_runtime_resume(struct device *dev)
@@ -1907,10 +1913,13 @@ static int i2c_imx_runtime_resume(struct device *dev)
 		return ret;
 
 	ret = clk_enable(i2c_imx->clk);
-	if (ret)
+	if (ret) {
 		dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);
+		pinctrl_pm_select_sleep_state(dev);
+		return ret;
+	}
 
-	return ret;
+	return 0;
 }
 
 static int i2c_imx_suspend(struct device *dev)
diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
index f3ccfbbc4bea..01e440b6585d 100644
--- a/drivers/i2c/busses/i2c-qcom-cci.c
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -660,8 +660,8 @@ static void cci_remove(struct platform_device *pdev)
 		if (cci->master[i].cci) {
 			i2c_del_adapter(&cci->master[i].adap);
 			of_node_put(cci->master[i].adap.dev.of_node);
+			cci_halt(cci, i);
 		}
-		cci_halt(cci, i);
 	}
 
 	disable_irq(cci->irq);
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 9e3595b3623e..6d2ebf67dd62 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -725,8 +725,10 @@ static int riic_i2c_resume_noirq(struct device *dev)
 		return ret;
 
 	ret = pm_runtime_force_resume(dev);
-	if (ret)
+	if (ret) {
+		reset_control_assert(riic->rstc);
 		return ret;
+	}
 
 	ret = riic_init_hw(riic);
 	if (ret) {
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 53d9df70ebe4..067af255bd22 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -694,6 +694,9 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
 	if (!of_property_read_bool(i2c_dev->dev->of_node, "i2c-digital-filter"))
 		i2c_dev->dnf_dt = STM32F7_I2C_DNF_DEFAULT;
 
+	i2c_dev->analog_filter = of_property_read_bool(i2c_dev->dev->of_node,
+						       "i2c-analog-filter");
+
 	do {
 		ret = stm32f7_i2c_compute_timing(i2c_dev, setup,
 						 &i2c_dev->timing);
@@ -715,9 +718,6 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
 		return ret;
 	}
 
-	i2c_dev->analog_filter = of_property_read_bool(i2c_dev->dev->of_node,
-						       "i2c-analog-filter");
-
 	dev_dbg(i2c_dev->dev, "I2C Speed(%i), Clk Source(%i)\n",
 		setup->speed_freq, setup->clock_src);
 	dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n",
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 479a1667e88d..400c9089daf0 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -2115,9 +2115,9 @@ static const struct tegra_i2c_hw_feature tegra264_i2c_hw = {
 static const struct tegra_i2c_hw_feature tegra410_i2c_hw = {
 	.has_continue_xfer_support = true,
 	.has_per_pkt_xfer_complete_irq = true,
-	.clk_divisor_hs_mode = 1,
+	.clk_divisor_hs_mode = 2,
 	.clk_divisor_std_mode = 0x3f,
-	.clk_divisor_fast_mode = 0x2c,
+	.clk_divisor_fast_mode = 0x2f,
 	.clk_divisor_fast_plus_mode = 0x11,
 	.has_config_load_reg = true,
 	.has_multi_master_mode = true,
@@ -2133,8 +2133,8 @@ static const struct tegra_i2c_hw_feature tegra410_i2c_hw = {
 	.thigh_fast_mode = 0x2,
 	.tlow_fastplus_mode = 0x2,
 	.thigh_fastplus_mode = 0x2,
-	.tlow_hs_mode = 0x8,
-	.thigh_hs_mode = 0x6,
+	.tlow_hs_mode = 0x5,
+	.thigh_hs_mode = 0x2,
 	.setup_hold_time_std_mode = 0x08080808,
 	.setup_hold_time_fast_mode = 0x02020202,
 	.setup_hold_time_fastplus_mode = 0x02020202,
@@ -2402,28 +2402,37 @@ static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
 
 static int __maybe_unused tegra_i2c_suspend(struct device *dev)
 {
+	/*
+	 * Bring the controller up and hold a usage count so it stays
+	 * available until the noirq phase.
+	 */
+	return pm_runtime_resume_and_get(dev);
+}
+
+static int __maybe_unused tegra_i2c_suspend_noirq(struct device *dev)
+{
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
-	int err;
 
 	i2c_mark_adapter_suspended(&i2c_dev->adapter);
 
-	if (!pm_runtime_status_suspended(dev)) {
-		err = tegra_i2c_runtime_suspend(dev);
-		if (err)
-			return err;
-	}
-
-	return 0;
+	/*
+	 * Runtime PM is already disabled at this point, so invoke the
+	 * runtime_suspend callback directly to put the controller down.
+	 */
+	return tegra_i2c_runtime_suspend(dev);
 }
 
-static int __maybe_unused tegra_i2c_resume(struct device *dev)
+static int __maybe_unused tegra_i2c_resume_noirq(struct device *dev)
 {
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
 	int err;
 
 	/*
-	 * We need to ensure that clocks are enabled so that registers can be
-	 * restored in tegra_i2c_init().
+	 * Runtime PM is still disabled at this point, so invoke the
+	 * runtime_resume callback directly to bring the controller back up
+	 * before re-initializing the hardware. The adapter is then marked
+	 * resumed so that consumers can issue transfers from their own
+	 * resume_noirq() handlers and onwards.
 	 */
 	err = tegra_i2c_runtime_resume(dev);
 	if (err)
@@ -2433,24 +2442,22 @@ static int __maybe_unused tegra_i2c_resume(struct device *dev)
 	if (err)
 		return err;
 
-	/*
-	 * In case we are runtime suspended, disable clocks again so that we
-	 * don't unbalance the clock reference counts during the next runtime
-	 * resume transition.
-	 */
-	if (pm_runtime_status_suspended(dev)) {
-		err = tegra_i2c_runtime_suspend(dev);
-		if (err)
-			return err;
-	}
-
 	i2c_mark_adapter_resumed(&i2c_dev->adapter);
 
 	return 0;
 }
 
+static int __maybe_unused tegra_i2c_resume(struct device *dev)
+{
+	pm_runtime_put(dev);
+
+	return 0;
+}
+
 static const struct dev_pm_ops tegra_i2c_pm = {
-	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume)
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend_noirq,
+				      tegra_i2c_resume_noirq)
 	SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume,
 			   NULL)
 };