2021-08-21 08:54:34 +00:00
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From 01cb60004018afba6e2b60149e4adbbf9e87d90b Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Tue, 10 Nov 2020 11:21:56 +0000
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Subject: [PATCH] drm/panel/raspberrypi-ts: Insert delay before polling
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for startup state
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In switching to the hardware I2C controller there is an issue
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where we seem to not get back the correct state from the Pi
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touchscreen.
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Insert a delay before polling to avoid this condition.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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2022-04-27 18:14:45 +00:00
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@@ -299,6 +299,7 @@ static int rpi_touchscreen_prepare(struc
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2021-08-21 08:54:34 +00:00
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int i;
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rpi_touchscreen_i2c_write(ts, REG_POWERON, 1);
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+ usleep_range(20000, 25000);
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/* Wait for nPWRDWN to go low to indicate poweron is done. */
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for (i = 0; i < 100; i++) {
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if (rpi_touchscreen_i2c_read(ts, REG_PORTB) & 1)
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