[PATCH] Revert "ACPI / SBS: Add 5 us delay to fix SBS hangs on MacBook"

Chris Bainbridge
2015-11-12T19:24:47Z

This reverts commit 3349fb64b2927407017d970dd5c4daf3c5ad69f8.

After commit 8848d20cf09c ("ACPI / SMBus: Fix boot stalls / high CPU
caused by reentrant code") the delay is no longer necessary.

Signed-off-by: Chris Bainbridge <chris.bainbridge@gmail.com>
---
drivers/acpi/sbshc.c | 22 ----------------------
1 file changed, 22 deletions(-)

diff --git a/drivers/acpi/sbshc.c b/drivers/acpi/sbshc.c
index e2900518cf7e..2fa8304171e0 100644
--- a/drivers/acpi/sbshc.c
+++ b/drivers/acpi/sbshc.c
@@ -14,7 +14,6 @@
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
-#include <linux/dmi.h>
#include "sbshc.h"

#define PREFIX "ACPI: "
@@ -89,8 +88,6 @@ enum acpi_smb_offset {
ACPI_SMB_ALARM_DATA = 0x26, /* 2 bytes alarm data */
};

-static bool macbook;
-
static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)
{
return ec_read(hc->offset + address, data);
@@ -121,8 +118,6 @@ static int acpi_smbus_transaction(struct acpi_smb_hc *hc, u8 protocol,

mutex_lock(&hc->lock);
hc->done = false;
- if (macbook)
- udelay(5);
if (smb_hc_read(hc, ACPI_SMB_PROTOCOL, &temp))
goto end;
if (temp) {
@@ -250,29 +245,12 @@ extern int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
acpi_handle handle, acpi_ec_query_func func,
void *data);

-static int macbook_dmi_match(const struct dmi_system_id *d)
-{
- pr_debug("Detected MacBook, enabling workaround\n");
- macbook = true;
- return 0;
-}
-
-static struct dmi_system_id acpi_smbus_dmi_table[] = {
- { macbook_dmi_match, "Apple MacBook", {
- DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
- DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
- },
- { },
-};
-
static int acpi_smbus_hc_add(struct acpi_device *device)
{
int status;
unsigned long long val;
struct acpi_smb_hc *hc;

- dmi_check_system(acpi_smbus_dmi_table);
-
if (!device)
return -EINVAL;

--
2.1.4