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platform/x86/amd: pmc: Add an extra STB message for checking s2idle entry

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The `check` callback is run right before the cores are put into HLT.
This will allow checking synchronization problems with other software
that writes into the STB.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220829162953.5947-5-mario.limonciello@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mario Limonciello 2022-08-29 11:29:52 -05:00 committed by Hans de Goede
parent 90bec2855c
commit db55fb8a06
1 changed files with 12 additions and 0 deletions
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12
drivers/platform/x86/amd/pmc.c
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@ -41,6 +41,7 @@
#define AMD_PMC_STB_PMI_0 0x03E30600
#define AMD_PMC_STB_S2IDLE_PREPARE 0xC6000001
#define AMD_PMC_STB_S2IDLE_RESTORE 0xC6000002
#define AMD_PMC_STB_S2IDLE_CHECK 0xC6000003
/* STB S2D(Spill to DRAM) has different message port offset */
#define STB_SPILL_TO_DRAM 0xBE
@ -706,6 +707,16 @@ static void amd_pmc_s2idle_prepare(void)
dev_err(pdev->dev, "error writing to STB: %d\n", rc);
}
static void amd_pmc_s2idle_check(void)
{
struct amd_pmc_dev *pdev = &pmc;
int rc;
rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_S2IDLE_CHECK);
if (rc)
dev_err(pdev->dev, "error writing to STB: %d\n", rc);
}
static void amd_pmc_s2idle_restore(void)
{
struct amd_pmc_dev *pdev = &pmc;
@ -733,6 +744,7 @@ static void amd_pmc_s2idle_restore(void)
static struct acpi_s2idle_dev_ops amd_pmc_s2idle_dev_ops = {
.prepare = amd_pmc_s2idle_prepare,
.check = amd_pmc_s2idle_check,
.restore = amd_pmc_s2idle_restore,
};
#endif