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drm/mediatek: set DMA max segment size

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This driver requires imported PRIME buffers to appear contiguously in
its IO address space. Make sure this is the case by setting the maximum
DMA segment size to a more suitable value than the default 64KB.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: CK Hu <ck.hu@mediatek.com>
This commit is contained in:
Alexandre Courbot 2019-07-29 14:33:35 +09:00 committed by CK Hu
parent 4c6f3196e6
commit 070955558e
2 changed files with 35 additions and 2 deletions
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35
drivers/gpu/drm/mediatek/mtk_drm_drv.c
View file

@ -213,6 +213,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
struct mtk_drm_private *private = drm->dev_private;
struct platform_device *pdev;
struct device_node *np;
struct device *dma_dev;
int ret;
if (!iommu_present(&platform_bus_type))
@ -275,7 +276,29 @@ static int mtk_drm_kms_init(struct drm_device *drm)
goto err_component_unbind;
}
private->dma_dev = &pdev->dev;
dma_dev = &pdev->dev;
private->dma_dev = dma_dev;
/*
* Configure the DMA segment size to make sure we get contiguous IOVA
* when importing PRIME buffers.
*/
if (!dma_dev->dma_parms) {
private->dma_parms_allocated = true;
dma_dev->dma_parms =
devm_kzalloc(drm->dev, sizeof(*dma_dev->dma_parms),
GFP_KERNEL);
}
if (!dma_dev->dma_parms) {
ret = -ENOMEM;
goto err_component_unbind;
}
ret = dma_set_max_seg_size(dma_dev, (unsigned int)DMA_BIT_MASK(32));
if (ret) {
dev_err(dma_dev, "Failed to set DMA segment size\n");
goto err_unset_dma_parms;
}
/*
* We don't use the drm_irq_install() helpers provided by the DRM
@ -285,13 +308,16 @@ static int mtk_drm_kms_init(struct drm_device *drm)
drm->irq_enabled = true;
ret = drm_vblank_init(drm, MAX_CRTC);
if (ret < 0)
goto err_component_unbind;
goto err_unset_dma_parms;
drm_kms_helper_poll_init(drm);
drm_mode_config_reset(drm);
return 0;
err_unset_dma_parms:
if (private->dma_parms_allocated)
dma_dev->dma_parms = NULL;
err_component_unbind:
component_unbind_all(drm->dev, drm);
err_config_cleanup:
@ -302,9 +328,14 @@ static int mtk_drm_kms_init(struct drm_device *drm)
static void mtk_drm_kms_deinit(struct drm_device *drm)
{
struct mtk_drm_private *private = drm->dev_private;
drm_kms_helper_poll_fini(drm);
drm_atomic_helper_shutdown(drm);
if (private->dma_parms_allocated)
private->dma_dev->dma_parms = NULL;
component_unbind_all(drm->dev, drm);
drm_mode_config_cleanup(drm);
}

2
drivers/gpu/drm/mediatek/mtk_drm_drv.h
View file

@ -51,6 +51,8 @@ struct mtk_drm_private {
} commit;
struct drm_atomic_state *suspend_state;
bool dma_parms_allocated;
};
extern struct platform_driver mtk_ddp_driver;