mfd: Keep a cache of WM8350 volatile values

Due to the way that the WM8350 audio driver handles CODEC_ENA many of
the WM8350 audio registers are marked as volatile when they aren't
actually so. Allow the audio driver to see a cache of these values for
inspection during interrupt context.

To do this we need to stop satisfying any bits from volatile registers
from cache - there's no real benefit from doing so anyway, we did the
read already.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c
index c2be308..fe24079 100644 (file)
--- a/drivers/mfd/wm8350-core.c
+++ b/drivers/mfd/wm8350-core.c
@@ -79,10 +79,6 @@ static int wm8350_phys_read(struct wm8350 *wm8350, u8 reg, int num_regs,
                /* Cache is CPU endian */
                dest[i - reg] = be16_to_cpu(dest[i - reg]);
 
-               /* Satisfy non-volatile bits from cache */
-               dest[i - reg] &= wm8350_reg_io_map[i].vol;
-               dest[i - reg] |= wm8350->reg_cache[i];
-
                /* Mask out non-readable bits */
                dest[i - reg] &= wm8350_reg_io_map[i].readable;
        }
@@ -182,9 +178,6 @@ static int wm8350_write(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *src)
                        (wm8350->reg_cache[i] & ~wm8350_reg_io_map[i].writable)
                        | src[i - reg];
 
-               /* Don't store volatile bits */
-               wm8350->reg_cache[i] &= ~wm8350_reg_io_map[i].vol;
-
                src[i - reg] = cpu_to_be16(src[i - reg]);
        }
 
@@ -1261,7 +1254,6 @@ static int wm8350_create_cache(struct wm8350 *wm8350, int type, int mode)
                    (i < WM8350_CLOCK_CONTROL_1 || i > WM8350_AIF_TEST)) {
                        value = be16_to_cpu(wm8350->reg_cache[i]);
                        value &= wm8350_reg_io_map[i].readable;
-                       value &= ~wm8350_reg_io_map[i].vol;
                        wm8350->reg_cache[i] = value;
                } else
                        wm8350->reg_cache[i] = reg_map[i];