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authorTim Blechmann <tim@klingt.org>2011-11-22 11:15:45 +0100
committerTakashi Iwai <tiwai@suse.de>2011-11-22 11:53:11 +0100
commita29878553a9a7b4c06f93c7e383527cf014d4ceb (patch)
tree8293c90710effa830249e8fde67472495cff9374 /sound/pci/lx6464es/lx_core.c
parentafd00d7235c1989d06d75cf8ac3d7722fcf2f394 (diff)
downloadlinux-stericsson-a29878553a9a7b4c06f93c7e383527cf014d4ceb.tar.gz
ALSA: lx6464es - fix device communication via command bus
commit 6175ddf06b6172046a329e3abfd9c901a43efd2e optimized the mem*io functions that have been used to send commands to the device. these optimizations somehow corrupted the communication with the lx6464es, that resulted the device to be unusable with kernels after 2.6.33. this patch emulates the memcpy_*_io functions via a loop to avoid these problems. Signed-off-by: Tim Blechmann <tim@klingt.org> LKML-Reference: <4ECB5257.4040600@ladisch.de> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/lx6464es/lx_core.c')
-rw-r--r--sound/pci/lx6464es/lx_core.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/sound/pci/lx6464es/lx_core.c b/sound/pci/lx6464es/lx_core.c
index ad52f4187e40..8c3e7fcefd99 100644
--- a/sound/pci/lx6464es/lx_core.c
+++ b/sound/pci/lx6464es/lx_core.c
@@ -81,8 +81,12 @@ unsigned long lx_dsp_reg_read(struct lx6464es *chip, int port)
static void lx_dsp_reg_readbuf(struct lx6464es *chip, int port, u32 *data,
u32 len)
{
- void __iomem *address = lx_dsp_register(chip, port);
- memcpy_fromio(data, address, len*sizeof(u32));
+ u32 __iomem *address = lx_dsp_register(chip, port);
+ int i;
+
+ /* we cannot use memcpy_fromio */
+ for (i = 0; i != len; ++i)
+ data[i] = ioread32(address + i);
}
@@ -95,8 +99,12 @@ void lx_dsp_reg_write(struct lx6464es *chip, int port, unsigned data)
static void lx_dsp_reg_writebuf(struct lx6464es *chip, int port,
const u32 *data, u32 len)
{
- void __iomem *address = lx_dsp_register(chip, port);
- memcpy_toio(address, data, len*sizeof(u32));
+ u32 __iomem *address = lx_dsp_register(chip, port);
+ int i;
+
+ /* we cannot use memcpy_to */
+ for (i = 0; i != len; ++i)
+ iowrite32(data[i], address + i);
}