diff options
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_plane.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_plane.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c new file mode 100644 index 000000000000..cdd8b10c0147 --- /dev/null +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -0,0 +1,320 @@ +/* + * Copyright (C) 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 plane module + * + * Each DRM plane is a layer of pixels being scanned out by the HVS. + * + * At atomic modeset check time, we compute the HVS display element + * state that would be necessary for displaying the plane (giving us a + * chance to figure out if a plane configuration is invalid), then at + * atomic flush time the CRTC will ask us to write our element state + * into the region of the HVS that it has allocated for us. + */ + +#include "vc4_drv.h" +#include "vc4_regs.h" +#include "drm_atomic_helper.h" +#include "drm_fb_cma_helper.h" +#include "drm_plane_helper.h" + +struct vc4_plane_state { + struct drm_plane_state base; + u32 *dlist; + u32 dlist_size; /* Number of dwords in allocated for the display list */ + u32 dlist_count; /* Number of used dwords in the display list. */ +}; + +static inline struct vc4_plane_state * +to_vc4_plane_state(struct drm_plane_state *state) +{ + return (struct vc4_plane_state *)state; +} + +static const struct hvs_format { + u32 drm; /* DRM_FORMAT_* */ + u32 hvs; /* HVS_FORMAT_* */ + u32 pixel_order; + bool has_alpha; +} hvs_formats[] = { + { + .drm = DRM_FORMAT_XRGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888, + .pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = false, + }, + { + .drm = DRM_FORMAT_ARGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888, + .pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = true, + }, +}; + +static const struct hvs_format *vc4_get_hvs_format(u32 drm_format) +{ + unsigned i; + + for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) { + if (hvs_formats[i].drm == drm_format) + return &hvs_formats[i]; + } + + return NULL; +} + +static bool plane_enabled(struct drm_plane_state *state) +{ + return state->fb && state->crtc; +} + +struct drm_plane_state *vc4_plane_duplicate_state(struct drm_plane *plane) +{ + struct vc4_plane_state *vc4_state; + + if (WARN_ON(!plane->state)) + return NULL; + + vc4_state = kmemdup(plane->state, sizeof(*vc4_state), GFP_KERNEL); + if (!vc4_state) + return NULL; + + __drm_atomic_helper_plane_duplicate_state(plane, &vc4_state->base); + + if (vc4_state->dlist) { + vc4_state->dlist = kmemdup(vc4_state->dlist, + vc4_state->dlist_count * 4, + GFP_KERNEL); + if (!vc4_state->dlist) { + kfree(vc4_state); + return NULL; + } + vc4_state->dlist_size = vc4_state->dlist_count; + } + + return &vc4_state->base; +} + +void vc4_plane_destroy_state(struct drm_plane *plane, + struct drm_plane_state *state) +{ + struct vc4_plane_state *vc4_state = to_vc4_plane_state(state); + + kfree(vc4_state->dlist); + __drm_atomic_helper_plane_destroy_state(plane, &vc4_state->base); + kfree(state); +} + +/* Called during init to allocate the plane's atomic state. */ +void vc4_plane_reset(struct drm_plane *plane) +{ + struct vc4_plane_state *vc4_state; + + WARN_ON(plane->state); + + vc4_state = kzalloc(sizeof(*vc4_state), GFP_KERNEL); + if (!vc4_state) + return; + + plane->state = &vc4_state->base; + vc4_state->base.plane = plane; +} + +static void vc4_dlist_write(struct vc4_plane_state *vc4_state, u32 val) +{ + if (vc4_state->dlist_count == vc4_state->dlist_size) { + u32 new_size = max(4u, vc4_state->dlist_count * 2); + u32 *new_dlist = kmalloc(new_size * 4, GFP_KERNEL); + + if (!new_dlist) + return; + memcpy(new_dlist, vc4_state->dlist, vc4_state->dlist_count * 4); + + kfree(vc4_state->dlist); + vc4_state->dlist = new_dlist; + vc4_state->dlist_size = new_size; + } + + vc4_state->dlist[vc4_state->dlist_count++] = val; +} + +/* Writes out a full display list for an active plane to the plane's + * private dlist state. + */ +static int vc4_plane_mode_set(struct drm_plane *plane, + struct drm_plane_state *state) +{ + struct vc4_plane_state *vc4_state = to_vc4_plane_state(state); + struct drm_framebuffer *fb = state->fb; + struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0); + u32 ctl0_offset = vc4_state->dlist_count; + const struct hvs_format *format = vc4_get_hvs_format(fb->pixel_format); + uint32_t offset = fb->offsets[0]; + int crtc_x = state->crtc_x; + int crtc_y = state->crtc_y; + int crtc_w = state->crtc_w; + int crtc_h = state->crtc_h; + + if (crtc_x < 0) { + offset += drm_format_plane_cpp(fb->pixel_format, 0) * -crtc_x; + crtc_w += crtc_x; + crtc_x = 0; + } + + if (crtc_y < 0) { + offset += fb->pitches[0] * -crtc_y; + crtc_h += crtc_y; + crtc_y = 0; + } + + vc4_dlist_write(vc4_state, + SCALER_CTL0_VALID | + (format->pixel_order << SCALER_CTL0_ORDER_SHIFT) | + (format->hvs << SCALER_CTL0_PIXEL_FORMAT_SHIFT) | + SCALER_CTL0_UNITY); + + /* Position Word 0: Image Positions and Alpha Value */ + vc4_dlist_write(vc4_state, + VC4_SET_FIELD(0xff, SCALER_POS0_FIXED_ALPHA) | + VC4_SET_FIELD(crtc_x, SCALER_POS0_START_X) | + VC4_SET_FIELD(crtc_y, SCALER_POS0_START_Y)); + + /* Position Word 1: Scaled Image Dimensions. + * Skipped due to SCALER_CTL0_UNITY scaling. + */ + + /* Position Word 2: Source Image Size, Alpha Mode */ + vc4_dlist_write(vc4_state, + VC4_SET_FIELD(format->has_alpha ? + SCALER_POS2_ALPHA_MODE_PIPELINE : + SCALER_POS2_ALPHA_MODE_FIXED, + SCALER_POS2_ALPHA_MODE) | + VC4_SET_FIELD(crtc_w, SCALER_POS2_WIDTH) | + VC4_SET_FIELD(crtc_h, SCALER_POS2_HEIGHT)); + + /* Position Word 3: Context. Written by the HVS. */ + vc4_dlist_write(vc4_state, 0xc0c0c0c0); + + /* Pointer Word 0: RGB / Y Pointer */ + vc4_dlist_write(vc4_state, bo->paddr + offset); + + /* Pointer Context Word 0: Written by the HVS */ + vc4_dlist_write(vc4_state, 0xc0c0c0c0); + + /* Pitch word 0: Pointer 0 Pitch */ + vc4_dlist_write(vc4_state, + VC4_SET_FIELD(fb->pitches[0], SCALER_SRC_PITCH)); + + vc4_state->dlist[ctl0_offset] |= + VC4_SET_FIELD(vc4_state->dlist_count, SCALER_CTL0_SIZE); + + return 0; +} + +/* If a modeset involves changing the setup of a plane, the atomic + * infrastructure will call this to validate a proposed plane setup. + * However, if a plane isn't getting updated, this (and the + * corresponding vc4_plane_atomic_update) won't get called. Thus, we + * compute the dlist here and have all active plane dlists get updated + * in the CRTC's flush. + */ +static int vc4_plane_atomic_check(struct drm_plane *plane, + struct drm_plane_state *state) +{ + struct vc4_plane_state *vc4_state = to_vc4_plane_state(state); + + vc4_state->dlist_count = 0; + + if (plane_enabled(state)) + return vc4_plane_mode_set(plane, state); + else + return 0; +} + +static void vc4_plane_atomic_update(struct drm_plane *plane, + struct drm_plane_state *old_state) +{ + /* No contents here. Since we don't know where in the CRTC's + * dlist we should be stored, our dlist is uploaded to the + * hardware with vc4_plane_write_dlist() at CRTC atomic_flush + * time. + */ +} + +u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist) +{ + struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state); + int i; + + /* Can't memcpy_toio() because it needs to be 32-bit writes. */ + for (i = 0; i < vc4_state->dlist_count; i++) + writel(vc4_state->dlist[i], &dlist[i]); + + return vc4_state->dlist_count; +} + +u32 vc4_plane_dlist_size(struct drm_plane_state *state) +{ + struct vc4_plane_state *vc4_state = to_vc4_plane_state(state); + + return vc4_state->dlist_count; +} + +static const struct drm_plane_helper_funcs vc4_plane_helper_funcs = { + .prepare_fb = NULL, + .cleanup_fb = NULL, + .atomic_check = vc4_plane_atomic_check, + .atomic_update = vc4_plane_atomic_update, +}; + +static void vc4_plane_destroy(struct drm_plane *plane) +{ + drm_plane_helper_disable(plane); + drm_plane_cleanup(plane); +} + +static const struct drm_plane_funcs vc4_plane_funcs = { + .update_plane = drm_atomic_helper_update_plane, + .disable_plane = drm_atomic_helper_disable_plane, + .destroy = vc4_plane_destroy, + .set_property = NULL, + .reset = vc4_plane_reset, + .atomic_duplicate_state = vc4_plane_duplicate_state, + .atomic_destroy_state = vc4_plane_destroy_state, +}; + +struct drm_plane *vc4_plane_init(struct drm_device *dev, + enum drm_plane_type type) +{ + struct drm_plane *plane = NULL; + struct vc4_plane *vc4_plane; + u32 formats[ARRAY_SIZE(hvs_formats)]; + int ret = 0; + unsigned i; + + vc4_plane = devm_kzalloc(dev->dev, sizeof(*vc4_plane), + GFP_KERNEL); + if (!vc4_plane) { + ret = -ENOMEM; + goto fail; + } + + for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) + formats[i] = hvs_formats[i].drm; + plane = &vc4_plane->base; + ret = drm_universal_plane_init(dev, plane, 0xff, + &vc4_plane_funcs, + formats, ARRAY_SIZE(formats), + type); + + drm_plane_helper_add(plane, &vc4_plane_helper_funcs); + + return plane; +fail: + if (plane) + vc4_plane_destroy(plane); + + return ERR_PTR(ret); +} |