From 2cc2137ffbd191d4258cf49347578b510aa1085c Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Wed, 17 May 2017 02:20:05 +0300 Subject: [PATCH] v4l: vsp1: Map the DL and video buffers through the proper bus master On Gen2 hardware the VSP1 is a bus master and accesses the display list and video buffers through DMA directly. On Gen3 hardware, however, memory accesses go through a separate IP core called FCP. The VSP1 driver unconditionally maps DMA buffers through the VSP device. While this doesn't cause any practical issue so far, DMA mappings will be incorrect as soon as we will enable IOMMU support for the FCP on Gen3 platforms, resulting in IOMMU faults. Fix this by mapping all buffers through the FCP device if present, and through the VSP1 device as usual otherwise. Suggested-by: Magnus Damm [Cache the bus master device] Signed-off-by: Laurent Pinchart Reviewed-by: Kieran Bingham Signed-off-by: Kieran Bingham Acked-by: Mauro Cavalho Chehab --- drivers/media/platform/vsp1/vsp1.h | 1 + drivers/media/platform/vsp1/vsp1_dl.c | 4 ++-- drivers/media/platform/vsp1/vsp1_drv.c | 9 +++++++++ drivers/media/platform/vsp1/vsp1_video.c | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/vsp1/vsp1.h b/drivers/media/platform/vsp1/vsp1.h index 85387a6..847963b 100644 --- a/drivers/media/platform/vsp1/vsp1.h +++ b/drivers/media/platform/vsp1/vsp1.h @@ -74,6 +74,7 @@ struct vsp1_device { void __iomem *mmio; struct rcar_fcp_device *fcp; + struct device *bus_master; struct vsp1_bru *bru; struct vsp1_clu *clu; diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c index 85fe2b4..aaf17b1 100644 --- a/drivers/media/platform/vsp1/vsp1_dl.c +++ b/drivers/media/platform/vsp1/vsp1_dl.c @@ -137,7 +137,7 @@ static int vsp1_dl_body_init(struct vsp1_device *vsp1, dlb->vsp1 = vsp1; dlb->size = size; - dlb->entries = dma_alloc_wc(vsp1->dev, dlb->size, &dlb->dma, + dlb->entries = dma_alloc_wc(vsp1->bus_master, dlb->size, &dlb->dma, GFP_KERNEL); if (!dlb->entries) return -ENOMEM; @@ -150,7 +150,7 @@ static int vsp1_dl_body_init(struct vsp1_device *vsp1, */ static void vsp1_dl_body_cleanup(struct vsp1_dl_body *dlb) { - dma_free_wc(dlb->vsp1->dev, dlb->size, dlb->entries, dlb->dma); + dma_free_wc(dlb->vsp1->bus_master, dlb->size, dlb->entries, dlb->dma); } /** diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c index 048446a..95c26ed 100644 --- a/drivers/media/platform/vsp1/vsp1_drv.c +++ b/drivers/media/platform/vsp1/vsp1_drv.c @@ -764,6 +764,15 @@ static int vsp1_probe(struct platform_device *pdev) PTR_ERR(vsp1->fcp)); return PTR_ERR(vsp1->fcp); } + + /* + * When the FCP is present, it handles all bus master accesses + * for the VSP and must thus be used in place of the VSP device + * to map DMA buffers. + */ + vsp1->bus_master = rcar_fcp_get_device(vsp1->fcp); + } else { + vsp1->bus_master = vsp1->dev; } /* Configure device parameters based on the version register. */ diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c index eab3c3e..5af3486 100644 --- a/drivers/media/platform/vsp1/vsp1_video.c +++ b/drivers/media/platform/vsp1/vsp1_video.c @@ -1197,7 +1197,7 @@ struct vsp1_video *vsp1_video_create(struct vsp1_device *vsp1, video->queue.ops = &vsp1_video_queue_qops; video->queue.mem_ops = &vb2_dma_contig_memops; video->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; - video->queue.dev = video->vsp1->dev; + video->queue.dev = video->vsp1->bus_master; ret = vb2_queue_init(&video->queue); if (ret < 0) { dev_err(video->vsp1->dev, "failed to initialize vb2 queue\n"); -- 2.7.4