This serie replaces the patch from Holger Assmann [i2c: stm32: remove
unnecessary DMA kernel error log] (1) and the first version of [i2c: stm32:
do not display error when DMA is not requested] from myself (2).
A first patch is fixing useless error print when not being able to get
DMA channel (DMA is only optional) and also avoid printing twice an error
when a real DMA error is happening.
On top of that, dev_err_probe from Krzysztof has been rebased.
[1] https://marc.info/?l=linux-i2c&m=159741480608578&w=2
[2] https://marc.info/?l=linux-i2c&m=159973040314193&w=2
Alain Volmat (1):
i2c: stm32: fix error message on upon dma_request_chan & defer
handling
Krzysztof Kozlowski (1):
i2c: stm32: Simplify with dev_err_probe()
drivers/i2c/busses/i2c-stm32.c | 12 ++++++------
drivers/i2c/busses/i2c-stm32f4.c | 6 ++----
drivers/i2c/busses/i2c-stm32f7.c | 27 +++++++++++----------------
3 files changed, 19 insertions(+), 26 deletions(-)
--
2.7.4
DMA usage is optional for the I2C driver. check for the -ENODEV
error in order to avoid displaying an error when no DMA
has been requested.
Cleaning up the error messages during probe, remove the additional
-EPROBE_DEFER within probe function since additional error message
doesn't give much more information than what is already reported
within the stm32_i2c_dma_request function.
CC: Krzysztof Kozlowski <[email protected]>
CC: Holger Assmann <[email protected]>
Signed-off-by: Alain Volmat <[email protected]>
---
This patch replaces the patch [i2c: stm32: do not display error when DMA is not requested]
previously sent on the mailing list.
---
drivers/i2c/busses/i2c-stm32.c | 6 ++----
drivers/i2c/busses/i2c-stm32f7.c | 13 ++++++-------
2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c
index 3f69a3bb6119..468620db9ea5 100644
--- a/drivers/i2c/busses/i2c-stm32.c
+++ b/drivers/i2c/busses/i2c-stm32.c
@@ -26,7 +26,7 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
dma->chan_tx = dma_request_chan(dev, "tx");
if (IS_ERR(dma->chan_tx)) {
ret = PTR_ERR(dma->chan_tx);
- if (ret != -EPROBE_DEFER)
+ if ((ret != -ENODEV) && (ret != -EPROBE_DEFER))
dev_err(dev, "can't request DMA tx channel\n");
goto fail_al;
}
@@ -46,7 +46,7 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
dma->chan_rx = dma_request_chan(dev, "rx");
if (IS_ERR(dma->chan_rx)) {
ret = PTR_ERR(dma->chan_rx);
- if (ret != -EPROBE_DEFER)
+ if ((ret != -ENODEV) && (ret != -EPROBE_DEFER))
dev_err(dev, "can't request DMA rx channel\n");
goto fail_tx;
@@ -76,8 +76,6 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
dma_release_channel(dma->chan_tx);
fail_al:
devm_kfree(dev, dma);
- if (ret != -EPROBE_DEFER)
- dev_info(dev, "can't use DMA\n");
return ERR_PTR(ret);
}
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index bff3479fe122..8a61320a9cb9 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -2052,14 +2052,13 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
i2c_dev->dma = stm32_i2c_dma_request(i2c_dev->dev, phy_addr,
STM32F7_I2C_TXDR,
STM32F7_I2C_RXDR);
- if (PTR_ERR(i2c_dev->dma) == -ENODEV)
- i2c_dev->dma = NULL;
- else if (IS_ERR(i2c_dev->dma)) {
+ if (IS_ERR(i2c_dev->dma)) {
ret = PTR_ERR(i2c_dev->dma);
- if (ret != -EPROBE_DEFER)
- dev_err(&pdev->dev,
- "Failed to request dma error %i\n", ret);
- goto fmp_clear;
+ /* DMA support is optional, only report other errors */
+ if (ret != -ENODEV)
+ goto fmp_clear;
+ dev_dbg(i2c_dev->dev, "No DMA option: fallback using interrupts\n");
+ i2c_dev->dma = NULL;
}
if (i2c_dev->wakeup_src) {
--
2.7.4
From: Krzysztof Kozlowski <[email protected]>
Common pattern of handling deferred probe can be simplified with
dev_err_probe(). Less code and the error value gets printed.
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Alain Volmat <[email protected]>
---
v2: rebased on top of patch [i2c: stm32: fix error message on upon
dma_request_chan & defer handling]
---
drivers/i2c/busses/i2c-stm32.c | 10 ++++++----
drivers/i2c/busses/i2c-stm32f4.c | 6 ++----
drivers/i2c/busses/i2c-stm32f7.c | 14 +++++---------
3 files changed, 13 insertions(+), 17 deletions(-)
diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c
index 468620db9ea5..157c64e27d0b 100644
--- a/drivers/i2c/busses/i2c-stm32.c
+++ b/drivers/i2c/busses/i2c-stm32.c
@@ -26,8 +26,9 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
dma->chan_tx = 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\n");
+ if (ret != -ENODEV)
+ ret = dev_err_probe(dev, ret,
+ "can't request DMA tx channel\n");
goto fail_al;
}
@@ -46,8 +47,9 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
dma->chan_rx = 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\n");
+ if (ret != -ENODEV)
+ ret = dev_err_probe(dev, ret,
+ "can't request DMA rx channel\n");
goto fail_tx;
}
diff --git a/drivers/i2c/busses/i2c-stm32f4.c b/drivers/i2c/busses/i2c-stm32f4.c
index 48e269284369..937c2c8fd349 100644
--- a/drivers/i2c/busses/i2c-stm32f4.c
+++ b/drivers/i2c/busses/i2c-stm32f4.c
@@ -797,10 +797,8 @@ static int stm32f4_i2c_probe(struct platform_device *pdev)
rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(rst)) {
- ret = PTR_ERR(rst);
- if (ret != -EPROBE_DEFER)
- dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
-
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(rst),
+ "Error: Missing reset ctrl\n");
goto clk_free;
}
reset_control_assert(rst);
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 8a61320a9cb9..0fbd964c2fe8 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1968,11 +1968,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
"wakeup-source");
i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(i2c_dev->clk)) {
- if (PTR_ERR(i2c_dev->clk) != -EPROBE_DEFER)
- dev_err(&pdev->dev, "Failed to get controller clock\n");
- return PTR_ERR(i2c_dev->clk);
- }
+ if (IS_ERR(i2c_dev->clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(i2c_dev->clk),
+ "Failed to get controller clock\n");
ret = clk_prepare_enable(i2c_dev->clk);
if (ret) {
@@ -1982,10 +1980,8 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(rst)) {
- ret = PTR_ERR(rst);
- if (ret != -EPROBE_DEFER)
- dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
-
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(rst),
+ "Error: Missing reset ctrl\n");
goto clk_free;
}
reset_control_assert(rst);
--
2.7.4