linux-kernel - [PATCH 4/4] platform/x86: pmc_atom: improve critclk

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Message-Id: <20210302163309.25528-5-henning.schild@siemens.com>
Date:   Tue,  2 Mar 2021 17:33:09 +0100
From:   Henning Schild <henning.schild@...mens.com>
To:     linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-watchdog@...r.kernel.org
Cc:     Srikanth Krishnakar <skrishnakar@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Henning Schild <henning.schild@...mens.com>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Pavel Machek <pavel@....cz>,
        Michael Haener <michael.haener@...mens.com>
Subject: [PATCH 4/4] platform/x86: pmc_atom: improve critclk_systems matching for Siemens PCs

From: Henning Schild <henning.schild@...mens.com>

Siemens industrial PCs unfortunately can not always be properly
identified the way we used to. An earlier commit introduced code that
allows proper identification without looking at DMI strings that could
differ based on product branding.
Switch over to that proper way and revert commits that used to collect
the machines based on unstable strings.

Fixes: 648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL")
Fixes: e8796c6c69d1 ("platform/x86: pmc_atom: Add Siemens CONNECT ...")
Fixes: f110d252ae79 ("platform/x86: pmc_atom: Add Siemens SIMATIC ...")
Fixes: ad0d315b4d4e ("platform/x86: pmc_atom: Add Siemens SIMATIC ...")
Tested-by: Michael Haener <michael.haener@...mens.com>
Signed-off-by: Henning Schild <henning.schild@...mens.com>
---
 drivers/platform/x86/pmc_atom.c | 39 ++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/platform/x86/pmc_atom.c b/drivers/platform/x86/pmc_atom.c
index ca684ed760d1..03344f5502ad 100644
--- a/drivers/platform/x86/pmc_atom.c
+++ b/drivers/platform/x86/pmc_atom.c
@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/platform_data/x86/clk-pmc-atom.h>
 #include <linux/platform_data/x86/pmc_atom.h>
+#include <linux/platform_data/x86/simatic-ipc.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
 #include <linux/seq_file.h>
@@ -424,30 +425,31 @@ static const struct dmi_system_id critclk_systems[] = {
 		},
 	},
 	{
-		.ident = "SIMATIC IPC227E",
+		.ident = "SIEMENS AG",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "6ES7647-8B"),
-		},
-	},
-	{
-		.ident = "SIMATIC IPC277E",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "6AV7882-0"),
-		},
-	},
-	{
-		.ident = "CONNECT X300",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "A5E45074588"),
 		},
 	},
 
 	{ /*sentinel*/ }
 };
 
+static int pmc_clk_is_critical(const struct dmi_system_id *d)
+{
+	int ret = true;
+	u32 station_id;
+
+	if (!strcmp(d->ident, "SIEMENS AG")) {
+		if (dmi_walk(simatic_ipc_find_dmi_entry_helper, &station_id))
+			ret = false;
+		else
+			ret = (station_id == SIMATIC_IPC_IPC227E ||
+			       station_id == SIMATIC_IPC_IPC277E);
+	}
+
+	return ret;
+}
+
 static int pmc_setup_clks(struct pci_dev *pdev, void __iomem *pmc_regmap,
 			  const struct pmc_data *pmc_data)
 {
@@ -462,8 +464,9 @@ static int pmc_setup_clks(struct pci_dev *pdev, void __iomem *pmc_regmap,
 	clk_data->base = pmc_regmap; /* offset is added by client */
 	clk_data->clks = pmc_data->clks;
 	if (d) {
-		clk_data->critical = true;
-		pr_info("%s critclks quirk enabled\n", d->ident);
+		clk_data->critical = pmc_clk_is_critical(d);
+		if (clk_data->critical)
+			pr_info("%s critclks quirk enabled\n", d->ident);
 	}
 
 	clkdev = platform_device_register_data(&pdev->dev, "clk-pmc-atom",
-- 
2.26.2