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x86: apci: Change PM1_CNT register access to RMW

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In enter_acpi_mode() PM1_CNT register is changed to PM1_CNT_SCI_EN
directly without preserving its previous value. Update to change
the register access to read-modify-write (RMW).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Bin Meng 2017-04-21 07:24:42 -07:00
parent bffd798136
commit b208d1915f
1 changed files with 3 additions and 1 deletions
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4
arch/x86/lib/acpi_table.c
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@ -306,6 +306,8 @@ static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
static void enter_acpi_mode(int pm1_cnt)
{
u16 val = inw(pm1_cnt);
/*
* PM1_CNT register bit0 selects the power management event to be
* either an SCI or SMI interrupt. When this bit is set, then power
@ -320,7 +322,7 @@ static void enter_acpi_mode(int pm1_cnt)
* system, and expose ourselves to OSPM as working under ACPI mode
* already, turn this bit on.
*/
outw(PM1_CNT_SCI_EN, pm1_cnt);
outw(val | PM1_CNT_SCI_EN, pm1_cnt);
}
/*