extcon: arizona: Additional settings to improve accuracy of HP detect

If the TST_CAP_SEL bits aren't set correctly on wm5110/8280 there will
be a 100k load along side the headphones, which will affect the accurary
towards the very top of the detection range. This patch sets those bits.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index d719ee724651..6d35147b1d6c 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -43,6 +43,9 @@
 #define ARIZONA_MICD_CLAMP_MODE_JDL_GP5H 0x9
 #define ARIZONA_MICD_CLAMP_MODE_JDH_GP5H 0xb
 
+#define ARIZONA_TST_CAP_DEFAULT 0x3
+#define ARIZONA_TST_CAP_CLAMP   0x1
+
 #define ARIZONA_HPDET_MAX 10000
 
 #define HPDET_DEBOUNCE 500
@@ -147,6 +150,7 @@ static void arizona_extcon_hp_clamp(struct arizona_extcon_info *info,
 {
         struct arizona *arizona = info->arizona;
         unsigned int mask = 0, val = 0;
+        unsigned int cap_sel = 0;
         int ret;
 
         switch (arizona->type) {
@@ -154,10 +158,21 @@ static void arizona_extcon_hp_clamp(struct arizona_extcon_info *info,
         case WM8280:
                 mask = ARIZONA_HP1L_SHRTO | ARIZONA_HP1L_FLWR |
                        ARIZONA_HP1L_SHRTI;
-                if (clamp)
+                if (clamp) {
                         val = ARIZONA_HP1L_SHRTO;
-                else
+                        cap_sel = ARIZONA_TST_CAP_CLAMP;
+                } else {
                         val = ARIZONA_HP1L_FLWR | ARIZONA_HP1L_SHRTI;
+                        cap_sel = ARIZONA_TST_CAP_DEFAULT;
+                }
+
+                ret = regmap_update_bits(arizona->regmap,
+                                         ARIZONA_HP_TEST_CTRL_1,
+                                         ARIZONA_HP1_TST_CAP_SEL_MASK,
+                                         cap_sel);
+                if (ret != 0)
+                        dev_warn(arizona->dev,
+                                 "Failed to set TST_CAP_SEL: %d\n", ret);
                 break;
         default:
                 mask = ARIZONA_RMV_SHRT_HP1L;