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SubjectRe: [regression, bisected] adb trackpad disappears after suspend to ram
Date
I have tested the patch against v2.6.30 and v2.6.31 and in both cases
the bug is fixed.

Thanks,
Jan

"Rafael J. Wysocki" <rjw@sisk.pl> writes:

> On Wednesday 23 September 2009, Benjamin Herrenschmidt wrote:
>> Allright, I think I nailed it (finally !)
>
> Great, thanks a lot for taking care of this!
>
>> Can everybody try this patch:
>>
>> [PATCH] powerpc/pmac: Fix issues with sleep on some powerbooks
>>
>> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>>
>> Since the change of how interrupts are disabled during suspend,
>> certain PowerBook models started exhibiting various issues during
>> suspend or resume from sleep.
>>
>> I finally tracked it down to the code that runs various "platform"
>> functions (kind of little scripts extracted from the device-tree),
>> which uses our i2c and PMU drivers expecting interrutps to work,
>> and at a time where with the new scheme, they have been disabled.
>>
>> This causes timeouts internally which for some reason results in
>> the PMU being unable to see the trackpad, among other issues, really
>> it depends on the machine. Most of the time, we fail to properly adjust
>> some clocks for suspend/resume so the results are not always
>> predictable.
>>
>> This patch fixes it by using IRQF_TIMER for both the PMU and the I2C
>> interrupts. I prefer doing it this way than moving the call sites since
>> I really want those platform functions to still be called after all
>> drivers (and before sysdevs).
>
> Alternatively, you could introduce a new flag IRQF_NOSUSPEND and use that
> instead of IRQF_TIMER. That would be cleaner than using IRQF_TIMER for
> non-timer interrupts IMHO.
>
>> We also do a slight cleanup to via-pmu.c driver to make sure the
>> ADB autopoll mask is handled correctly when doing bus resets
>>
>> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>> ---
>>
>> diff --git a/arch/powerpc/platforms/powermac/low_i2c.c b/arch/powerpc/platforms/powermac/low_i2c.c
>> index 21226b7..414ca98 100644
>> --- a/arch/powerpc/platforms/powermac/low_i2c.c
>> +++ b/arch/powerpc/platforms/powermac/low_i2c.c
>> @@ -540,8 +540,11 @@ static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
>> /* Make sure IRQ is disabled */
>> kw_write_reg(reg_ier, 0);
>>
>> - /* Request chip interrupt */
>> - if (request_irq(host->irq, kw_i2c_irq, 0, "keywest i2c", host))
>> + /* Request chip interrupt. We set IRQF_TIMER because we don't
>> + * want that interrupt disabled between the 2 passes of driver
>> + * suspend or we'll have issues running the pfuncs
>> + */
>> + if (request_irq(host->irq, kw_i2c_irq, IRQF_TIMER, "keywest i2c", host))
>> host->irq = NO_IRQ;
>>
>> printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n",
>> diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
>> index b40fb9b..6f308a4 100644
>> --- a/drivers/macintosh/via-pmu.c
>> +++ b/drivers/macintosh/via-pmu.c
>> @@ -405,7 +405,11 @@ static int __init via_pmu_start(void)
>> printk(KERN_ERR "via-pmu: can't map interrupt\n");
>> return -ENODEV;
>> }
>> - if (request_irq(irq, via_pmu_interrupt, 0, "VIA-PMU", (void *)0)) {
>> + /* We set IRQF_TIMER because we don't want the interrupt to be disabled
>> + * between the 2 passes of driver suspend, we control our own disabling
>> + * for that one
>> + */
>> + if (request_irq(irq, via_pmu_interrupt, IRQF_TIMER, "VIA-PMU", (void *)0)) {
>> printk(KERN_ERR "via-pmu: can't request irq %d\n", irq);
>> return -ENODEV;
>> }
>> @@ -419,7 +423,7 @@ static int __init via_pmu_start(void)
>> gpio_irq = irq_of_parse_and_map(gpio_node, 0);
>>
>> if (gpio_irq != NO_IRQ) {
>> - if (request_irq(gpio_irq, gpio1_interrupt, 0,
>> + if (request_irq(gpio_irq, gpio1_interrupt, IRQF_TIMER,
>> "GPIO1 ADB", (void *)0))
>> printk(KERN_ERR "pmu: can't get irq %d"
>> " (GPIO1)\n", gpio_irq);
>> @@ -925,8 +929,7 @@ proc_write_options(struct file *file, const char __user *buffer,
>>
>> #ifdef CONFIG_ADB
>> /* Send an ADB command */
>> -static int
>> -pmu_send_request(struct adb_request *req, int sync)
>> +static int pmu_send_request(struct adb_request *req, int sync)
>> {
>> int i, ret;
>>
>> @@ -1005,16 +1008,11 @@ pmu_send_request(struct adb_request *req, int sync)
>> }
>>
>> /* Enable/disable autopolling */
>> -static int
>> -pmu_adb_autopoll(int devs)
>> +static int __pmu_adb_autopoll(int devs)
>> {
>> struct adb_request req;
>>
>> - if ((vias == NULL) || (!pmu_fully_inited) || !pmu_has_adb)
>> - return -ENXIO;
>> -
>> if (devs) {
>> - adb_dev_map = devs;
>> pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
>> adb_dev_map >> 8, adb_dev_map);
>> pmu_adb_flags = 2;
>> @@ -1027,9 +1025,17 @@ pmu_adb_autopoll(int devs)
>> return 0;
>> }
>>
>> +static int pmu_adb_autopoll(int devs)
>> +{
>> + if ((vias == NULL) || (!pmu_fully_inited) || !pmu_has_adb)
>> + return -ENXIO;
>> +
>> + adb_dev_map = devs;
>> + return __pmu_adb_autopoll(devs);
>> +}
>> +
>> /* Reset the ADB bus */
>> -static int
>> -pmu_adb_reset_bus(void)
>> +static int pmu_adb_reset_bus(void)
>> {
>> struct adb_request req;
>> int save_autopoll = adb_dev_map;
>> @@ -1038,13 +1044,13 @@ pmu_adb_reset_bus(void)
>> return -ENXIO;
>>
>> /* anyone got a better idea?? */
>> - pmu_adb_autopoll(0);
>> + __pmu_adb_autopoll(0);
>>
>> - req.nbytes = 5;
>> + req.nbytes = 4;
>> req.done = NULL;
>> req.data[0] = PMU_ADB_CMD;
>> - req.data[1] = 0;
>> - req.data[2] = ADB_BUSRESET;
>> + req.data[1] = ADB_BUSRESET;
>> + req.data[2] = 0;
>> req.data[3] = 0;
>> req.data[4] = 0;
>> req.reply_len = 0;
>> @@ -1056,7 +1062,7 @@ pmu_adb_reset_bus(void)
>> pmu_wait_complete(&req);
>>
>> if (save_autopoll != 0)
>> - pmu_adb_autopoll(save_autopoll);
>> + __pmu_adb_autopoll(save_autopoll);
>>
>> return 0;
>> }
>>
> --
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--
Jan Scholz ____ ____ __ ___
( ___)(_ _) /__\ / __)
Frankfurt Institute for Advanced Studies )__) _)(_ /(__)\ \__ \
(__) (____)(__)(__)(___/
Goethe Universitaet Frankfurt
Ruth-Moufang-Str. 1 Tel. 069-798-47534
60438 Frankfurt am Main


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