openwrtv3/target/linux/brcm2708/patches-4.4/0391-Revert-dmaengine-bcm2835-Load-driver-early-and-suppo.patch

From 7d58feb7f06a5e05aa3b99b32b4bba4b927b7b3f Mon Sep 17 00:00:00 2001
From: Martin Sperl <kernel@martin.sperl.org>
Date: Fri, 22 Apr 2016 17:17:30 +0000
Subject: [PATCH] Revert "dmaengine: bcm2835: Load driver early and support
 legacy API"

This reverts commit 6f56fff39c811953809b011f59c49a2122c4d173.
---
 drivers/dma/Kconfig       |  2 +-
 drivers/dma/bcm2835-dma.c | 30 ++++++------------------------
 2 files changed, 7 insertions(+), 25 deletions(-)

--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -108,7 +108,7 @@ config COH901318
 
 config DMA_BCM2835
 	tristate "BCM2835 DMA engine support"
-	depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
+	depends on ARCH_BCM2835
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -36,7 +36,6 @@
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/module.h>
-#include <linux/platform_data/dma-bcm2708.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/io.h>
@@ -787,10 +786,6 @@ static int bcm2835_dma_probe(struct plat
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	rc = bcm_dmaman_probe(pdev, base, BCM2835_DMA_BULK_MASK);
-	if (rc)
-		dev_err(&pdev->dev, "Failed to initialize the legacy API\n");
-
 	od->base = base;
 
 	dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
@@ -823,8 +818,11 @@ static int bcm2835_dma_probe(struct plat
 		goto err_no_dma;
 	}
 
-	/* Channel 0 is used by the legacy API */
-	chans_available &= ~BCM2835_DMA_BULK_MASK;
+	/*
+	 * Do not use the FIQ and BULK channels,
+	 * because they are used by the GPU.
+	 */
+	chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK);
 
 	for (i = 0; i < pdev->num_resources; i++) {
 		irq = platform_get_irq(pdev, i);
@@ -868,7 +866,6 @@ static int bcm2835_dma_remove(struct pla
 {
 	struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
 
-	bcm_dmaman_remove(pdev);
 	dma_async_device_unregister(&od->ddev);
 	bcm2835_dma_free(od);
 
@@ -884,22 +881,7 @@ static struct platform_driver bcm2835_dm
 	},
 };
 
-static int bcm2835_dma_init(void)
-{
-	return platform_driver_register(&bcm2835_dma_driver);
-}
-
-static void bcm2835_dma_exit(void)
-{
-	platform_driver_unregister(&bcm2835_dma_driver);
-}
-
-/*
- * Load after serial driver (arch_initcall) so we see the messages if it fails,
- * but before drivers (module_init) that need a DMA channel.
- */
-subsys_initcall(bcm2835_dma_init);
-module_exit(bcm2835_dma_exit);
+module_platform_driver(bcm2835_dma_driver);
 
 MODULE_ALIAS("platform:bcm2835-dma");
 MODULE_DESCRIPTION("BCM2835 DMA engine driver");