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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/tpm/tpm_tis.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2005, 2006 IBM Corporation
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  * Copyright (C) 2014, 2015 Intel Corporation
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@@ -13,11 +14,6 @@
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  *
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  * This device driver implements the TPM interface as defined in
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  * the TCG TPM Interface Spec version 1.2, revision 1.0.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation, version 2 of the
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- * License.
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  */
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 #include <linux/init.h>
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 #include <linux/module.h>
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@@ -52,6 +48,31 @@
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 static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
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 {
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 	return container_of(data, struct tpm_tis_tcg_phy, priv);
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+}
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+
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+#ifdef CONFIG_PREEMPT_RT
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+/*
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+ * Flushes previous write operations to chip so that a subsequent
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+ * ioread*()s won't stall a cpu.
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+ */
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+static inline void tpm_tis_flush(void __iomem *iobase)
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+{
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+	ioread8(iobase + TPM_ACCESS(0));
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+}
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+#else
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+#define tpm_tis_flush(iobase) do { } while (0)
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+#endif
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+
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+static inline void tpm_tis_iowrite8(u8 b, void __iomem *iobase, u32 addr)
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+{
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+	iowrite8(b, iobase + addr);
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+	tpm_tis_flush(iobase);
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+}
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+
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+static inline void tpm_tis_iowrite32(u32 b, void __iomem *iobase, u32 addr)
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+{
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+	iowrite32(b, iobase + addr);
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+	tpm_tis_flush(iobase);
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 }
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 static int interrupts = -1;
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@@ -173,7 +194,7 @@
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 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
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 	while (len--)
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-		iowrite8(*value++, phy->iobase + addr);
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+		tpm_tis_iowrite8(*value++, phy->iobase, addr);
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 	return 0;
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 }
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@@ -200,7 +221,7 @@
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 {
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 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
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-	iowrite32(value, phy->iobase + addr);
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+	tpm_tis_iowrite32(value, phy->iobase, addr);
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 	return 0;
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 }
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@@ -264,6 +285,13 @@
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 	return tpm_tis_init(&pnp_dev->dev, &tpm_info);
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 }
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+/*
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+ * There is a known bug caused by 93e1b7d42e1e ("[PATCH] tpm: add HID module
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+ * parameter"). This commit added IFX0102 device ID, which is also used by
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+ * tpm_infineon but ignored to add quirks to probe which driver ought to be
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+ * used.
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+ */
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+
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 static struct pnp_device_id tpm_pnp_tbl[] = {
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 	{"PNP0C31", 0},		/* TPM */
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 	{"ATM1200", 0},		/* Atmel */
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@@ -315,7 +343,7 @@
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 	}
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 	tpm_info.res = *res;
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-	tpm_info.irq = platform_get_irq(pdev, 0);
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+	tpm_info.irq = platform_get_irq_optional(pdev, 0);
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 	if (tpm_info.irq <= 0) {
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 		if (pdev != force_pdev)
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 			tpm_info.irq = -1;