-stable review patch. If anyone has any objections, please let us know. --------------------- From: Roland Scheidegger The i8042 driver fails detection of the AUX port with some chips, because they apparently do not change the I8042_CTR_AUXDIS bit immediately. This is known to affect at least HP500/HP510 notebooks, consequently the built-in touchpad will not work. The patch will simply reread the value until it gets the expected value or a retry limit is hit, without touching other workaround code in the same area. Signed-off-by: Roland Scheidegger Signed-off-by: Dmitry Torokhov Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman --- X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=d2ada5597d33a9108acb2caf912f85cbc9caab1e drivers/input/serio/i8042.c | 35 +++++++++++++++++++++++++++++------ 1 file changed, 29 insertions(+), 6 deletions(-) --- linux-2.6.21.4.orig/drivers/input/serio/i8042.c +++ linux-2.6.21.4/drivers/input/serio/i8042.c @@ -526,6 +526,33 @@ static irqreturn_t __devinit i8042_aux_t return IRQ_HANDLED; } +/* + * i8042_toggle_aux - enables or disables AUX port on i8042 via command and + * verifies success by readinng CTR. Used when testing for presence of AUX + * port. + */ +static int __devinit i8042_toggle_aux(int on) +{ + unsigned char param; + int i; + + if (i8042_command(¶m, + on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE)) + return -1; + + /* some chips need some time to set the I8042_CTR_AUXDIS bit */ + for (i = 0; i < 100; i++) { + udelay(50); + + if (i8042_command(¶m, I8042_CMD_CTL_RCTR)) + return -1; + + if (!(param & I8042_CTR_AUXDIS) == on) + return 0; + } + + return -1; +} /* * i8042_check_aux() applies as much paranoia as it can at detecting @@ -580,16 +607,12 @@ static int __devinit i8042_check_aux(voi * Bit assignment test - filters out PS/2 i8042's in AT mode */ - if (i8042_command(¶m, I8042_CMD_AUX_DISABLE)) - return -1; - if (i8042_command(¶m, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS)) { + if (i8042_toggle_aux(0)) { printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n"); printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n"); } - if (i8042_command(¶m, I8042_CMD_AUX_ENABLE)) - return -1; - if (i8042_command(¶m, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS)) + if (i8042_toggle_aux(1)) return -1; /* -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/