[tip:x86/urgent] Input: i8042 - Trust firmware a bit more when probing on X86

[tip-bot for Dmitry Torokhov]

Commit-ID:  d79e141c1c6ea7cb70c169971d522b88c8d5b419
Gitweb:     http://git.kernel.org/tip/d79e141c1c6ea7cb70c169971d522b88c8d5b419
Author:     Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
AuthorDate: Fri, 9 Dec 2016 12:57:39 -0800
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 19 Dec 2016 11:34:15 +0100

Input: i8042 - Trust firmware a bit more when probing on X86

The error message "Can't read CTR while initializing i8042" appears on
Cherry Trail-based devices at each boot time:

  i8042: PNP: No PS/2 controller found. Probing ports directly.
  i8042: Can't read CTR while initializing i8042
  i8042: probe of i8042 failed with error -5

This happens because we historically do not trust firmware on X86 and,
while noting that PNP does not show keyboard or mouse devices, we still
charge ahead and try to probe the controller. Let's relax this a bit and if
results of PNP probe agree with the results of platform
initialization/quirks conclude that there is, in fact, no i8042.

While at it, let's avoid using x86_platform.i8042_detect() and instead
abort execution early if platform indicates that it can not possibly have
i8042 (x86_platform.legacy.i8042 equals X86_LEGACY_I8042_PLATFORM_ABSENT).

Reported-and-tested-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Acked-by: Marcos Paulo de Souza <marcos.souza.org@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1481317061-31486-3-git-send-email-dmitry.torokhov@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 drivers/input/serio/i8042-x86ia64io.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 73a4e68..77551f5 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -983,7 +983,11 @@ static int __init i8042_pnp_init(void)
 #if defined(__ia64__)
 		return -ENODEV;
 #else
-		pr_info("PNP: No PS/2 controller found. Probing ports directly.\n");
+		pr_info("PNP: No PS/2 controller found.\n");
+		if (x86_platform.legacy.i8042 !=
+				X86_LEGACY_I8042_EXPECTED_PRESENT)
+			return -ENODEV;
+		pr_info("Probing ports directly.\n");
 		return 0;
 #endif
 	}
@@ -1070,8 +1074,8 @@ static int __init i8042_platform_init(void)
 
 #ifdef CONFIG_X86
 	u8 a20_on = 0xdf;
-	/* Just return if pre-detection shows no i8042 controller exist */
-	if (!x86_platform.i8042_detect())
+	/* Just return if platform does not have i8042 controller */
+	if (x86_platform.legacy.i8042 == X86_LEGACY_I8042_PLATFORM_ABSENT)
 		return -ENODEV;
 #endif