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Date: Mon, 28 Apr 2014 09:57:45 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
bhelgaas@...gle.com, matthew.garrett@...ula.com,
rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com
Subject: Re: [PATCH V5 08/12] ACPI: introduce dummy lpss scan handler
On Mon, 2014-04-28 at 00:23 +0200, Rafael J. Wysocki wrote:
> On Tuesday, April 08, 2014 12:06:55 AM Zhang Rui wrote:
> > When the lpss scan handler is compiled out, aka, CONFIG_X86_INTEL_LPSS
> > is cleared, those ACPI device objects will be recgonized as regular
> > _HID devices, and a platform device would be created for each of them.
> > This is wrong because the platform drivers for those devices would
> > be loaded, but with broken behavior.
> >
> > In order to fix this, a dummy lpss scan handler is introduced
> > to prevent those platform devices from being created.
> > Plus, if lpt_clk_init() fails, we need this dummy scan handler as well.
> >
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
>
> All of the patches adding dummy scan handlers should go before [7/12] I think.
>
agreed, will do it in next version.
thanks,
rui
> > ---
> > drivers/acpi/Makefile | 2 +-
> > drivers/acpi/acpi_lpss.c | 69 ++++++++++++++++++++++++++++++++--------------
> > drivers/acpi/internal.h | 4 ---
> > 3 files changed, 50 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> > index 9a43893..2173e30 100644
> > --- a/drivers/acpi/Makefile
> > +++ b/drivers/acpi/Makefile
> > @@ -39,7 +39,7 @@ acpi-y += processor_core.o
> > acpi-y += ec.o
> > acpi-$(CONFIG_ACPI_DOCK) += dock.o
> > acpi-y += pci_root.o pci_link.o pci_irq.o
> > -acpi-$(CONFIG_X86_INTEL_LPSS) += acpi_lpss.o
> > +acpi-y += acpi_lpss.o
> > acpi-y += acpi_platform.o
> > acpi-y += acpi_pnp.o
> > acpi-y += power.o
> > diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
> > index 69e29f4..965428f 100644
> > --- a/drivers/acpi/acpi_lpss.c
> > +++ b/drivers/acpi/acpi_lpss.c
> > @@ -24,6 +24,8 @@
> >
> > ACPI_MODULE_NAME("acpi_lpss");
> >
> > +#ifdef CONFIG_X86_INTEL_LPSS
> > +
> > #define LPSS_CLK_SIZE 0x04
> > #define LPSS_LTR_SIZE 0x18
> >
> > @@ -159,40 +161,50 @@ static struct lpss_device_desc byt_i2c_dev_desc = {
> > .shared_clock = &i2c_clock,
> > };
> >
> > +#define LPSS_PTR(desc) ((unsigned long)&desc)
> > +
> > +#else
> > +
> > +#define LPSS_PTR(desc) 0
> > +
> > +#endif
> > +
> > static const struct acpi_device_id acpi_lpss_device_ids[] = {
> > /* Generic LPSS devices */
> > - { "INTL9C60", (unsigned long)&lpss_dma_desc },
> > + { "INTL9C60", LPSS_PTR(lpss_dma_desc) },
> >
> > /* Lynxpoint LPSS devices */
> > - { "INT33C0", (unsigned long)&lpt_dev_desc },
> > - { "INT33C1", (unsigned long)&lpt_dev_desc },
> > - { "INT33C2", (unsigned long)&lpt_dev_desc },
> > - { "INT33C3", (unsigned long)&lpt_dev_desc },
> > - { "INT33C4", (unsigned long)&lpt_uart_dev_desc },
> > - { "INT33C5", (unsigned long)&lpt_uart_dev_desc },
> > - { "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
> > + { "INT33C0", LPSS_PTR(lpt_dev_desc) },
> > + { "INT33C1", LPSS_PTR(lpt_dev_desc) },
> > + { "INT33C2", LPSS_PTR(lpt_dev_desc) },
> > + { "INT33C3", LPSS_PTR(lpt_dev_desc) },
> > + { "INT33C4", LPSS_PTR(lpt_uart_dev_desc) },
> > + { "INT33C5", LPSS_PTR(lpt_uart_dev_desc) },
> > + { "INT33C6", LPSS_PTR(lpt_sdio_dev_desc) },
> > { "INT33C7", },
> >
> > /* BayTrail LPSS devices */
> > - { "80860F09", (unsigned long)&byt_pwm_dev_desc },
> > - { "80860F0A", (unsigned long)&byt_uart_dev_desc },
> > - { "80860F0E", (unsigned long)&byt_spi_dev_desc },
> > - { "80860F14", (unsigned long)&byt_sdio_dev_desc },
> > - { "80860F41", (unsigned long)&byt_i2c_dev_desc },
> > + { "80860F09", LPSS_PTR(byt_pwm_dev_desc) },
> > + { "80860F0A", LPSS_PTR(byt_uart_dev_desc) },
> > + { "80860F0E", LPSS_PTR(byt_spi_dev_desc) },
> > + { "80860F14", LPSS_PTR(byt_sdio_dev_desc) },
> > + { "80860F41", LPSS_PTR(byt_i2c_dev_desc) },
> > { "INT33B2", },
> >
> > - { "INT3430", (unsigned long)&lpt_dev_desc },
> > - { "INT3431", (unsigned long)&lpt_dev_desc },
> > - { "INT3432", (unsigned long)&lpt_dev_desc },
> > - { "INT3433", (unsigned long)&lpt_dev_desc },
> > - { "INT3434", (unsigned long)&lpt_uart_dev_desc },
> > - { "INT3435", (unsigned long)&lpt_uart_dev_desc },
> > - { "INT3436", (unsigned long)&lpt_sdio_dev_desc },
> > + { "INT3430", LPSS_PTR(lpt_dev_desc) },
> > + { "INT3431", LPSS_PTR(lpt_dev_desc) },
> > + { "INT3432", LPSS_PTR(lpt_dev_desc) },
> > + { "INT3433", LPSS_PTR(lpt_dev_desc) },
> > + { "INT3434", LPSS_PTR(lpt_uart_dev_desc) },
> > + { "INT3435", LPSS_PTR(lpt_uart_dev_desc) },
> > + { "INT3436", LPSS_PTR(lpt_sdio_dev_desc) },
> > { "INT3437", },
> >
> > { }
> > };
> >
> > +#ifdef CONFIG_X86_INTEL_LPSS
> > +
> > static int is_memory(struct acpi_resource *res, void *not_used)
> > {
> > struct resource r;
> > @@ -511,10 +523,27 @@ static struct acpi_scan_handler lpss_handler = {
> > .unbind = acpi_lpss_unbind,
> > };
> >
> > +#endif /* CONFIG_X86_INTEL_LPSS */
> > +
> > +static int acpi_lpss_dummy_attach(struct acpi_device *adev,
> > + const struct acpi_device_id *id)
> > +{
> > + return 1;
> > +}
> > +
> > +static struct acpi_scan_handler lpss_dummy_handler = {
> > + .ids = acpi_lpss_device_ids,
> > + .attach = acpi_lpss_dummy_attach,
> > +};
> > +
> > void __init acpi_lpss_init(void)
> > {
> > +#ifdef CONFIG_X86_INTEL_LPSS
> > if (!lpt_clk_init()) {
> > bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
> > acpi_scan_add_handler(&lpss_handler);
> > + return;
> > }
> > +#endif
> > + acpi_scan_add_handler(&lpss_dummy_handler);
> > }
> > diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> > index 3a12866..40ce814 100644
> > --- a/drivers/acpi/internal.h
> > +++ b/drivers/acpi/internal.h
> > @@ -73,11 +73,7 @@ int acpi_debugfs_init(void);
> > #else
> > static inline void acpi_debugfs_init(void) { return; }
> > #endif
> > -#ifdef CONFIG_X86_INTEL_LPSS
> > void acpi_lpss_init(void);
> > -#else
> > -static inline void acpi_lpss_init(void) {}
> > -#endif
> >
> > acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
> > bool acpi_queue_hotplug_work(struct work_struct *work);
> >
>
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