add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/arch/arc/mm/cache.c
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@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ARC Cache Management
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  *
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  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/module.h>
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@@ -113,10 +110,24 @@
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 	}
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 	READ_BCR(ARC_REG_CLUSTER_BCR, cbcr);
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-	if (cbcr.c)
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+	if (cbcr.c) {
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 		ioc_exists = 1;
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-	else
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+
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+		/*
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+		 * As for today we don't support both IOC and ZONE_HIGHMEM enabled
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+		 * simultaneously. This happens because as of today IOC aperture covers
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+		 * only ZONE_NORMAL (low mem) and any dma transactions outside this
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+		 * region won't be HW coherent.
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+		 * If we want to use both IOC and ZONE_HIGHMEM we can use
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+		 * bounce_buffer to handle dma transactions to HIGHMEM.
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+		 * Also it is possible to modify dma_direct cache ops or increase IOC
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+		 * aperture size if we are planning to use HIGHMEM without PAE.
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+		 */
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+		if (IS_ENABLED(CONFIG_HIGHMEM) || is_pae40_enabled())
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+			ioc_enable = 0;
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+	} else {
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 		ioc_enable = 0;
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+	}
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 	/* HS 2.0 didn't have AUX_VOL */
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 	if (cpuinfo_arc700[cpu].core.family > 0x51) {
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@@ -1158,19 +1169,6 @@
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 	if (!ioc_enable)
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 		return;
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-	/*
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-	 * As for today we don't support both IOC and ZONE_HIGHMEM enabled
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-	 * simultaneously. This happens because as of today IOC aperture covers
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-	 * only ZONE_NORMAL (low mem) and any dma transactions outside this
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-	 * region won't be HW coherent.
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-	 * If we want to use both IOC and ZONE_HIGHMEM we can use
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-	 * bounce_buffer to handle dma transactions to HIGHMEM.
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-	 * Also it is possible to modify dma_direct cache ops or increase IOC
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-	 * aperture size if we are planning to use HIGHMEM without PAE.
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-	 */
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-	if (IS_ENABLED(CONFIG_HIGHMEM))
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-		panic("IOC and HIGHMEM can't be used simultaneously");
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-
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 	/* Flush + invalidate + disable L1 dcache */
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 	__dc_disable();
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@@ -1294,7 +1292,7 @@
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 	/*
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 	 * In case of IOC (say IOC+SLC case), pointers above could still be set
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 	 * but end up not being relevant as the first function in chain is not
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-	 * called at all for @dma_direct_ops
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+	 * called at all for devices using coherent DMA.
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 	 *     arch_sync_dma_for_cpu() -> dma_cache_*() -> __dma_cache_*()
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 	 */
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 }