[ALSA] opti93x: optimize a register access

Opti9xx drivers
When clearing some bits in a register, don't bother with the bits that
won't be changed anyway.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --git a/sound/isa/opti9xx/opti92x-ad1848.c b/sound/isa/opti9xx/opti92x-ad1848.c
index 411a702..782750d 100644 (file)
--- a/sound/isa/opti9xx/opti92x-ad1848.c
+++ b/sound/isa/opti9xx/opti92x-ad1848.c
@@ -1038,8 +1038,7 @@ static int snd_opti93x_capture_prepare(snd_pcm_substream_t *substream)
 
        chip->c_dma_size = size;
        snd_opti93x_out_mask(chip, OPTi93X_IFACE_CONF,
-               OPTi93X_CAPTURE_ENABLE | OPTi93X_CAPTURE_PIO,
-               (unsigned char)~(OPTi93X_CAPTURE_ENABLE | OPTi93X_CAPTURE_PIO));
+               OPTi93X_CAPTURE_ENABLE | OPTi93X_CAPTURE_PIO, 0);
 
        snd_dma_program(chip->dma2, runtime->dma_addr, size,
                DMA_MODE_READ | DMA_AUTOINIT);