diff options
| author | Thierry Reding <treding@nvidia.com> | 2014-06-26 21:41:53 +0200 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2014-11-13 16:14:48 +0100 |
| commit | df06b759f2cf4690fa9991edb1504ba39932b2bb (patch) | |
| tree | 0365d27fb82b94d4569c8b86dd775838bedc5ff1 /drivers/gpu/drm/tegra/dc.c | |
| parent | 1d1e6fe9b5cd9e51c0b064b60f673a973cac38ba (diff) | |
drm/tegra: Add IOMMU support
When an IOMMU device is available on the platform bus, allocate an IOMMU
domain and attach the display controllers to it. The display controllers
can then scan out non-contiguous buffers by mapping them through the
IOMMU.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/drm/tegra/dc.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/dc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 4a015232e2e8..5f138b7c81bf 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -9,6 +9,7 @@ #include <linux/clk.h> #include <linux/debugfs.h> +#include <linux/iommu.h> #include <linux/reset.h> #include <soc/tegra/pmc.h> @@ -1290,6 +1291,17 @@ static int tegra_dc_init(struct host1x_client *client) struct tegra_drm *tegra = drm->dev_private; int err; + if (tegra->domain) { + err = iommu_attach_device(tegra->domain, dc->dev); + if (err < 0) { + dev_err(dc->dev, "failed to attach to domain: %d\n", + err); + return err; + } + + dc->domain = tegra->domain; + } + drm_crtc_init(drm, &dc->base, &tegra_crtc_funcs); drm_mode_crtc_set_gamma_size(&dc->base, 256); drm_crtc_helper_add(&dc->base, &tegra_crtc_helper_funcs); @@ -1347,6 +1359,11 @@ static int tegra_dc_exit(struct host1x_client *client) return err; } + if (dc->domain) { + iommu_detach_device(dc->domain, dc->dev); + dc->domain = NULL; + } + return 0; } |