ALSA: ctxfi - Fix microphone boost codes/comments

microphone boost was set at +12dB, not +20dB (like in Windows driver
and in adc_conf structure declaration), some comments added.

Signed-off-by: Przemyslaw Bruski <pbruskispam@op.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 18 insertions, 10 deletions

diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index b6b11bfe7574..5364164674e4 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -1307,10 +1307,10 @@ static int hw_pll_init(struct hw *hw, unsigned int rsr)
         set_field(&pllctl, PLLCTL_B, 0);
         if (48000 == rsr) {
                 set_field(&pllctl, PLLCTL_FD, 16 - 2);
-                set_field(&pllctl, PLLCTL_RD, 1 - 1);
+                set_field(&pllctl, PLLCTL_RD, 1 - 1); /* 3000*16/1 = 48000 */
         } else { /* 44100 */
                 set_field(&pllctl, PLLCTL_FD, 147 - 2);
-                set_field(&pllctl, PLLCTL_RD, 10 - 1);
+                set_field(&pllctl, PLLCTL_RD, 10 - 1); /* 3000*147/10 = 44100 */
         }
         hw_write_20kx(hw, PLL_CTL, pllctl);
         mdelay(40);
@@ -1740,6 +1740,10 @@ static int hw_is_adc_input_selected(struct hw *hw, enum ADCSRC type)
         return data;
 }
 
+#define MIC_BOOST_0DB 0xCF
+#define MIC_BOOST_STEPS_PER_DB 2
+#define MIC_BOOST_20DB (MIC_BOOST_0DB + 20 * MIC_BOOST_STEPS_PER_DB)
+
 static int hw_adc_input_select(struct hw *hw, enum ADCSRC type)
 {
         u32 data;
@@ -1751,10 +1755,12 @@ static int hw_adc_input_select(struct hw *hw, enum ADCSRC type)
                 hw_write_20kx(hw, GPIO_DATA, data);
                 hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_ADCMC, 0x101),
                                 MAKE_WM8775_DATA(0x101)); /* Mic-in */
-                hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_AADCL, 0xE7),
-                                MAKE_WM8775_DATA(0xE7)); /* +12dB boost */
-                hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_AADCR, 0xE7),
-                                MAKE_WM8775_DATA(0xE7)); /* +12dB boost */
+                hw20k2_i2c_write(hw,
+                                MAKE_WM8775_ADDR(WM8775_AADCL, MIC_BOOST_20DB),
+                                MAKE_WM8775_DATA(MIC_BOOST_20DB)); /* +20dB */
+                hw20k2_i2c_write(hw,
+                                MAKE_WM8775_ADDR(WM8775_AADCR, MIC_BOOST_20DB),
+                                MAKE_WM8775_DATA(MIC_BOOST_20DB)); /* +20dB */
                 break;
         case ADC_LINEIN:
                 data &= ~(0x1 << 14);
@@ -1827,10 +1833,12 @@ static int hw_adc_init(struct hw *hw, const struct adc_conf *info)
 
                 hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_ADCMC, 0x101),
                                 MAKE_WM8775_DATA(0x101)); /* Mic-in */
-                hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_AADCL, 0xE7),
-                                MAKE_WM8775_DATA(0xE7)); /* +12dB boost */
-                hw20k2_i2c_write(hw, MAKE_WM8775_ADDR(WM8775_AADCR, 0xE7),
-                                MAKE_WM8775_DATA(0xE7)); /* +12dB boost */
+                hw20k2_i2c_write(hw,
+                                MAKE_WM8775_ADDR(WM8775_AADCL, MIC_BOOST_20DB),
+                                MAKE_WM8775_DATA(MIC_BOOST_20DB)); /* +20dB */
+                hw20k2_i2c_write(hw,
+                                MAKE_WM8775_ADDR(WM8775_AADCR, MIC_BOOST_20DB),
+                                MAKE_WM8775_DATA(MIC_BOOST_20DB)); /* +20dB */
         } else if (mux == 2) {
                 /* Configures GPIO data to select Line-in */
                 data &= ~(0x1 << 14);