Hi Gerd,

I've read the patches about the virtio-gpu, it's a nice design.

As far as I know, there are two other drivers used by qemu, CIRRUS and BOCHS.

I have a question about the relationship of these three drivers, is that the virtio-gpu

designed to replace the other two drivers? I mean are the CIRRUS and BOCHS

going to be deprecated in the future?

Would you please kindly explain this a little bit?

Actually, this is a problem by Martin Peres who is the GSoC xorg administor.

My proposal is "Convert the BOCHS and CIRRUS drivers to atomic mode-setting".

Martin wonder if the two drivers are going to be deprecated, there is no need for

me to do the job.

Best regards,

John

On Wed, Apr 1, 2015 at 9:15 PM, Gerd Hoffmann <kraxel@redhat.com> wrote:

After adding virtio-gpu I get this funky kconfig dependency loop.

scripts/kconfig/conf --oldconfig Kconfig
drivers/video/fbdev/Kconfig:5:error: recursive dependency detected!
drivers/video/fbdev/Kconfig:5: symbol FB is selected by DRM_KMS_FB_HELPER
drivers/gpu/drm/Kconfig:34: symbol DRM_KMS_FB_HELPER is selected by DRM_VIRTIO_GPU
drivers/gpu/drm/virtio/Kconfig:1: symbol DRM_VIRTIO_GPU depends on VIRTIO
drivers/virtio/Kconfig:1: symbol VIRTIO is selected by REMOTEPROC
drivers/remoteproc/Kconfig:4: symbol REMOTEPROC is selected by OMAP_REMOTEPROC
drivers/remoteproc/Kconfig:12: symbol OMAP_REMOTEPROC depends on OMAP_IOMMU
drivers/iommu/Kconfig:141: symbol OMAP_IOMMU is selected by VIDEO_OMAP3
drivers/media/platform/Kconfig:96: symbol VIDEO_OMAP3 depends on VIDEO_V4L2
drivers/media/v4l2-core/Kconfig:6: symbol VIDEO_V4L2 depends on I2C
drivers/i2c/Kconfig:7: symbol I2C is selected by FB_DDC
drivers/video/fbdev/Kconfig:59: symbol FB_DDC is selected by FB_CYBER2000_DDC
drivers/video/fbdev/Kconfig:374: symbol FB_CYBER2000_DDC depends on FB_CYBER2000
drivers/video/fbdev/Kconfig:362: symbol FB_CYBER2000 depends on FB

Making VIDEO_OMAP3 depend on OMAP_IOMMU instead of selecting it breaks the
loop, which looks like the best way to handle it to me. I'm open to better
suggestions though.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/media/platform/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index d9b872b..fc21734 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -87,8 +87,8 @@ config VIDEO_OMAP3
tristate "OMAP 3 Camera support"
depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
depends on HAS_DMA
+ depends on OMAP_IOMMU
select ARM_DMA_USE_IOMMU
- select OMAP_IOMMU
select VIDEOBUF2_DMA_CONTIG
---help---
Driver for an OMAP 3 camera controller.
--
1.8.3.1

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Best regards

Junwang Zhao

Microprocessor Research and Develop Center

Department of Computer Science &Technology

Peking University

Beijing, 100871, PRC