linux-kernel - [PATCH v7 5/5] platform/x86/intel: pmc/core: Add GBE Package C10 fix for Alder Lake PCH

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Date:   Mon, 16 Aug 2021 09:58:34 -0700
From:   Gayatri Kammela <gayatri.kammela@...el.com>
To:     platform-driver-x86@...r.kernel.org
Cc:     mgross@...ux.intel.com, hdegoede@...hat.com,
        irenic.rajneesh@...il.com, andriy.shevchenko@...ux.intel.com,
        vicamo.yang@...onical.com, srinivas.pandruvada@...el.com,
        david.e.box@...el.com, chao.qin@...el.com,
        linux-kernel@...r.kernel.org, tamar.mashiah@...el.com,
        gregkh@...uxfoundation.org, rajatja@...gle.com,
        Shyam-sundar.S-k@....com, Alexander.Deucher@....com,
        mlimonci@....com, "David E. Box" <david.e.box@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v7 5/5] platform/x86/intel: pmc/core: Add GBE Package C10 fix for Alder Lake PCH

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

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@...el.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...el.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Tested-by: You-Sheng Yang <vicamo.yang@...onical.com>
Acked-by: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/pmc/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index e645ede591d8..7c4bf7d22fd5 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -1983,10 +1983,10 @@ 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);
 	}
-- 
2.25.1