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 617f98b0cbae47ce9c76265f50590f88a83c187d..713f7986e626700256a406155e3bcbde7a018fda 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);
 }