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authorEric Anholt <eric@anholt.net>2015-03-02 22:01:12 +0100
committerEric Anholt <eric@anholt.net>2015-10-21 11:33:12 +0200
commitc8b75bca92cbf064b9fa125fc74a85994452e935 (patch)
treeb138884349ffeef48cd83a1a9937d15c875f42cc /drivers/gpu/drm/vc4/vc4_bo.c
parentdrm/vc4: Add devicetree bindings for VC4. (diff)
downloadlinux-c8b75bca92cbf064b9fa125fc74a85994452e935.tar.xz
linux-c8b75bca92cbf064b9fa125fc74a85994452e935.zip
drm/vc4: Add KMS support for Raspberry Pi.
This is enough for fbcon and bringing up X using xf86-video-modesetting. It doesn't support the 3D accelerator or power management yet. v2: Drop FB_HELPER select thanks to Archit's patches. Do manual init ordering instead of using the .load hook. Structure registration more like tegra's, but still using the typical "component" code. Drop no-op hooks for atomic_begin and mode_fixup() now that they're optional. Drop sentinel in Makefile. Fix minor style nits I noticed on another reread. v3: Use the new bcm2835 clk driver to manage pixel/HSM clocks instead of having a fixed video mode. Use exynos-style component driver matching instead of devicetree nodes to list the component driver instances. Rename compatibility strings to say bcm2835, and distinguish pv0/1/2. Clean up some h/vsync code, and add in interlaced mode setup. Fix up probe/bind error paths. Use bitops.h macros for vc4_regs.h v4: Include i2c.h, allow building under COMPILE_TEST, drop msleep now that other bugs have been fixed, add timeouts to cpu_relax() loops, rename hpd-gpio to hpd-gpios. Signed-off-by: Eric Anholt <eric@anholt.net> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_bo.c')
-rw-r--r--drivers/gpu/drm/vc4/vc4_bo.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
new file mode 100644
index 000000000000..ab9f5108ae1a
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* DOC: VC4 GEM BO management support.
+ *
+ * The VC4 GPU architecture (both scanout and rendering) has direct
+ * access to system memory with no MMU in between. To support it, we
+ * use the GEM CMA helper functions to allocate contiguous ranges of
+ * physical memory for our BOs.
+ */
+
+#include "vc4_drv.h"
+
+struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
+{
+ struct drm_gem_cma_object *cma_obj;
+
+ cma_obj = drm_gem_cma_create(dev, size);
+ if (IS_ERR(cma_obj))
+ return NULL;
+ else
+ return to_vc4_bo(&cma_obj->base);
+}
+
+int vc4_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+ struct vc4_bo *bo = NULL;
+ int ret;
+
+ if (args->pitch < min_pitch)
+ args->pitch = min_pitch;
+
+ if (args->size < args->pitch * args->height)
+ args->size = args->pitch * args->height;
+
+ bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
+ if (!bo)
+ return -ENOMEM;
+
+ ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
+ drm_gem_object_unreference_unlocked(&bo->base.base);
+
+ return ret;
+}