linux-kernel - [PATCH 3.16 126/204] Input: ti_am335x_tsc - fix incorrect step config for 5 wire touchscreen

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Jeff Lance" <j-lance1@...com>,
        "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        "Michael Nazzareno Trimarchi" <michael@...rulasolutions.com>,
        "Vignesh R" <vigneshr@...com>
Subject: [PATCH 3.16 126/204] Input: ti_am335x_tsc - fix incorrect step
 config for 5 wire touchscreen

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Lance <j-lance1@...com>

commit cf5dd48907bebaefdb43a8ca079be77e8da2cb20 upstream.

Step config setting for 5 wire touchscreen is incorrect for Y coordinates.
It was broken while we moved to DT. If you look close at the offending
commit bb76dc09ddfc ("input: ti_am33x_tsc: Order of TSC wires, made
configurable"), the change was:

- STEPCONFIG_XNP | STEPCONFIG_YPN;
+ ts_dev->bit_xn | ts_dev->bit_yp;

while bit_xn = STEPCONFIG_XNN and bit_yp = STEPCONFIG_YNN. Not quite the
same.

Fixes: bb76dc09ddfc ("input: ti_am33x_tsc: Order of TSC wires, made configurable")
Signed-off-by: Jeff Lance <j-lance1@...com>
[vigneshr@...com: Rebase to v4.14-rc1]
Signed-off-by: Vignesh R <vigneshr@...com>
Reviewed-by: Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/input/touchscreen/ti_am335x_tsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -157,7 +157,7 @@ static void titsc_step_config(struct tit
 		break;
 	case 5:
 		config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 |
-				ts_dev->bit_xn | ts_dev->bit_yp;
+				STEPCONFIG_XNP | STEPCONFIG_YPN;
 		break;
 	case 8:
 		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);