diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_crtc.c | 37 | ||||
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_drv.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_drv.h | 3 |
3 files changed, 45 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c index cc85c16cbc2a..ae2e16ed3874 100644 --- a/drivers/gpu/drm/omapdrm/omap_crtc.c +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c @@ -23,6 +23,7 @@ #include <drm/drm_crtc_helper.h> #include <drm/drm_mode.h> #include <drm/drm_plane_helper.h> +#include <linux/math64.h> #include "omap_drv.h" @@ -400,6 +401,41 @@ static void omap_crtc_atomic_disable(struct drm_crtc *crtc, drm_crtc_vblank_off(crtc); } +static enum drm_mode_status omap_crtc_mode_valid(struct drm_crtc *crtc, + const struct drm_display_mode *mode) +{ + struct omap_drm_private *priv = crtc->dev->dev_private; + + /* Check for bandwidth limit */ + if (priv->max_bandwidth) { + /* + * Estimation for the bandwidth need of a given mode with one + * full screen plane: + * bandwidth = resolution * 32bpp * (pclk / (vtotal * htotal)) + * ^^ Refresh rate ^^ + * + * The interlaced mode is taken into account by using the + * pixelclock in the calculation. + * + * The equation is rearranged for 64bit arithmetic. + */ + uint64_t bandwidth = mode->clock * 1000; + unsigned int bpp = 4; + + bandwidth = bandwidth * mode->hdisplay * mode->vdisplay * bpp; + bandwidth = div_u64(bandwidth, mode->htotal * mode->vtotal); + + /* + * Reject modes which would need more bandwidth if used with one + * full resolution plane (most common use case). + */ + if (priv->max_bandwidth < bandwidth) + return MODE_BAD; + } + + return MODE_OK; +} + static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc) { struct omap_crtc *omap_crtc = to_omap_crtc(crtc); @@ -621,6 +657,7 @@ static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = { .atomic_flush = omap_crtc_atomic_flush, .atomic_enable = omap_crtc_atomic_enable, .atomic_disable = omap_crtc_atomic_disable, + .mode_valid = omap_crtc_mode_valid, }; /* ----------------------------------------------------------------------------- diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c index 96857c508ee0..c4bb261dfcd9 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.c +++ b/drivers/gpu/drm/omapdrm/omap_drv.c @@ -563,6 +563,11 @@ static int pdev_probe(struct platform_device *pdev) ddev->dev_private = priv; platform_set_drvdata(pdev, ddev); + /* Get memory bandwidth limits */ + if (priv->dispc_ops->get_memory_bandwidth_limit) + priv->max_bandwidth = + priv->dispc_ops->get_memory_bandwidth_limit(); + omap_gem_init(ddev); ret = omap_modeset_init(ddev); diff --git a/drivers/gpu/drm/omapdrm/omap_drv.h b/drivers/gpu/drm/omapdrm/omap_drv.h index 4bd1e9070b31..d404e8c56b61 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.h +++ b/drivers/gpu/drm/omapdrm/omap_drv.h @@ -83,6 +83,9 @@ struct omap_drm_private { spinlock_t wait_lock; /* protects the wait_list */ struct list_head wait_list; /* list of omap_irq_wait */ uint32_t irq_mask; /* enabled irqs in addition to wait_list */ + + /* memory bandwidth limit if it is needed on the platform */ + unsigned int max_bandwidth; }; |