linux-kernel - [PATCH 3/3] ads7846: don't check penirq immediately for 7845

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Date:   Thu, 14 Jul 2022 10:43:19 +0200
From:   Luca Ellero <luca.ellero@...ckedbrain.com>
To:     dmitry.torokhov@...il.com, daniel@...que.org,
        m.felsch@...gutronix.de, andriy.shevchenko@...ux.intel.com,
        u.kleine-koenig@...gutronix.de, mkl@...gutronix.de,
        miquel.raynal@...tlin.com, imre.deak@...ia.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luca Ellero <l.ellero@...m.it>
Subject: [PATCH 3/3] ads7846: don't check penirq immediately for 7845

From: Luca Ellero <l.ellero@...m.it>

To discard false readings, one should use "ti,penirq-recheck-delay-usecs".
Checking get_pendown_state() at the beginning, most of the time fails
causing malfunctioning.

Signed-off-by: Luca Ellero <l.ellero@...m.it>
---
 drivers/input/touchscreen/ads7846.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 9e15cdf6faa0..122d3a13b7c5 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -843,14 +843,8 @@ static void ads7846_report_state(struct ads7846 *ts)
 	if (x == MAX_12BIT)
 		x = 0;
 
-	if (ts->model == 7843) {
+	if (ts->model == 7843 || ts->model == 7845) {
 		Rt = ts->pressure_max / 2;
-	} else if (ts->model == 7845) {
-		if (get_pendown_state(ts))
-			Rt = ts->pressure_max / 2;
-		else
-			Rt = 0;
-		dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt);
 	} else if (likely(x && z1)) {
 		/* compute touch pressure resistance using equation #2 */
 		Rt = z2;
-- 
2.25.1