[PATCH v4 3/6] Input: synaptics - Query min dimensions for fw v8.1

[Benjamin Tissoires <benjamin.tissoires@redhat.com>]

From: Daniel Martin <consume.noise@gmail.com>

Query the min dimensions even if the check
    SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7
fails, but we know that the firmware version 8.1 is safe.

With that we don't need quirks for post-2013 models anymore as they
expose correct min and max dimensions.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=91541

Cc: stable@vger.kernel.org
Signed-off-by: Daniel Martin <consume.noise@gmail.com>
  re-order the tests to check SYN_CAP_MIN_DIMENSIONS even on FW 8.1
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
v2: Don't use a list for safe firmwares.

 drivers/input/mouse/synaptics.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 0485e6b..19dc87f 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -372,8 +372,13 @@ static int synaptics_resolution(struct psmouse *psmouse)
 		}
 	}
 
-	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 &&
-	    SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c)) {
+	if (SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c) &&
+	    (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 ||
+	     /* Firmware v8.1 doesn't stand the previous checks, though has
+	      * been proven to report correct min coordinates.
+	      *     https://bugzilla.kernel.org/show_bug.cgi?id=91541 */
+	     (SYN_ID_MAJOR(priv->identity) == 8 &&
+	      SYN_ID_MINOR(priv->identity) == 1))) {
 		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MIN_COORDS, resp)) {
 			psmouse_warn(psmouse,
 				     "device claims to have min coordinates query, but I'm not able to read it.\n");
-- 
2.1.0