--- /dev/null
+/*
+ * 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;
+}
+
+static 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;
+}
+
+static 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. */
+static 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 (state->crtc_w << 16 != state->src_w ||
+ state->crtc_h << 16 != state->src_h) {
+ /* We don't support scaling yet, which involves
+ * allocating the LBM memory for scaling temporary
+ * storage, and putting filter kernels in the HVS
+ * context.
+ */
+ return -EINVAL;
+ }
+
+ 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);
+}
Code Review / kvmfornfv.git / blobdiff