Message ID | CAOMZO5CfpKTXqOOSJznUgXV-=7_1JOWKDcLNcXbPjDhSkydVcg@mail.gmail.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
On Fri, Mar 09, 2018 at 11:12:37AM -0300, Fabio Estevam wrote: > Hi Russell, > > On Fri, Mar 9, 2018 at 8:34 AM, Russell King - ARM Linux > <linux@armlinux.org.uk> wrote: > > On Fri, Mar 09, 2018 at 12:20:59PM +0100, Lucas Stach wrote: > >> All the DRM GEM dma-buf import/export operations are done through the > >> virtual DRM master device. As this isn't instanciated from DT anymore > >> we need to make sure the DMA ops are set up correctly. > >> > >> Signed-off-by: Lucas Stach <l.stach@pengutronix.de> > >> --- > >> drivers/gpu/drm/etnaviv/etnaviv_drv.c | 3 ++- > >> 1 file changed, 2 insertions(+), 1 deletion(-) > >> > >> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c > >> index ab50090d066c..d7666aed943b 100644 > >> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c > >> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c > >> @@ -655,7 +655,8 @@ static int etnaviv_pdev_probe(struct platform_device *pdev) > >> struct device *dev = &pdev->dev; > >> struct component_match *match = NULL; > >> > >> - dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); > >> + arch_setup_dma_ops(dev, 0, 0x100000000, NULL, false); > >> + dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); > > > > NAK. dma_coerce_mask_and_coherent() exists for broken devices. Please > > instead ensure that the device is created with the proper default DMA > > mask. > > Should it be like this (like vc4_drv.c) ? > > --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c > +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c > @@ -578,6 +578,8 @@ static int etnaviv_bind(struct device *dev) > struct drm_device *drm; > int ret; > > + dev->coherent_dma_mask = DMA_BIT_MASK(32); > + No. Drivers should be using dma_set_coherent_mask(). Whoever is creating this struct device has the responsibility to initialise the DMA mask to something sensible.
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c @@ -578,6 +578,8 @@ static int etnaviv_bind(struct device *dev) struct drm_device *drm; int ret; + dev->coherent_dma_mask = DMA_BIT_MASK(32); + drm = drm_dev_alloc(&etnaviv_drm_driver, dev); if (IS_ERR(drm)) return PTR_ERR(drm); @@ -655,8 +657,6 @@ static int etnaviv_pdev_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct component_match *match = NULL; - dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); - if (!dev->platform_data) { struct device_node *core_node; _______________________________________________