aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch89
1 files changed, 89 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch b/target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch
new file mode 100644
index 0000000000..f8ad8f3229
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0401-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch
@@ -0,0 +1,89 @@
+From 479b918cb9511d5044cc660f0c74d42952a87910 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
+Date: Sat, 3 Oct 2015 22:22:55 +0200
+Subject: [PATCH] dmaengine: bcm2835: Load driver early and support legacy API
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Load driver early since at least bcm2708_fb doesn't support deferred
+probing and even if it did, we don't want the video driver deferred.
+
+Support the legacy DMA API which is needed by bcm2708_fb
+(but only using the dedicated dma channel 0).
+
+Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
+Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
+---
+ drivers/dma/Kconfig | 2 +-
+ drivers/dma/bcm2835-dma.c | 27 ++++++++++++++++++++++++++-
+ 2 files changed, 27 insertions(+), 2 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
++ depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+
+--- a/drivers/dma/bcm2835-dma.c
++++ b/drivers/dma/bcm2835-dma.c
+@@ -37,6 +37,7 @@
+ #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>
+@@ -1021,6 +1022,14 @@ static int bcm2835_dma_probe(struct plat
+
+ dev_dbg(&pdev->dev, "Load BCM2835 DMA engine driver\n");
+
++ /* load the legacy api if bit 0 in the mask is cleared */
++ if ((chans_available & BIT(0)) == 0) {
++ rc = bcm_dmaman_probe(pdev, base, BIT(0));
++ if (rc)
++ dev_err(&pdev->dev,
++ "Failed to initialize the legacy API\n");
++ }
++
+ return 0;
+
+ err_no_dma:
+@@ -1032,6 +1041,7 @@ 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);
+
+@@ -1047,7 +1057,22 @@ static struct platform_driver bcm2835_dm
+ },
+ };
+
+-module_platform_driver(bcm2835_dma_driver);
++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_ALIAS("platform:bcm2835-dma");
+ MODULE_DESCRIPTION("BCM2835 DMA engine driver");