ALSA: lx6464es - fix device communication via command bus

commit a29878553a9a7b4c06f93c7e383527cf014d4ceb upstream.

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/sound/pci/lx6464es/lx_core.c b/sound/pci/lx6464es/lx_core.c
index 3086b751da4a59271b497e1a8605c3664d15a2ff..2313a516fb62b6ac5a0f825e5c570ae37e427d2f 100644 (file)
--- a/sound/pci/lx6464es/lx_core.c
+++ b/sound/pci/lx6464es/lx_core.c
@@ -80,8 +80,12 @@ unsigned long lx_dsp_reg_read(struct lx6464es *chip, int port)
 
 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);
 }
 
 
@@ -94,8 +98,12 @@ void lx_dsp_reg_write(struct lx6464es *chip, int port, unsigned data)
 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);
 }