On 2/21/24 1:12 PM, David E. Box wrote:
> 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. We are told the current update may change
> again before a final release so we can't upstream a fix just yet. In the
> meantime, remove SSRAM support for Lunar Lake so the driver can load and
> provide some basic functionality.
I would remove usage of "We" and just comment that that the value
is expected to change again. So disable the support till it is finalized.
>
> 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@xxxxxxxxxxxxxxx>
> ---
Change looks fine to me.
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
> drivers/platform/x86/intel/pmc/lnl.c | 38 +++-------------------------
> 1 file changed, 4 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/pmc/lnl.c b/drivers/platform/x86/intel/pmc/lnl.c
> index abad17cdd3d7..068d72504683 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->map = &lnl_socm_reg_map;
> + ret = get_primary_reg_base(pmc);
> + if (ret)
> + return ret;
>
> pmc_core_get_low_power_modes(pmcdev);
>
> - if (ssram_init) {
> - ret = pmc_core_ssram_get_lpm_reqs(pmcdev);
> - if (ret)
> - return ret;
> - }
> -
> return 0;
> }
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
