* [PATCH v5 1/2] i2c: imx: notify about real errors on dma i2c_imx_dma_request
2019-01-09 5:56 [PATCH v5 0/2] i2c: imx: rework imx error handling Oleksij Rempel
@ 2019-01-09 5:56 ` Oleksij Rempel
2019-01-15 21:54 ` Wolfram Sang
2019-01-09 5:56 ` [PATCH v5 2/2] i2c: imx: improve the error handling in i2c_imx_dma_request() Oleksij Rempel
1 sibling, 1 reply; 5+ messages in thread
From: Oleksij Rempel @ 2019-01-09 5:56 UTC (permalink / raw)
To: Wolfram Sang, Shawn Guo, Sascha Hauer
Cc: Oleksij Rempel, linux-i2c, Pengutronix Kernel Team, Fabio Estevam,
linux-arm-kernel, NXP Linux Team
At least on i.MX5x, the DMA events for I2C and SDHC use the same channel
and there can only be a single user. So in this case there should be no
message emitted that looks like an error if the I2C device doesn't have
an assigned DMA channel. In contrast real problems that were only
emitted at debug level before should be described at a higher level
to be better visible and so understandable.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/i2c/busses/i2c-imx.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index fa9ad53845d9..e28ef494dac8 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -285,9 +285,11 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
if (!dma)
return;
- dma->chan_tx = dma_request_slave_channel(dev, "tx");
- if (!dma->chan_tx) {
- dev_dbg(dev, "can't request DMA tx channel\n");
+ dma->chan_tx = dma_request_chan(dev, "tx");
+ if (IS_ERR(dma->chan_tx)) {
+ ret = PTR_ERR(dma->chan_rx);
+ if (ret != -ENODEV && ret != -EPROBE_DEFER)
+ dev_err(dev, "can't request DMA tx channel (%d)\n", ret);
goto fail_al;
}
@@ -298,13 +300,15 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_sconfig.direction = DMA_MEM_TO_DEV;
ret = dmaengine_slave_config(dma->chan_tx, &dma_sconfig);
if (ret < 0) {
- dev_dbg(dev, "can't configure tx channel\n");
+ dev_err(dev, "can't configure tx channel (%d)\n", ret);
goto fail_tx;
}
- dma->chan_rx = dma_request_slave_channel(dev, "rx");
- if (!dma->chan_rx) {
- dev_dbg(dev, "can't request DMA rx channel\n");
+ 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 (%d)\n", ret);
goto fail_tx;
}
@@ -315,7 +319,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_sconfig.direction = DMA_DEV_TO_MEM;
ret = dmaengine_slave_config(dma->chan_rx, &dma_sconfig);
if (ret < 0) {
- dev_dbg(dev, "can't configure rx channel\n");
+ dev_err(dev, "can't configure rx channel (%d)\n", ret);
goto fail_rx;
}
@@ -332,7 +336,6 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_release_channel(dma->chan_tx);
fail_al:
devm_kfree(dev, dma);
- dev_info(dev, "can't use DMA, using PIO instead.\n");
}
static void i2c_imx_dma_callback(void *arg)
--
2.19.1
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^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v5 2/2] i2c: imx: improve the error handling in i2c_imx_dma_request()
2019-01-09 5:56 [PATCH v5 0/2] i2c: imx: rework imx error handling Oleksij Rempel
2019-01-09 5:56 ` [PATCH v5 1/2] i2c: imx: notify about real errors on dma i2c_imx_dma_request Oleksij Rempel
@ 2019-01-09 5:56 ` Oleksij Rempel
2019-01-15 21:54 ` Wolfram Sang
1 sibling, 1 reply; 5+ messages in thread
From: Oleksij Rempel @ 2019-01-09 5:56 UTC (permalink / raw)
To: Wolfram Sang, Shawn Guo, Sascha Hauer
Cc: Oleksij Rempel, linux-i2c, Pengutronix Kernel Team, Fabio Estevam,
linux-arm-kernel, NXP Linux Team
Improve the error handling in i2c_imx_dma_request() and let it return an error
indication that the caller then can handle accordingly.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/i2c/busses/i2c-imx.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index e28ef494dac8..09b124547669 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -273,8 +273,8 @@ static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx,
}
/* Functions for DMA support */
-static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
- dma_addr_t phy_addr)
+static int i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
+ dma_addr_t phy_addr)
{
struct imx_i2c_dma *dma;
struct dma_slave_config dma_sconfig;
@@ -283,7 +283,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
if (!dma)
- return;
+ return -ENOMEM;
dma->chan_tx = dma_request_chan(dev, "tx");
if (IS_ERR(dma->chan_tx)) {
@@ -328,7 +328,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n",
dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx));
- return;
+ return 0;
fail_rx:
dma_release_channel(dma->chan_rx);
@@ -336,6 +336,8 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_release_channel(dma->chan_tx);
fail_al:
devm_kfree(dev, dma);
+ /* return successfully if there is no dma support */
+ return ret == -ENODEV ? 0 : ret;
}
static void i2c_imx_dma_callback(void *arg)
@@ -1163,11 +1165,13 @@ static int i2c_imx_probe(struct platform_device *pdev)
dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res);
dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
i2c_imx->adapter.name);
- dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
/* Init DMA config if supported */
- i2c_imx_dma_request(i2c_imx, phy_addr);
+ ret = i2c_imx_dma_request(i2c_imx, phy_addr);
+ if (ret < 0)
+ goto clk_notifier_unregister;
+ dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
return 0; /* Return OK */
clk_notifier_unregister:
--
2.19.1
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^ permalink raw reply related [flat|nested] 5+ messages in thread