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authorBjorn Helgaas <bjorn.helgaas@hp.com>2007-06-27 17:09:52 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-28 14:34:53 -0400
commit172d0496cd22c98ee2e4238821fa309c01685f3a (patch)
tree93f3be97047e4adcb3c1b87a9bd0f29aae80f50c /drivers/pnp
parent7c31d2f59c14191c3251f18ad1782fe6692f0c33 (diff)
PNP SMCf010 quirk: auto-config device if BIOS left it broken
Some HP firmware leaves the SMCf010 IRDA device incompletely configured, or reports the wrong resources in _CRS. As a workaround, when we find such a device, try to auto-configure the device. This ignores the _CRS data, picks a config from _PRS, and runs _SRS to configure the device. This makes smsc-ircc2 work correctly with PNP resources (with no preconfiguration!) on all the machines I tested. I think Windows does something like this by default for all devices, so we should consider doing the same thing in Linux. This patch addresses part of the 2.6.22 regression: "no irda0 interface (2.6.21 was OK), smsc does not find chip" It fixes smsc-ircc2 PNP device detection on HP nc6000, nc6220, nw8000, nw8240, and possibly other machines. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Samuel Ortiz <samuel@sortiz.org> Cc: "Linus Walleij (LD/EAB)" <linus.walleij@ericsson.com> Cc: Andrey Borzenkov <arvidjaar@mail.ru> Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Cc: Adam Belay <ambx1@neo.rr.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/pnp')
-rw-r--r--drivers/pnp/quirks.c66
1 files changed, 48 insertions, 18 deletions
diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 277df50c89ae..967a8e22b2da 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -107,31 +107,61 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
107 return; 107 return;
108} 108}
109 109
110static void quirk_smc_enable(struct pnp_dev *dev) 110static int quirk_smc_fir_enabled(struct pnp_dev *dev)
111{ 111{
112 unsigned int firbase; 112 unsigned long firbase;
113 u8 bank, high, low, chip;
114
115 if (!pnp_port_valid(dev, 1))
116 return 0;
117
118 firbase = pnp_port_start(dev, 1);
119
120 /* Select register bank 3 */
121 bank = inb(firbase + 7);
122 bank &= 0xf0;
123 bank |= 3;
124 outb(bank, firbase + 7);
125
126 high = inb(firbase + 0);
127 low = inb(firbase + 1);
128 chip = inb(firbase + 2);
129
130 /* This corresponds to the check in smsc_ircc_present() */
131 if (high == 0x10 && low == 0xb8 && (chip == 0xf1 || chip == 0xf2))
132 return 1;
133
134 return 0;
135}
113 136
114 if (!dev->active || !pnp_port_valid(dev, 1)) 137static void quirk_smc_enable(struct pnp_dev *dev)
138{
139 /*
140 * If the BIOS left the device disabled, or it is enabled and
141 * responding correctly, we're in good shape.
142 */
143 if (!dev->active || quirk_smc_fir_enabled(dev))
115 return; 144 return;
116 145
117 /* 146 /*
118 * On the HP/Compaq nw8240 (and probably other similar machines), 147 * Sometimes the BIOS claims the device is enabled, but it reports
119 * there is an SMCF010 device with two I/O port regions: 148 * the wrong FIR resources or doesn't properly configure ISA or LPC
120 * 149 * bridges on the way to the device.
121 * 0x3e8-0x3ef SIR
122 * 0x100-0x10f FIR
123 * 150 *
124 * _STA reports the device is enabled, but in fact, the BIOS 151 * HP nc6000 and nc8000/nw8000 laptops have known problems like
125 * neglects to enable the FIR range. Fortunately, it does fully 152 * this. Fortunately, they do fix things up if we auto-configure
126 * enable the device if we call _SRS. 153 * the device using its _PRS and _SRS methods.
127 */ 154 */
128 firbase = pnp_port_start(dev, 1); 155 dev_err(&dev->dev, "%s device not responding, auto-configuring "
129 if (inb(firbase + 0x7 /* IRCC_MASTER */) == 0xff) { 156 "resources\n", dev->id->id);
130 pnp_err("%s (%s) enabled but not responding, disabling and " 157
131 "re-enabling", dev->dev.bus_id, pnp_dev_name(dev)); 158 pnp_disable_dev(dev);
132 pnp_disable_dev(dev); 159 pnp_init_resource_table(&dev->res);
133 pnp_activate_dev(dev); 160 pnp_auto_config_dev(dev);
134 } 161 pnp_activate_dev(dev);
162
163 if (!quirk_smc_fir_enabled(dev))
164 dev_err(&dev->dev, "giving up; try \"smsc-ircc2.nopnp\"\n");
135} 165}
136 166
137 167