From a9503a2ecd95e23d7243bcde7138192de8c1c281 Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Sat, 5 Jul 2025 09:57:37 +0200 Subject: [PATCH 1/4] i2c: omap: Handle omap_i2c_init() errors in omap_i2c_probe() omap_i2c_init() can fail. Handle this error in omap_i2c_probe(). Fixes: 010d442c4a29 ("i2c: New bus driver for TI OMAP boards") Signed-off-by: Christophe JAILLET Cc: # v2.6.19+ Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/565311abf9bafd7291ca82bcecb48c1fac1e727b.1751701715.git.christophe.jaillet@wanadoo.fr --- drivers/i2c/busses/i2c-omap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 8b01df3cc8e9..17db58195c06 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1472,7 +1472,9 @@ omap_i2c_probe(struct platform_device *pdev) } /* reset ASAP, clearing any IRQs */ - omap_i2c_init(omap); + r = omap_i2c_init(omap); + if (r) + goto err_mux_state_deselect; if (omap->rev < OMAP_I2C_OMAP1_REV_2) r = devm_request_irq(&pdev->dev, omap->irq, omap_i2c_omap1_isr, @@ -1515,6 +1517,7 @@ omap_i2c_probe(struct platform_device *pdev) err_unuse_clocks: omap_i2c_write_reg(omap, OMAP_I2C_CON_REG, 0); +err_mux_state_deselect: if (omap->mux_state) mux_state_deselect(omap->mux_state); err_put_pm: From 60c016afccac7acb78a43b9c75480887ed3ce48e Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Sat, 5 Jul 2025 09:57:38 +0200 Subject: [PATCH 2/4] i2c: omap: Fix an error handling path in omap_i2c_probe() If an error occurs after pm_runtime_use_autosuspend(), a corresponding pm_runtime_dont_use_autosuspend() should be called. In case of error in pm_runtime_resume_and_get(), it is not the case because the error handling path is wrongly ordered. Fix it. Fixes: 780f62974125 ("i2c: omap: fix reference leak when pm_runtime_get_sync fails") Signed-off-by: Christophe JAILLET Cc: # v5.13+ Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/af8a9b62996bebbaaa7c02986aa2a8325ef11596.1751701715.git.christophe.jaillet@wanadoo.fr --- drivers/i2c/busses/i2c-omap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 17db58195c06..5fcc9f6c33e5 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1521,9 +1521,9 @@ omap_i2c_probe(struct platform_device *pdev) if (omap->mux_state) mux_state_deselect(omap->mux_state); err_put_pm: - pm_runtime_dont_use_autosuspend(omap->dev); pm_runtime_put_sync(omap->dev); err_disable_pm: + pm_runtime_dont_use_autosuspend(omap->dev); pm_runtime_disable(&pdev->dev); return r; From c870cbbd71fccda71d575f0acd4a8d2b7cd88861 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Cl=C3=A9ment=20Le=20Goffic?= Date: Fri, 4 Jul 2025 10:39:14 +0200 Subject: [PATCH 3/4] i2c: stm32: fix the device used for the DMA map MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If the DMA mapping failed, it produced an error log with the wrong device name: "stm32-dma3 40400000.dma-controller: rejecting DMA map of vmalloc memory" Fix this issue by replacing the dev with the I2C dev. Fixes: bb8822cbbc53 ("i2c: i2c-stm32: Add generic DMA API") Signed-off-by: Clément Le Goffic Cc: # v4.18+ Acked-by: Alain Volmat Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/20250704-i2c-upstream-v4-1-84a095a2c728@foss.st.com --- drivers/i2c/busses/i2c-stm32.c | 8 +++----- drivers/i2c/busses/i2c-stm32f7.c | 4 ++-- 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c index 157c64e27d0b..f84ec056e36d 100644 --- a/drivers/i2c/busses/i2c-stm32.c +++ b/drivers/i2c/busses/i2c-stm32.c @@ -102,7 +102,6 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma, void *dma_async_param) { struct dma_async_tx_descriptor *txdesc; - struct device *chan_dev; int ret; if (rd_wr) { @@ -116,11 +115,10 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma, } dma->dma_len = len; - chan_dev = dma->chan_using->device->dev; - dma->dma_buf = dma_map_single(chan_dev, buf, dma->dma_len, + dma->dma_buf = dma_map_single(dev, buf, dma->dma_len, dma->dma_data_dir); - if (dma_mapping_error(chan_dev, dma->dma_buf)) { + if (dma_mapping_error(dev, dma->dma_buf)) { dev_err(dev, "DMA mapping failed\n"); return -EINVAL; } @@ -150,7 +148,7 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma, return 0; err: - dma_unmap_single(chan_dev, dma->dma_buf, dma->dma_len, + dma_unmap_single(dev, dma->dma_buf, dma->dma_len, dma->dma_data_dir); return ret; } diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index e4aaeb2262d0..817d081460c2 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -741,10 +741,10 @@ static void stm32f7_i2c_dma_callback(void *arg) { struct stm32f7_i2c_dev *i2c_dev = (struct stm32f7_i2c_dev *)arg; struct stm32_i2c_dma *dma = i2c_dev->dma; - struct device *dev = dma->chan_using->device->dev; stm32f7_i2c_disable_dma_req(i2c_dev); - dma_unmap_single(dev, dma->dma_buf, dma->dma_len, dma->dma_data_dir); + dma_unmap_single(i2c_dev->dev, dma->dma_buf, dma->dma_len, + dma->dma_data_dir); complete(&dma->dma_complete); } From 6aae87fe7f180cd93a74466cdb6cf2aa9bb28798 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Cl=C3=A9ment=20Le=20Goffic?= Date: Fri, 4 Jul 2025 10:39:15 +0200 Subject: [PATCH 4/4] i2c: stm32f7: unmap DMA mapped buffer MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before each I2C transfer using DMA, the I2C buffer is DMA'pped to make sure the memory buffer is DMA'able. This is handle in the function `stm32_i2c_prep_dma_xfer()`. If the transfer fails for any reason the I2C buffer must be unmap. Use the dma_callback to factorize the code and fix this issue. Note that the `stm32f7_i2c_dma_callback()` is now called in case of DMA transfer success and error and that the `complete()` on the dma_complete completion structure is done inconditionnally in case of transfer success or error as well as the `dmaengine_terminate_async()`. This is allowed as a `complete()` in case transfer error has no effect as well as a `dmaengine_terminate_async()` on a transfer success. Also fix the unneeded cast and remove not more needed variables. Fixes: 7ecc8cfde553 ("i2c: i2c-stm32f7: Add DMA support") Signed-off-by: Clément Le Goffic Cc: # v4.18+ Acked-by: Alain Volmat Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/20250704-i2c-upstream-v4-2-84a095a2c728@foss.st.com --- drivers/i2c/busses/i2c-stm32f7.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index 817d081460c2..73a7b8894c0d 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -739,10 +739,11 @@ static void stm32f7_i2c_disable_dma_req(struct stm32f7_i2c_dev *i2c_dev) static void stm32f7_i2c_dma_callback(void *arg) { - struct stm32f7_i2c_dev *i2c_dev = (struct stm32f7_i2c_dev *)arg; + struct stm32f7_i2c_dev *i2c_dev = arg; struct stm32_i2c_dma *dma = i2c_dev->dma; stm32f7_i2c_disable_dma_req(i2c_dev); + dmaengine_terminate_async(dma->chan_using); dma_unmap_single(i2c_dev->dev, dma->dma_buf, dma->dma_len, dma->dma_data_dir); complete(&dma->dma_complete); @@ -1510,7 +1511,6 @@ static irqreturn_t stm32f7_i2c_handle_isr_errs(struct stm32f7_i2c_dev *i2c_dev, u16 addr = f7_msg->addr; void __iomem *base = i2c_dev->base; struct device *dev = i2c_dev->dev; - struct stm32_i2c_dma *dma = i2c_dev->dma; /* Bus error */ if (status & STM32F7_I2C_ISR_BERR) { @@ -1551,10 +1551,8 @@ static irqreturn_t stm32f7_i2c_handle_isr_errs(struct stm32f7_i2c_dev *i2c_dev, } /* Disable dma */ - if (i2c_dev->use_dma) { - stm32f7_i2c_disable_dma_req(i2c_dev); - dmaengine_terminate_async(dma->chan_using); - } + if (i2c_dev->use_dma) + stm32f7_i2c_dma_callback(i2c_dev); i2c_dev->master_mode = false; complete(&i2c_dev->complete); @@ -1600,7 +1598,6 @@ static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data) { struct stm32f7_i2c_dev *i2c_dev = data; struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg; - struct stm32_i2c_dma *dma = i2c_dev->dma; void __iomem *base = i2c_dev->base; u32 status, mask; int ret; @@ -1619,10 +1616,8 @@ static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data) dev_dbg(i2c_dev->dev, "<%s>: Receive NACK (addr %x)\n", __func__, f7_msg->addr); writel_relaxed(STM32F7_I2C_ICR_NACKCF, base + STM32F7_I2C_ICR); - if (i2c_dev->use_dma) { - stm32f7_i2c_disable_dma_req(i2c_dev); - dmaengine_terminate_async(dma->chan_using); - } + if (i2c_dev->use_dma) + stm32f7_i2c_dma_callback(i2c_dev); f7_msg->result = -ENXIO; } @@ -1640,8 +1635,7 @@ static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data) ret = wait_for_completion_timeout(&i2c_dev->dma->dma_complete, HZ); if (!ret) { dev_dbg(i2c_dev->dev, "<%s>: Timed out\n", __func__); - stm32f7_i2c_disable_dma_req(i2c_dev); - dmaengine_terminate_async(dma->chan_using); + stm32f7_i2c_dma_callback(i2c_dev); f7_msg->result = -ETIMEDOUT; } }