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-rw-r--r--target/linux/brcm2708/patches-4.19/950-0700-Fix-poll-rate-on-touchscreen-3238.patch29
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0700-Fix-poll-rate-on-touchscreen-3238.patch b/target/linux/brcm2708/patches-4.19/950-0700-Fix-poll-rate-on-touchscreen-3238.patch
new file mode 100644
index 0000000000..b47c8190fc
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0700-Fix-poll-rate-on-touchscreen-3238.patch
@@ -0,0 +1,29 @@
+From a37a706547897d77b3194fc507b2546197def430 Mon Sep 17 00:00:00 2001
+From: James Hughes <JamesH65@users.noreply.github.com>
+Date: Tue, 17 Sep 2019 16:22:09 +0100
+Subject: [PATCH] Fix poll rate on touchscreen (#3238)
+
+Was running at 25Hz, rather than he expected 60. Only been doing it
+for the last 5 years....
+
+Replace msleep_interruptible with usleep_range as the msleep call
+is not accurate for times < 20ms.
+
+Fixes: https://github.com/raspberrypi/linux/issues/3227
+
+Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
+---
+ drivers/input/touchscreen/rpi-ft5406.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/input/touchscreen/rpi-ft5406.c
++++ b/drivers/input/touchscreen/rpi-ft5406.c
+@@ -78,7 +78,7 @@ static int ft5406_thread(void *arg)
+
+ while (!kthread_should_stop()) {
+ /* 60fps polling */
+- msleep_interruptible(17);
++ usleep_range(16600, 16700);
+ memcpy_fromio(&regs, ts->ts_base, sizeof(struct ft5406_regs));
+ iowrite8(99,
+ ts->ts_base +