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authorStephan Gerhold <stephan@gerhold.net>2019-10-10 17:47:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-12-31 16:44:04 +0100
commit5f5fdf612efb8fc3629d220058dccf5385ecdce3 (patch)
tree7d101539b8045d02b281a24d1bb6166d9c52b74b /drivers/extcon
parent0d93c2907b1aa2f2bffef02d3ef933a8f8524314 (diff)
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>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-sm5502.c4
-rw-r--r--drivers/extcon/extcon-sm5502.h2
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
index dc43847ad2b0..b3d93baf4fc5 100644
--- a/drivers/extcon/extcon-sm5502.c
+++ b/drivers/extcon/extcon-sm5502.c
@@ -65,6 +65,10 @@ 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 9dbb634d213b..ce1f1ec310c4 100644
--- a/drivers/extcon/extcon-sm5502.h
+++ b/drivers/extcon/extcon-sm5502.h
@@ -237,6 +237,8 @@ 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 */