[PATCH] Input: apple_z2: Fix reading incorrect reports after exiting sleep

[Sasha Finkelstein via B4 Relay <devnull+fnkl.kernel.gmail.com@kernel.org>]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

Under certain conditions (more prevalent after a suspend/resume cycle),
the touchscreen controller can send the "boot complete" interrupt before
it actually finished booting. In those cases, attempting to read touch
data resuls in a stream of "not ready" messages being read and
interpreted as a touch report. Check that the response is in fact a
touch report and discard it otherwise.

Reported-by: pitust <piotr@stelmaszek.com>
Closes: https://oftc.catirclogs.org/asahi/2025-12-17#34878715;
Fixes: 471a92f8a21a ("Input: apple_z2 - add a driver for Apple Z2 touchscreens")
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 drivers/input/touchscreen/apple_z2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/input/touchscreen/apple_z2.c b/drivers/input/touchscreen/apple_z2.c
index 0de161eae59a..271ababf0ad5 100644
--- a/drivers/input/touchscreen/apple_z2.c
+++ b/drivers/input/touchscreen/apple_z2.c
@@ -21,6 +21,7 @@
 #define APPLE_Z2_TOUCH_STARTED           3
 #define APPLE_Z2_TOUCH_MOVED             4
 #define APPLE_Z2_CMD_READ_INTERRUPT_DATA 0xEB
+#define APPLE_Z2_REPLY_INTERRUPT_DATA    0xE1
 #define APPLE_Z2_HBPP_CMD_BLOB           0x3001
 #define APPLE_Z2_FW_MAGIC                0x5746325A
 #define LOAD_COMMAND_INIT_PAYLOAD        0
@@ -142,6 +143,9 @@ static int apple_z2_read_packet(struct apple_z2 *z2)
 	if (error)
 		return error;
 
+	if (z2->rx_buf[0] != APPLE_Z2_REPLY_INTERRUPT_DATA)
+		return 0;
+
 	pkt_len = (get_unaligned_le16(z2->rx_buf + 1) + 8) & 0xfffffffc;
 
 	error = spi_read(z2->spidev, z2->rx_buf, pkt_len);

---
base-commit: ea1013c1539270e372fc99854bc6e4d94eaeff66
change-id: 20251217-z2-init-fix-3b14ef4c6890

Best regards,
-- 
Sasha Finkelstein <fnkl.kernel@gmail.com>