2.6.{28,30} Keyboard not working on oldish machine
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Message ID 20090909022718.A177E526EC9@mailhub.coreip.homeip.net
State Accepted
Commit 5ddbc77c3eb54336fcd44b7b66b44784d65677e2
Headers show

Commit Message

Dmitry Torokhov Sept. 9, 2009, 1:53 a.m. UTC
On Mon, Sep 07, 2009 at 11:12:19PM -0700, Dmitry Torokhov wrote:
> On Sun, Sep 06, 2009 at 12:51:59AM +0100, Dr. David Alan Gilbert wrote:
> > * Dmitry Torokhov (dmitry.torokhov@gmail.com) wrote:
> > > On Sun, Jun 28, 2009 at 03:04:52PM +0100, Dr. David Alan Gilbert wrote:
> > > > * Dmitry Torokhov (dmitry.torokhov@gmail.com) wrote:
> > > > > On Tuesday 23 June 2009 11:58:15 Dr. David Alan Gilbert wrote:
> > > > 
> > > > <snip>
> > > >  
> > > > > > Yep; I'm OK with the i8042.noaux from my point of view, but it's a
> > > > > > bit worrying that this used to work fine.  There's obviously been
> > > > > > a change somewhere since 2.6.18 (and as I remember from the dmesg
> > > > > > the keyboard and aux ports are being initialised in different orders).
> > > > > > (Actually I say obviously since 2.6.18 - but the 2.6.18 I tried
> > > > > > I think I only used the debian version - I should go back and
> > > > > > see if I can do a vanilla one), but this box has been running
> > > > > > Linux since the time it was originally bought with loads of distros
> > > > > > and clean kernels years ago.
> > > > > >
> > > > > > While this machine is old, the motherboard was a pretty common one
> > > > > > at the time.
> > > > > >
> > > > > 
> > > > > Any chance I could get dmesg with i8042.debug with 2.6.18? There was
> > > > > quite a large change back then when we got rid of the polling timer
> > > > > in i8042.
> > > > 
> > > > Apologies for the delay; attached is the dmesg from the Debian 2.6.18
> > > > in which keyboard works as previously described.
> > > > 
> > > 
> > > Sorry for taking so long to respond. The only vidible difference beween
> > > the old and the new way is that we don't "close" serio ports anymore if
> > > we fail to detect a mouse/keyboard.
> > > 
> > > Could you please try the patch below and tell me if it helps?
> > 
> > Yes that fixes it - thank you!
> > (Tested on 2.6.31-rc8, having first checked rc8 on it's own was still broken)
> > 
> 
> That is great news! Would you mind testing a slightly modifued version
> of the patch and if it still works I will get it applied.
> 
> Thanks!
> 

Bah, that one was completely screwed up, please try this one instead.

Thanks!

Comments

Dr. David Alan Gilbert Sept. 12, 2009, 3 p.m. UTC | #1
* Dmitry Torokhov (dmitry.torokhov@gmail.com) wrote:

<snip>

> Bah, that one was completely screwed up, please try this one instead.

Yep - that works nicely.  Thanks.

Dave

> 
> Thanks!
> 
> -- 
> Dmitry
> 
> Input: i8042 - try disabling and re-enabling AUX port at close
> 
> From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> 
> Ever since we switched from having a polling timer to registering IRQ
> handlers for both keyboard and AUX ports at the driver registration
> time, on certain boxes probing for a mouse results in keyboard
> stopping working. The only real difference between old and new way is
> that before we disabled ports after unsuccessful probe whereas now we
> leave them as is. Try to emulate the old behavior by disabling and
> immediately re-enabling AUX and KBD ports when corresponding serio
> port is being closed.
> 
> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
> ---
> 
>  drivers/input/serio/i8042.c |   50 ++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 49 insertions(+), 1 deletions(-)
> 
> 
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index b53a015..8aaf8fc 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -264,6 +264,49 @@ static int i8042_aux_write(struct serio *serio, unsigned char c)
>  					I8042_CMD_MUX_SEND + port->mux);
>  }
>  
> +
> +/*
> + * i8042_aux_close attempts to clear AUX or KBD port state by disabling
> + * and then re-enabling it.
> + */
> +
> +static void i8042_port_close(struct serio *serio)
> +{
> +	int irq_bit;
> +	int disable_bit;
> +	const char *port_name;
> +
> +	if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
> +		irq_bit = I8042_CTR_AUXINT;
> +		disable_bit = I8042_CTR_AUXDIS;
> +		port_name = "AUX";
> +	} else {
> +		irq_bit = I8042_CTR_KBDINT;
> +		disable_bit = I8042_CTR_KBDDIS;
> +		port_name = "KBD";
> +	}
> +
> +	i8042_ctr &= ~irq_bit;
> +	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_WARNING
> +			"i8042.c: Can't write CTR while closing %s port.\n",
> +			port_name);
> +
> +	udelay(50);
> +
> +	i8042_ctr &= ~disable_bit;
> +	i8042_ctr |= irq_bit;
> +	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_ERR "i8042.c: Can't reactivate %s port.\n",
> +			port_name);
> +
> +	/*
> +	 * See if there is any data appeared while we were messing with
> +	 * port state.
> +	 */
> +	i8042_interrupt(0, NULL);
> +}
> +
>  /*
>   * i8042_start() is called by serio core when port is about to finish
>   * registering. It will mark port as existing so i8042_interrupt can
> @@ -393,7 +436,7 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
>  }
>  
>  /*
> - * i8042_enable_kbd_port enables keybaord port on chip
> + * i8042_enable_kbd_port enables keyboard port on chip
>   */
>  
>  static int i8042_enable_kbd_port(void)
> @@ -841,6 +884,9 @@ static void i8042_controller_reset(void)
>  	i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
>  	i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
>  
> +	if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_WARNING "i8042.c: Can't write CTR while resetting.\n");
> +
>  /*
>   * Disable MUX mode if present.
>   */
> @@ -1026,6 +1072,7 @@ static int __devinit i8042_create_kbd_port(void)
>  	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
>  	serio->start		= i8042_start;
>  	serio->stop		= i8042_stop;
> +	serio->close		= i8042_port_close;
>  	serio->port_data	= port;
>  	serio->dev.parent	= &i8042_platform_device->dev;
>  	strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
> @@ -1056,6 +1103,7 @@ static int __devinit i8042_create_aux_port(int idx)
>  	if (idx < 0) {
>  		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
>  		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
> +		serio->close = i8042_port_close;
>  	} else {
>  		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
>  		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
> --
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Patch
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diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index b53a015..8aaf8fc 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -264,6 +264,49 @@  static int i8042_aux_write(struct serio *serio, unsigned char c)
 					I8042_CMD_MUX_SEND + port->mux);
 }
 
+
+/*
+ * i8042_aux_close attempts to clear AUX or KBD port state by disabling
+ * and then re-enabling it.
+ */
+
+static void i8042_port_close(struct serio *serio)
+{
+	int irq_bit;
+	int disable_bit;
+	const char *port_name;
+
+	if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
+		irq_bit = I8042_CTR_AUXINT;
+		disable_bit = I8042_CTR_AUXDIS;
+		port_name = "AUX";
+	} else {
+		irq_bit = I8042_CTR_KBDINT;
+		disable_bit = I8042_CTR_KBDDIS;
+		port_name = "KBD";
+	}
+
+	i8042_ctr &= ~irq_bit;
+	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_WARNING
+			"i8042.c: Can't write CTR while closing %s port.\n",
+			port_name);
+
+	udelay(50);
+
+	i8042_ctr &= ~disable_bit;
+	i8042_ctr |= irq_bit;
+	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_ERR "i8042.c: Can't reactivate %s port.\n",
+			port_name);
+
+	/*
+	 * See if there is any data appeared while we were messing with
+	 * port state.
+	 */
+	i8042_interrupt(0, NULL);
+}
+
 /*
  * i8042_start() is called by serio core when port is about to finish
  * registering. It will mark port as existing so i8042_interrupt can
@@ -393,7 +436,7 @@  static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 }
 
 /*
- * i8042_enable_kbd_port enables keybaord port on chip
+ * i8042_enable_kbd_port enables keyboard port on chip
  */
 
 static int i8042_enable_kbd_port(void)
@@ -841,6 +884,9 @@  static void i8042_controller_reset(void)
 	i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
 	i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
 
+	if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_WARNING "i8042.c: Can't write CTR while resetting.\n");
+
 /*
  * Disable MUX mode if present.
  */
@@ -1026,6 +1072,7 @@  static int __devinit i8042_create_kbd_port(void)
 	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
 	serio->start		= i8042_start;
 	serio->stop		= i8042_stop;
+	serio->close		= i8042_port_close;
 	serio->port_data	= port;
 	serio->dev.parent	= &i8042_platform_device->dev;
 	strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
@@ -1056,6 +1103,7 @@  static int __devinit i8042_create_aux_port(int idx)
 	if (idx < 0) {
 		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
 		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
+		serio->close = i8042_port_close;
 	} else {
 		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
 		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);