[PATCH 6.8 549/715] platform/x86/intel/pmc/lnl: Remove SSRAM support

Sasha Levin
2024-03-24T22:44:02Z

From: "David E. Box" <david.e.box@linux.intel.com>

[ Upstream commit e6ba4acde44957dc9bdc3222b5739217a102752d ]

A recent PMC firmware change in Lunar Lake caused the pmc_core driver to
fail to probe. This is due to a change in the GUID for PMC telemetry coming
from the SSRAM device. Until a final release is ready this value may
change again. In the meantime, disable the SSRAM support for Lunar Lake so
the driver can load and provide some basic functionality.

Fixes: 3748dfdae2a6 ("platform/x86/intel/pmc: Add Lunar Lake M support to intel_pmc_core driver")
Signed-off-by: "David E. Box" <david.e.box@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240227190134.1592072-2-david.e.box@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/platform/x86/intel/pmc/lnl.c | 40 ++++------------------------
1 file changed, 5 insertions(+), 35 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/lnl.c b/drivers/platform/x86/intel/pmc/lnl.c
index abad17cdd3d78..068d72504683f 100644
--- a/drivers/platform/x86/intel/pmc/lnl.c
+++ b/drivers/platform/x86/intel/pmc/lnl.c
@@ -13,21 +13,6 @@

#include "core.h"

-#define SOCM_LPM_REQ_GUID 0x11594920
-
-#define PMC_DEVID_SOCM 0xa87f
-
-static const u8 LNL_LPM_REG_INDEX[] = {0, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20};
-
-static struct pmc_info lnl_pmc_info_list[] = {
- {
- .guid = SOCM_LPM_REQ_GUID,
- .devid = PMC_DEVID_SOCM,
- .map = &lnl_socm_reg_map,
- },
- {}
-};
-
const struct pmc_bit_map lnl_ltr_show_map[] = {
{"SOUTHPORT_A", CNP_PMC_LTR_SPA},
{"SOUTHPORT_B", CNP_PMC_LTR_SPB},
@@ -490,7 +475,6 @@ const struct pmc_reg_map lnl_socm_reg_map = {
.lpm_sts = lnl_lpm_maps,
.lpm_status_offset = MTL_LPM_STATUS_OFFSET,
.lpm_live_status_offset = MTL_LPM_LIVE_STATUS_OFFSET,
- .lpm_reg_index = LNL_LPM_REG_INDEX,
};

#define LNL_NPU_PCI_DEV 0x643e
@@ -517,33 +501,19 @@ static int lnl_resume(struct pmc_dev *pmcdev)
int lnl_core_init(struct pmc_dev *pmcdev)
{
int ret;
- int func = 2;
- bool ssram_init = true;
struct pmc *pmc = pmcdev->pmcs[PMC_IDX_SOC];

lnl_d3_fixup();

pmcdev->suspend = cnl_suspend;
pmcdev->resume = lnl_resume;
- pmcdev->regmap_list = lnl_pmc_info_list;
- ret = pmc_core_ssram_init(pmcdev, func);
-
- /* If regbase not assigned, set map and discover using legacy method */
- if (ret) {
- ssram_init = false;
- pmc->map = &lnl_socm_reg_map;
- ret = get_primary_reg_base(pmc);
- if (ret)
- return ret;
- }

- pmc_core_get_low_power_modes(pmcdev);
+ pmc->map = &lnl_socm_reg_map;
+ ret = get_primary_reg_base(pmc);
+ if (ret)
+ return ret;

- if (ssram_init) {
- ret = pmc_core_ssram_get_lpm_reqs(pmcdev);
- if (ret)
- return ret;
- }
+ pmc_core_get_low_power_modes(pmcdev);

return 0;
}
--
2.43.0