/* * Copyright (C) 2015 Free Electrons * Copyright (C) 2015 NextThing Co * * Maxime Ripard * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sun4i_backend.h" #include "sun4i_drv.h" #include "sun4i_frontend.h" #include "sun4i_layer.h" #include "sunxi_engine.h" struct sun4i_backend_quirks { /* backend <-> TCON muxing selection done in backend */ bool needs_output_muxing; }; static const u32 sunxi_rgb2yuv_coef[12] = { 0x00000107, 0x00000204, 0x00000064, 0x00000108, 0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808, 0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808 }; static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine) { int i; DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n"); /* Set color correction */ regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG, SUN4I_BACKEND_OCCTL_ENABLE); for (i = 0; i < 12; i++) regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i), sunxi_rgb2yuv_coef[i]); } static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine) { DRM_DEBUG_DRIVER("Disabling color correction\n"); /* Disable color correction */ regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG, SUN4I_BACKEND_OCCTL_ENABLE, 0); } static void sun4i_backend_commit(struct sunxi_engine *engine) { DRM_DEBUG_DRIVER("Committing changes\n"); regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG, SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS | SUN4I_BACKEND_REGBUFFCTL_LOADCTL); } void sun4i_backend_layer_enable(struct sun4i_backend *backend, int layer, bool enable) { u32 val; DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis", layer); if (enable) val = SUN4I_BACKEND_MODCTL_LAY_EN(layer); else val = 0; regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, SUN4I_BACKEND_MODCTL_LAY_EN(layer), val); } static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane, u32 format, u32 *mode) { if (plane && (plane->type == DRM_PLANE_TYPE_PRIMARY) && (format == DRM_FORMAT_ARGB8888)) format = DRM_FORMAT_XRGB8888; switch (format) { case DRM_FORMAT_ARGB8888: *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888; break; case DRM_FORMAT_ARGB4444: *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444; break; case DRM_FORMAT_ARGB1555: *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555; break; case DRM_FORMAT_RGBA5551: *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551; break; case DRM_FORMAT_RGBA4444: *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444; break; case DRM_FORMAT_XRGB8888: *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888; break; case DRM_FORMAT_RGB888: *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888; break; case DRM_FORMAT_RGB565: *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565; break; default: return -EINVAL; } return 0; } int sun4i_backend_update_layer_coord(struct sun4i_backend *backend, int layer, struct drm_plane *plane) { struct drm_plane_state *state = plane->state; DRM_DEBUG_DRIVER("Updating layer %d\n", layer); if (plane->type == DRM_PLANE_TYPE_PRIMARY) { DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n", state->crtc_w, state->crtc_h); regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG, SUN4I_BACKEND_DISSIZE(state->crtc_w, state->crtc_h)); } /* Set height and width */ DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n", state->crtc_w, state->crtc_h); regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer), SUN4I_BACKEND_LAYSIZE(state->crtc_w, state->crtc_h)); /* Set base coordinates */ DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n", state->crtc_x, state->crtc_y); regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer), SUN4I_BACKEND_LAYCOOR(state->crtc_x, state->crtc_y)); return 0; } int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, int layer, struct drm_plane *plane) { struct drm_plane_state *state = plane->state; struct drm_framebuffer *fb = state->fb; bool interlaced = false; u32 val; int ret; if (plane->state->crtc) interlaced = plane->state->crtc->state->adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE; regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, SUN4I_BACKEND_MODCTL_ITLMOD_EN, interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0); DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n", interlaced ? "on" : "off"); ret = sun4i_backend_drm_format_to_layer(plane, fb->format->format, &val); if (ret) { DRM_DEBUG_DRIVER("Invalid format\n"); return ret; } regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG1(layer), SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); return 0; } int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend, int layer, uint32_t fmt) { u32 val; int ret; ret = sun4i_backend_drm_format_to_layer(NULL, fmt, &val); if (ret) { DRM_DEBUG_DRIVER("Invalid format\n"); return ret; } regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN, SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN); regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG1(layer), SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); return 0; } int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend, int layer, struct drm_plane *plane) { struct drm_plane_state *state = plane->state; struct drm_framebuffer *fb = state->fb; u32 lo_paddr, hi_paddr; dma_addr_t paddr; /* Set the line width */ DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYLINEWIDTH_REG(layer), fb->pitches[0] * 8); /* Get the start of the displayed memory */ paddr = drm_fb_cma_get_gem_addr(fb, state, 0); DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr); /* * backend DMA accesses DRAM directly, bypassing the system * bus. As such, the address range is different and the buffer * address needs to be corrected. */ paddr -= PHYS_OFFSET; /* Write the 32 lower bits of the address (in bits) */ lo_paddr = paddr << 3; DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr); regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYFB_L32ADD_REG(layer), lo_paddr); /* And the upper bits */ hi_paddr = paddr >> 29; DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr); regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer), SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr)); return 0; } int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer, struct drm_plane *plane) { struct drm_plane_state *state = plane->state; unsigned int priority = state->normalized_zpos; DRM_DEBUG_DRIVER("Setting layer %d's priority to %d\n", layer, priority); regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK, SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority)); return 0; } static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state) { u16 src_h = state->src_h >> 16; u16 src_w = state->src_w >> 16; DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n", src_w, src_h, state->crtc_w, state->crtc_h); if ((state->crtc_h != src_h) || (state->crtc_w != src_w)) return true; return false; } static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state) { struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane); struct sun4i_backend *backend = layer->backend; if (IS_ERR(backend->frontend)) return false; return sun4i_backend_plane_uses_scaler(state); } static void sun4i_backend_atomic_begin(struct sunxi_engine *engine, struct drm_crtc_state *old_state) { u32 val; WARN_ON(regmap_read_poll_timeout(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG, val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL), 100, 50000)); } static int sun4i_backend_atomic_check(struct sunxi_engine *engine, struct drm_crtc_state *crtc_state) { struct drm_atomic_state *state = crtc_state->state; struct drm_device *drm = state->dev; struct drm_plane *plane; unsigned int num_planes = 0; unsigned int num_alpha_planes = 0; unsigned int num_frontend_planes = 0; DRM_DEBUG_DRIVER("Starting checking our planes\n"); if (!crtc_state->planes_changed) return 0; drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) { struct drm_plane_state *plane_state = drm_atomic_get_plane_state(state, plane); struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(plane_state); struct drm_framebuffer *fb = plane_state->fb; struct drm_format_name_buf format_name; if (sun4i_backend_plane_uses_frontend(plane_state)) { DRM_DEBUG_DRIVER("Using the frontend for plane %d\n", plane->index); layer_state->uses_frontend = true; num_frontend_planes++; } else { layer_state->uses_frontend = false; } DRM_DEBUG_DRIVER("Plane FB format is %s\n", drm_get_format_name(fb->format->format, &format_name)); if (fb->format->has_alpha) num_alpha_planes++; num_planes++; } /* * The hardware is a bit unusual here. * * Even though it supports 4 layers, it does the composition * in two separate steps. * * The first one is assigning a layer to one of its two * pipes. If more that 1 layer is assigned to the same pipe, * and if pixels overlaps, the pipe will take the pixel from * the layer with the highest priority. * * The second step is the actual alpha blending, that takes * the two pipes as input, and uses the eventual alpha * component to do the transparency between the two. * * This two steps scenario makes us unable to guarantee a * robust alpha blending between the 4 layers in all * situations, since this means that we need to have one layer * with alpha at the lowest position of our two pipes. * * However, we cannot even do that, since the hardware has a * bug where the lowest plane of the lowest pipe (pipe 0, * priority 0), if it has any alpha, will discard the pixel * entirely and just display the pixels in the background * color (black by default). * * This means that we effectively have only three valid * configurations with alpha, all of them with the alpha being * on pipe1 with the lowest position, which can be 1, 2 or 3 * depending on the number of planes and their zpos. */ if (num_alpha_planes > SUN4I_BACKEND_NUM_ALPHA_LAYERS) { DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n"); return -EINVAL; } if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) { DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n"); return -EINVAL; } DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video\n", num_planes, num_alpha_planes, num_frontend_planes); return 0; } static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine) { struct sun4i_backend *backend = engine_to_sun4i_backend(engine); struct sun4i_frontend *frontend = backend->frontend; if (!frontend) return; /* * In a teardown scenario with the frontend involved, we have * to keep the frontend enabled until the next vblank, and * only then disable it. * * This is due to the fact that the backend will not take into * account the new configuration (with the plane that used to * be fed by the frontend now disabled) until we write to the * commit bit and the hardware fetches the new configuration * during the next vblank. * * So we keep the frontend around in order to prevent any * visual artifacts. */ spin_lock(&backend->frontend_lock); if (backend->frontend_teardown) { sun4i_frontend_exit(frontend); backend->frontend_teardown = false; } spin_unlock(&backend->frontend_lock); }; static int sun4i_backend_init_sat(struct device *dev) { struct sun4i_backend *backend = dev_get_drvdata(dev); int ret; backend->sat_reset = devm_reset_control_get(dev, "sat"); if (IS_ERR(backend->sat_reset)) { dev_err(dev, "Couldn't get the SAT reset line\n"); return PTR_ERR(backend->sat_reset); } ret = reset_control_deassert(backend->sat_reset); if (ret) { dev_err(dev, "Couldn't deassert the SAT reset line\n"); return ret; } backend->sat_clk = devm_clk_get(dev, "sat"); if (IS_ERR(backend->sat_clk)) { dev_err(dev, "Couldn't get our SAT clock\n"); ret = PTR_ERR(backend->sat_clk); goto err_assert_reset; } ret = clk_prepare_enable(backend->sat_clk); if (ret) { dev_err(dev, "Couldn't enable the SAT clock\n"); return ret; } return 0; err_assert_reset: reset_control_assert(backend->sat_reset); return ret; } static int sun4i_backend_free_sat(struct device *dev) { struct sun4i_backend *backend = dev_get_drvdata(dev); clk_disable_unprepare(backend->sat_clk); reset_control_assert(backend->sat_reset); return 0; } /* * The display backend can take video output from the display frontend, or * the display enhancement unit on the A80, as input for one it its layers. * This relationship within the display pipeline is encoded in the device * tree with of_graph, and we use it here to figure out which backend, if * there are 2 or more, we are currently probing. The number would be in * the "reg" property of the upstream output port endpoint. */ static int sun4i_backend_of_get_id(struct device_node *node) { struct device_node *port, *ep; int ret = -EINVAL; /* input is port 0 */ port = of_graph_get_port_by_id(node, 0); if (!port) return -EINVAL; /* try finding an upstream endpoint */ for_each_available_child_of_node(port, ep) { struct device_node *remote; u32 reg; remote = of_graph_get_remote_endpoint(ep); if (!remote) continue; ret = of_property_read_u32(remote, "reg", ®); if (ret) continue; ret = reg; } of_node_put(port); return ret; } /* TODO: This needs to take multiple pipelines into account */ static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv, struct device_node *node) { struct device_node *port, *ep, *remote; struct sun4i_frontend *frontend; port = of_graph_get_port_by_id(node, 0); if (!port) return ERR_PTR(-EINVAL); for_each_available_child_of_node(port, ep) { remote = of_graph_get_remote_port_parent(ep); if (!remote) continue; /* does this node match any registered engines? */ list_for_each_entry(frontend, &drv->frontend_list, list) { if (remote == frontend->node) { of_node_put(remote); of_node_put(port); return frontend; } } } return ERR_PTR(-EINVAL); } static const struct sunxi_engine_ops sun4i_backend_engine_ops = { .atomic_begin = sun4i_backend_atomic_begin, .atomic_check = sun4i_backend_atomic_check, .commit = sun4i_backend_commit, .layers_init = sun4i_layers_init, .apply_color_correction = sun4i_backend_apply_color_correction, .disable_color_correction = sun4i_backend_disable_color_correction, .vblank_quirk = sun4i_backend_vblank_quirk, }; static struct regmap_config sun4i_backend_regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .max_register = 0x5800, }; static int sun4i_backend_bind(struct device *dev, struct device *master, void *data) { struct platform_device *pdev = to_platform_device(dev); struct drm_device *drm = data; struct sun4i_drv *drv = drm->dev_private; struct sun4i_backend *backend; const struct sun4i_backend_quirks *quirks; struct resource *res; void __iomem *regs; int i, ret; backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL); if (!backend) return -ENOMEM; dev_set_drvdata(dev, backend); spin_lock_init(&backend->frontend_lock); backend->engine.node = dev->of_node; backend->engine.ops = &sun4i_backend_engine_ops; backend->engine.id = sun4i_backend_of_get_id(dev->of_node); if (backend->engine.id < 0) return backend->engine.id; backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); if (IS_ERR(backend->frontend)) dev_warn(dev, "Couldn't find matching frontend, frontend features disabled\n"); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); regs = devm_ioremap_resource(dev, res); if (IS_ERR(regs)) return PTR_ERR(regs); backend->reset = devm_reset_control_get(dev, NULL); if (IS_ERR(backend->reset)) { dev_err(dev, "Couldn't get our reset line\n"); return PTR_ERR(backend->reset); } ret = reset_control_deassert(backend->reset); if (ret) { dev_err(dev, "Couldn't deassert our reset line\n"); return ret; } backend->bus_clk = devm_clk_get(dev, "ahb"); if (IS_ERR(backend->bus_clk)) { dev_err(dev, "Couldn't get the backend bus clock\n"); ret = PTR_ERR(backend->bus_clk); goto err_assert_reset; } clk_prepare_enable(backend->bus_clk); backend->mod_clk = devm_clk_get(dev, "mod"); if (IS_ERR(backend->mod_clk)) { dev_err(dev, "Couldn't get the backend module clock\n"); ret = PTR_ERR(backend->mod_clk); goto err_disable_bus_clk; } clk_prepare_enable(backend->mod_clk); backend->ram_clk = devm_clk_get(dev, "ram"); if (IS_ERR(backend->ram_clk)) { dev_err(dev, "Couldn't get the backend RAM clock\n"); ret = PTR_ERR(backend->ram_clk); goto err_disable_mod_clk; } clk_prepare_enable(backend->ram_clk); if (of_device_is_compatible(dev->of_node, "allwinner,sun8i-a33-display-backend")) { ret = sun4i_backend_init_sat(dev); if (ret) { dev_err(dev, "Couldn't init SAT resources\n"); goto err_disable_ram_clk; } } backend->engine.regs = devm_regmap_init_mmio(dev, regs, &sun4i_backend_regmap_config); if (IS_ERR(backend->engine.regs)) { dev_err(dev, "Couldn't create the backend regmap\n"); return PTR_ERR(backend->engine.regs); } list_add_tail(&backend->engine.list, &drv->engine_list); /* * Many of the backend's layer configuration registers have * undefined default values. This poses a risk as we use * regmap_update_bits in some places, and don't overwrite * the whole register. * * Clear the registers here to have something predictable. */ for (i = 0x800; i < 0x1000; i += 4) regmap_write(backend->engine.regs, i, 0); /* Disable registers autoloading */ regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS); /* Enable the backend */ regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, SUN4I_BACKEND_MODCTL_DEBE_EN | SUN4I_BACKEND_MODCTL_START_CTL); /* Set output selection if needed */ quirks = of_device_get_match_data(dev); if (quirks->needs_output_muxing) { /* * We assume there is no dynamic muxing of backends * and TCONs, so we select the backend with same ID. * * While dynamic selection might be interesting, since * the CRTC is tied to the TCON, while the layers are * tied to the backends, this means, we will need to * switch between groups of layers. There might not be * a way to represent this constraint in DRM. */ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, SUN4I_BACKEND_MODCTL_OUT_SEL, (backend->engine.id ? SUN4I_BACKEND_MODCTL_OUT_LCD1 : SUN4I_BACKEND_MODCTL_OUT_LCD0)); } return 0; err_disable_ram_clk: clk_disable_unprepare(backend->ram_clk); err_disable_mod_clk: clk_disable_unprepare(backend->mod_clk); err_disable_bus_clk: clk_disable_unprepare(backend->bus_clk); err_assert_reset: reset_control_assert(backend->reset); return ret; } static void sun4i_backend_unbind(struct device *dev, struct device *master, void *data) { struct sun4i_backend *backend = dev_get_drvdata(dev); list_del(&backend->engine.list); if (of_device_is_compatible(dev->of_node, "allwinner,sun8i-a33-display-backend")) sun4i_backend_free_sat(dev); clk_disable_unprepare(backend->ram_clk); clk_disable_unprepare(backend->mod_clk); clk_disable_unprepare(backend->bus_clk); reset_control_assert(backend->reset); } static const struct component_ops sun4i_backend_ops = { .bind = sun4i_backend_bind, .unbind = sun4i_backend_unbind, }; static int sun4i_backend_probe(struct platform_device *pdev) { return component_add(&pdev->dev, &sun4i_backend_ops); } static int sun4i_backend_remove(struct platform_device *pdev) { component_del(&pdev->dev, &sun4i_backend_ops); return 0; } static const struct sun4i_backend_quirks sun4i_backend_quirks = { .needs_output_muxing = true, }; static const struct sun4i_backend_quirks sun5i_backend_quirks = { }; static const struct sun4i_backend_quirks sun6i_backend_quirks = { }; static const struct sun4i_backend_quirks sun7i_backend_quirks = { .needs_output_muxing = true, }; static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = { }; static const struct of_device_id sun4i_backend_of_table[] = { { .compatible = "allwinner,sun4i-a10-display-backend", .data = &sun4i_backend_quirks, }, { .compatible = "allwinner,sun5i-a13-display-backend", .data = &sun5i_backend_quirks, }, { .compatible = "allwinner,sun6i-a31-display-backend", .data = &sun6i_backend_quirks, }, { .compatible = "allwinner,sun7i-a20-display-backend", .data = &sun7i_backend_quirks, }, { .compatible = "allwinner,sun8i-a33-display-backend", .data = &sun8i_a33_backend_quirks, }, { } }; MODULE_DEVICE_TABLE(of, sun4i_backend_of_table); static struct platform_driver sun4i_backend_platform_driver = { .probe = sun4i_backend_probe, .remove = sun4i_backend_remove, .driver = { .name = "sun4i-backend", .of_match_table = sun4i_backend_of_table, }, }; module_platform_driver(sun4i_backend_platform_driver); MODULE_AUTHOR("Maxime Ripard "); MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver"); MODULE_LICENSE("GPL");