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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/soc/tegra/flowctrl.c
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@@ -1,21 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * drivers/soc/tegra/flowctrl.c
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  *
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  * Functions and macros to control the flowcontroller
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  *
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  * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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 #include <linux/cpumask.h>
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@@ -102,8 +91,23 @@
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 		reg &= ~TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP;
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 		/* clear wfi bitmap */
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 		reg &= ~TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP;
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-		/* pwr gating on wfi */
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-		reg |= TEGRA30_FLOW_CTRL_CSR_WFI_CPU0 << cpuid;
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+
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+		if (tegra_get_chip_id() == TEGRA30) {
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+			/*
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+			 * The wfi doesn't work well on Tegra30 because
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+			 * CPU hangs under some odd circumstances after
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+			 * power-gating (like memory running off PLLP),
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+			 * hence use wfe that is working perfectly fine.
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+			 * Note that Tegra30 TRM doc clearly stands that
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+			 * wfi should be used for the "Cluster Switching",
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+			 * while wfe for the power-gating, just like it
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+			 * is done on Tegra20.
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+			 */
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+			reg |= TEGRA20_FLOW_CTRL_CSR_WFE_CPU0 << cpuid;
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+		} else {
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+			/* pwr gating on wfi */
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+			reg |= TEGRA30_FLOW_CTRL_CSR_WFI_CPU0 << cpuid;
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+		}
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 		break;
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 	}
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 	reg |= FLOW_CTRL_CSR_INTR_FLAG;			/* clear intr flag */
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@@ -215,7 +219,7 @@
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 		return 0;
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 	}
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-	tegra_flowctrl_base = ioremap_nocache(res.start, resource_size(&res));
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+	tegra_flowctrl_base = ioremap(res.start, resource_size(&res));
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 	if (!tegra_flowctrl_base)
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 		return -ENXIO;
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