Commit 66a91c00 authored Aug 16, 2021 by David E. Box Committed by Hans de Goede Aug 20, 2021

platform/x86/intel: pmc/core: Add GBE Package C10 fix for Alder Lake PCH

Alder PCH uses the same Gigabit Ethernet (GBE) device as Tiger Lake PCH
which cannot achieve PC10 without ignoring the PMC GBE LTR. Add this
work around for Alder Lake PCH as well.

Cc: Chao Qin <chao.qin@intel.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: You-Sheng Yang <vicamo.yang@canonical.com>
Acked-by: Rajneesh Bhardwaj <irenic.rajneesh@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/9168e8bd687f2d0d5eb0ed116e08d0764eadf7b3.1629091915.git.gayatri.kammela@intel.com

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

parent 6cfce3ef

drivers/platform/x86/intel/pmc/core.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -2020,10 +2020,10 @@ static int pmc_core_probe(struct platform_device *pdev)
		pmc_core_get_tgl_lpm_reqs(pdev);

		/*
		* On TGL, due to a hardware limitation, the GBE LTR blocks PC10 when
		* a cable is attached. Tell the PMC to ignore it.
		* On TGL and ADL, due to a hardware limitation, the GBE LTR blocks PC10
		* when a cable is attached. Tell the PMC to ignore it.
		*/
		if (pmcdev->map == &tgl_reg_map) {
		if (pmcdev->map == &tgl_reg_map \|\| pmcdev->map == &adl_reg_map) {
		dev_dbg(&pdev->dev, "ignoring GBE LTR\n");
		pmc_core_send_ltr_ignore(pmcdev, 3);
		}