input: touchscreen: stm: resolve flushFIFO() failed with messy events

Somehow there is the corner case will fill fifo with coordinate events
by palm or intentional trick. Therefore, add fts_system_reset() to back
touch IC original state before flushFIFO() will eliminate this error.

Error logs:
[17304.432940] [ FTS ] fts_mode_handler: Sense OFF!
[17304.433165] [ FTS ] writeSysCmd: Command = A4 00 01
[17304.433172] [ FTS ] writeSysCmd: Writing Sys command...
[17304.442835] [ FTS ] READ EVENT = 23 11 00 D3 68 2A A4 00
[17304.462823] [ FTS ] READ EVENT = 27 11 FB D2 67 35 49 01
[17304.463047] [ FTS ] READ EVENT = 43 09 00 01 0B 00 00 00
(repeated...)
[17309.422950] [ FTS ] READ EVENT = 27 11 CA 82 5F 31 79 00
[17309.432665] [ FTS ] pollForEvent: ERROR 80000007
[17309.432691] [ FTS ] checkEcho: Echo Event not found! ERROR 80000007
[17309.435183] [ FTS ] READ EVENT = 27 11 CE E2 63 36 79 00
[17309.442940] [ FTS ] READ EVENT = 27 11 D7 02 68 36 7A 00
[17309.452998] [ FTS ] READ EVENT = 27 11 E1 92 6B 36 7A 00
(repeated...)
[17314.403044] [ FTS ] READ EVENT = 27 01 18 73 5C 43 8F 00
[17314.413038] [ FTS ] READ EVENT = 27 01 08 03 5A 45 8F 00
[17314.423336] [ FTS ] READ EVENT = 27 01 E0 F2 56 3F 8E 00
[17314.433094] [ FTS ] pollForEvent: ERROR 80000007
[17314.433120] [ FTS ] checkEcho: Echo Event not found! ERROR 80000007
[17314.435619] [ FTS ] READ EVENT = 27 01 9B 12 53 38 8E 01
[17314.436020] [ FTS ] READ EVENT = 27 01 45 D2 4E 31 8D 00
[17314.446245] [ FTS ] READ EVENT = 27 01 EA A1 4A 27 2B 00
(repeated...)
[17319.532793] [ FTS ] READ EVENT = 27 01 E9 41 4A 40 9C 00
[17319.546992] [ FTS ] READ EVENT = 2B 01 20 A2 4D 5D 02 01
[17319.547173] [ FTS ] READ EVENT = 2B 01 44 E2 4F 6C 02 00
[17319.555906] [ FTS ] pollForEvent: ERROR 80000007
[17319.555917] [ FTS ] checkEcho: Echo Event not found! ERROR 80000007
[17319.557926] [ FTS ] fts_writeFwCmd: check echo ERROR 800E0007
[17319.557934] [ FTS ] writeSysCmd: ERROR 800E0007
[17319.557941] [ FTS ] flushFIFO: ERROR 800E0007

Bug: 134185999
Change-Id: Ide67ce1f5f360d72437ba07f983ba71513f309bd
Signed-off-by: Super Liu <supercjliu@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fts.c b/fts.c
index d8f9fa4..7dd5870 100644
--- a/fts.c
+++ b/fts.c
@@ -4679,6 +4679,7 @@ static void fts_suspend_work(struct work_struct *work)
 	fts_enableInterrupt(false);
 
 	/* Flush any outstanding touch events */
+	fts_system_reset();
 	flushFIFO();
 
 	fts_set_switch_gpio(info, FTS_SWITCH_GPIO_VALUE_SLPI_MASTER);