Commit 84a40626 authored Jan 17, 2020 by Johan Korsnes Committed by Jiri Kosina Feb 12, 2020

HID: core: increase HID report buffer size to 8KiB



We have a HID touch device that reports its opens and shorts test
results in HID buffers of size 8184 bytes. The maximum size of the HID
buffer is currently set to 4096 bytes, causing probe of this device to
fail. With this patch we increase the maximum size of the HID buffer to
8192 bytes, making device probe and acquisition of said buffers succeed.

Signed-off-by: Johan Korsnes <jkorsnes@cisco.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Armando Visconti <armando.visconti@st.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

parent 5ebdffd2

include/linux/hid.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -492,7 +492,7 @@ struct hid_report_enum {
		};

		#define HID_MIN_BUFFER_SIZE 64 /* make sure there is at least a packet size of space */
		#define HID_MAX_BUFFER_SIZE 4096 /* 4kb */
		#define HID_MAX_BUFFER_SIZE 8192 /* 8kb */
		#define HID_CONTROL_FIFO_SIZE 256 /* to init devices with >100 reports */
		#define HID_OUTPUT_FIFO_SIZE 64

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