lkml.org 
[lkml]   [2020]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 02/18] mfd: mfd-core: Don't overwrite the dma_mask of the child device
Date
Commit cdfee5623290 ("driver core: initialize a default DMA mask for
platform device") initialize the DMA of a platform device. But if the
parent doesn't have a dma_mask set, for example if it's an I2C device,
the dma_mask of the child platform device will be set to zero again.
Which leads to many "DMA mask not set" warnings, if the MFD cell has the
of_compatible property set.

[ 1.877937] sl28cpld-pwm sl28cpld-pwm: DMA mask not set
[ 1.883282] sl28cpld-pwm sl28cpld-pwm.0: DMA mask not set
[ 1.888795] sl28cpld-gpio sl28cpld-gpio: DMA mask not set

Thus don't overwrite the dma_mask of the children. Instead set the
dma_mask of the platform device.

Signed-off-by: Michael Walle <michael@walle.cc>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/mfd/mfd-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index f5a73af60dd4..e735565969b3 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -138,7 +138,7 @@ static int mfd_add_device(struct device *parent, int id,

pdev->dev.parent = parent;
pdev->dev.type = &mfd_dev_type;
- pdev->dev.dma_mask = parent->dma_mask;
+ pdev->platform_dma_mask = parent->dma_mask ? *parent->dma_mask : 0;
pdev->dev.dma_parms = parent->dma_parms;
pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;

--
2.20.1
\
 
 \ /
  Last update: 2020-03-17 21:52    [W:0.208 / U:0.752 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site