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platform/x86/amd: pmc: Write dummy postcode into the STB DRAM 

Bugzilla: https://bugzilla.redhat.com/2162507

commit b0d4bb973539f5e60fff37ea0f211598cac614a8
Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Date:   Mon Feb 6 20:38:53 2023 +0530

    platform/x86/amd: pmc: Write dummy postcode into the STB DRAM

    Based on the recommendation from the PMFW team in order to get the
    recent telemetry data present on the STB DRAM the driver is required
    to send one dummy write to the STB buffer, so it internally triggers
    the PMFW to emit the latest telemetry data in the STB DRAM region.

    Reviewed-by: Hans de Goede <hdegoede@redhat.com>
    Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
    Link: https://lore.kernel.org/r/20230206150855.1938810-3-Shyam-sundar.S-k@amd.com
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Signed-off-by: David Arcari <darcari@redhat.com>
This commit is contained in:
David Arcari 2023-05-11 13:38:30 -04:00
parent 355a0b613d
commit 9cd7d533aa
1 changed files with 6 additions and 0 deletions
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6
drivers/platform/x86/amd/pmc.c
View File

@ -43,6 +43,7 @@
#define AMD_PMC_STB_S2IDLE_PREPARE 0xC6000001
#define AMD_PMC_STB_S2IDLE_RESTORE 0xC6000002
#define AMD_PMC_STB_S2IDLE_CHECK 0xC6000003
#define AMD_PMC_STB_DUMMY_PC 0xC6000007
/* STB S2D(Spill to DRAM) has different message port offset */
#define STB_SPILL_TO_DRAM 0xBE
@ -250,6 +251,11 @@ static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp)
u32 *buf, fsize, num_samples, stb_rdptr_offset = 0;
int ret;
/* Write dummy postcode while reading the STB buffer */
ret = amd_pmc_write_stb(dev, AMD_PMC_STB_DUMMY_PC);
if (ret)
dev_err(dev->dev, "error writing to STB: %d\n", ret);
buf = kzalloc(S2D_TELEMETRY_BYTES_MAX, GFP_KERNEL);
if (!buf)
return -ENOMEM;