mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-02-15 04:42:02 +00:00
31 lines
1.2 KiB
Diff
31 lines
1.2 KiB
Diff
From a4c9c85da2fe26bebf940449d475724e7e9c4561 Mon Sep 17 00:00:00 2001
|
|
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
Date: Tue, 10 Nov 2020 11:21:56 +0000
|
|
Subject: [PATCH 332/634] drm/panel/raspberrypi-ts: Insert delay before polling
|
|
for startup state
|
|
|
|
In switching to the hardware I2C controller there is an issue
|
|
where we seem to not get back the correct state from the Pi
|
|
touchscreen.
|
|
Insert a delay before polling to avoid this condition.
|
|
|
|
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
---
|
|
drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 1 +
|
|
1 file changed, 1 insertion(+)
|
|
|
|
diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
|
|
index c5621f07158e..07013bfddf42 100644
|
|
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
|
|
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
|
|
@@ -299,6 +299,7 @@ static int rpi_touchscreen_enable(struct drm_panel *panel)
|
|
int i;
|
|
|
|
rpi_touchscreen_i2c_write(ts, REG_POWERON, 1);
|
|
+ usleep_range(20000, 25000);
|
|
/* Wait for nPWRDWN to go low to indicate poweron is done. */
|
|
for (i = 0; i < 100; i++) {
|
|
if (rpi_touchscreen_i2c_read(ts, REG_PORTB) & 1)
|
|
--
|
|
2.33.1
|
|
|