diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0383-drm-panel-raspberrypi-ts-Insert-delay-before-polling.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0383-drm-panel-raspberrypi-ts-Insert-delay-before-polling.patch | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0383-drm-panel-raspberrypi-ts-Insert-delay-before-polling.patch b/target/linux/bcm27xx/patches-5.10/950-0383-drm-panel-raspberrypi-ts-Insert-delay-before-polling.patch new file mode 100644 index 0000000000..ce838a6114 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0383-drm-panel-raspberrypi-ts-Insert-delay-before-polling.patch @@ -0,0 +1,26 @@ +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) |