diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0022-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0022-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0022-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch b/target/linux/brcm2708/patches-4.4/0022-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch new file mode 100644 index 0000000000..e3c9595423 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0022-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch @@ -0,0 +1,98 @@ +From 16dc5e0535e48ce3e9c6995c87118e9e7b5b775a 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 022/127] 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. +Don't mask out channel 2. + +Signed-off-by: Noralf Trønnes <noralf@tronnes.org> +--- + drivers/dma/Kconfig | 2 +- + drivers/dma/bcm2835-dma.c | 30 ++++++++++++++++++++++++------ + 2 files changed, 25 insertions(+), 7 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 +@@ -36,6 +36,7 @@ + #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> +@@ -786,6 +787,10 @@ 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); +@@ -818,11 +823,8 @@ static int bcm2835_dma_probe(struct plat + goto err_no_dma; + } + +- /* +- * 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); ++ /* Channel 0 is used by the legacy API */ ++ chans_available &= ~BCM2835_DMA_BULK_MASK; + + for (i = 0; i < pdev->num_resources; i++) { + irq = platform_get_irq(pdev, i); +@@ -866,6 +868,7 @@ 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); + +@@ -881,7 +884,22 @@ 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"); |