This is a note to let you know that I've just added the patch titled
can: m_can: Call the RAM init directly from m_can_chip_config
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-m_can-call-the-ram-init-directly-from-m_can_chip.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d8332c62dbcb87905c3537b1557e275afd169789
Author: Vivek Yadav <vivek.2311@xxxxxxxxxxx>
Date: Wed Dec 7 15:36:31 2022 +0530
can: m_can: Call the RAM init directly from m_can_chip_config
[ Upstream commit eaacfeaca7ad0804b9a6eff7afeba93a87db7638 ]
When we try to access the mcan message ram addresses during the probe,
hclk is gated by any other drivers or disabled, because of that probe
gets failed.
Move the mram init functionality to mcan chip config called by
m_can_start from mcan open function, by that time clocks are
enabled.
Suggested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Vivek Yadav <vivek.2311@xxxxxxxxxxx>
Link: https://lore.kernel.org/all/20221207100632.96200-2-vivek.2311@xxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Stable-dep-of: 67727a17a6b3 ("can: tcan4x5x: Fix use of register error status mask")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 153d8fd08bd8..a562f36a99f8 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1233,10 +1233,17 @@ static int m_can_set_bittiming(struct net_device *dev)
* - setup bittiming
* - configure timestamp generation
*/
-static void m_can_chip_config(struct net_device *dev)
+static int m_can_chip_config(struct net_device *dev)
{
struct m_can_classdev *cdev = netdev_priv(dev);
u32 cccr, test;
+ int err;
+
+ err = m_can_init_ram(cdev);
+ if (err) {
+ dev_err(cdev->dev, "Message RAM configuration failed\n");
+ return err;
+ }
m_can_config_endisable(cdev, true);
@@ -1360,18 +1367,25 @@ static void m_can_chip_config(struct net_device *dev)
if (cdev->ops->init)
cdev->ops->init(cdev);
+
+ return 0;
}
-static void m_can_start(struct net_device *dev)
+static int m_can_start(struct net_device *dev)
{
struct m_can_classdev *cdev = netdev_priv(dev);
+ int ret;
/* basic m_can configuration */
- m_can_chip_config(dev);
+ ret = m_can_chip_config(dev);
+ if (ret)
+ return ret;
cdev->can.state = CAN_STATE_ERROR_ACTIVE;
m_can_enable_all_interrupts(cdev);
+
+ return 0;
}
static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
@@ -1800,7 +1814,9 @@ static int m_can_open(struct net_device *dev)
}
/* start the m_can controller */
- m_can_start(dev);
+ err = m_can_start(dev);
+ if (err)
+ goto exit_irq_fail;
if (!cdev->is_peripheral)
napi_enable(&cdev->napi);
@@ -2059,9 +2075,13 @@ int m_can_class_resume(struct device *dev)
ret = m_can_clk_start(cdev);
if (ret)
return ret;
+ ret = m_can_start(ndev);
+ if (ret) {
+ m_can_clk_stop(cdev);
+
+ return ret;
+ }
- m_can_init_ram(cdev);
- m_can_start(ndev);
netif_device_attach(ndev);
netif_start_queue(ndev);
}
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index eee47bad0592..de6d8e01bf2e 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -140,10 +140,6 @@ static int m_can_plat_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, mcan_class);
- ret = m_can_init_ram(mcan_class);
- if (ret)
- goto probe_fail;
-
pm_runtime_enable(mcan_class->dev);
ret = m_can_class_register(mcan_class);
if (ret)
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 1fec394b3517..a77f4d4f6299 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -229,11 +229,6 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
if (ret)
return ret;
- /* Zero out the MCAN buffers */
- ret = m_can_init_ram(cdev);
- if (ret)
- return ret;
-
ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL);
if (ret)
