extcon: sm5502: Reset registers during initialization

[ Upstream commit 6942635032cfd3e003e980d2dfa4e6323a3ce145 ]

On some devices (e.g. Samsung Galaxy A5 (2015)), the bootloader
seems to keep interrupts enabled for SM5502 when booting Linux.
Changing the cable state (i.e. plugging in a cable) - until the driver
is loaded - will therefore produce an interrupt that is never read.

In this situation, the cable state will be stuck forever on the
initial state because SM5502 stops sending interrupts.
This can be avoided by clearing those pending interrupts after
the driver has been loaded.

One way to do this is to reset all registers to default state
by writing to SM5502_REG_RESET. This ensures that we start from
a clean state, with all interrupts disabled.

Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
index 0cfb5a3efdf65ad3637fc479c45cf53ebc43933c..2efcd94f74fc6bc808344166d711d2181fc2ec50 100644 (file)
--- a/drivers/extcon/extcon-sm5502.c
+++ b/drivers/extcon/extcon-sm5502.c
@@ -69,6 +69,10 @@ struct sm5502_muic_info {
 /* Default value of SM5502 register to bring up MUIC device. */
 static struct reg_data sm5502_reg_data[] = {
        {
+               .reg = SM5502_REG_RESET,
+               .val = SM5502_REG_RESET_MASK,
+               .invert = true,
+       }, {
                .reg = SM5502_REG_CONTROL,
                .val = SM5502_REG_CONTROL_MASK_INT_MASK,
                .invert = false,

diff --git a/drivers/extcon/extcon-sm5502.h b/drivers/extcon/extcon-sm5502.h
index 974b53222f568df3aefcc25c9fe7c732eec7ec4d..12f8b01e575387be81bde88395d7a2f1e57433ac 100644 (file)
--- a/drivers/extcon/extcon-sm5502.h
+++ b/drivers/extcon/extcon-sm5502.h
@@ -241,6 +241,8 @@ enum sm5502_reg {
 #define DM_DP_SWITCH_UART                      ((DM_DP_CON_SWITCH_UART <<SM5502_REG_MANUAL_SW1_DP_SHIFT) \
                                                | (DM_DP_CON_SWITCH_UART <<SM5502_REG_MANUAL_SW1_DM_SHIFT))
 
+#define SM5502_REG_RESET_MASK                  (0x1)
+
 /* SM5502 Interrupts */
 enum sm5502_irq {
        /* INT1 */