mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 17:18:59 +00:00
27 lines
1023 B
Diff
27 lines
1023 B
Diff
|
From 01cb60004018afba6e2b60149e4adbbf9e87d90b 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] 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(+)
|
||
|
|
|
||
|
|
--- 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
|
||
|
|
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)
|