summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/logicvc/logicvc_crtc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/logicvc/logicvc_crtc.c')
-rw-r--r--drivers/gpu/drm/logicvc/logicvc_crtc.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/gpu/drm/logicvc/logicvc_crtc.c b/drivers/gpu/drm/logicvc/logicvc_crtc.c
new file mode 100644
index 000000000000..c94bb9bb456b
--- /dev/null
+++ b/drivers/gpu/drm/logicvc/logicvc_crtc.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019-2022 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_print.h>
+#include <drm/drm_vblank.h>
+
+#include "logicvc_crtc.h"
+#include "logicvc_drm.h"
+#include "logicvc_interface.h"
+#include "logicvc_layer.h"
+#include "logicvc_regs.h"
+
+#define logicvc_crtc(c) \
+ container_of(c, struct logicvc_crtc, drm_crtc)
+
+static enum drm_mode_status
+logicvc_crtc_mode_valid(struct drm_crtc *drm_crtc,
+ const struct drm_display_mode *mode)
+{
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void logicvc_crtc_atomic_begin(struct drm_crtc *drm_crtc,
+ struct drm_atomic_state *state)
+{
+ struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
+ struct drm_crtc_state *old_state =
+ drm_atomic_get_old_crtc_state(state, drm_crtc);
+ struct drm_device *drm_dev = drm_crtc->dev;
+ unsigned long flags;
+
+ /*
+ * We need to grab the pending event here if vblank was already enabled
+ * since we won't get a call to atomic_enable to grab it.
+ */
+ if (drm_crtc->state->event && old_state->active) {
+ spin_lock_irqsave(&drm_dev->event_lock, flags);
+ WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
+
+ crtc->event = drm_crtc->state->event;
+ drm_crtc->state->event = NULL;
+
+ spin_unlock_irqrestore(&drm_dev->event_lock, flags);
+ }
+}
+
+static void logicvc_crtc_atomic_enable(struct drm_crtc *drm_crtc,
+ struct drm_atomic_state *state)
+{
+ struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
+ struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
+ struct drm_crtc_state *old_state =
+ drm_atomic_get_old_crtc_state(state, drm_crtc);
+ struct drm_crtc_state *new_state =
+ drm_atomic_get_new_crtc_state(state, drm_crtc);
+ struct drm_display_mode *mode = &new_state->adjusted_mode;
+
+ struct drm_device *drm_dev = drm_crtc->dev;
+ unsigned int hact, hfp, hsl, hbp;
+ unsigned int vact, vfp, vsl, vbp;
+ unsigned long flags;
+ u32 ctrl;
+
+ /* Timings */
+
+ hact = mode->hdisplay;
+ hfp = mode->hsync_start - mode->hdisplay;
+ hsl = mode->hsync_end - mode->hsync_start;
+ hbp = mode->htotal - mode->hsync_end;
+
+ vact = mode->vdisplay;
+ vfp = mode->vsync_start - mode->vdisplay;
+ vsl = mode->vsync_end - mode->vsync_start;
+ vbp = mode->vtotal - mode->vsync_end;
+
+ regmap_write(logicvc->regmap, LOGICVC_HSYNC_FRONT_PORCH_REG, hfp - 1);
+ regmap_write(logicvc->regmap, LOGICVC_HSYNC_REG, hsl - 1);
+ regmap_write(logicvc->regmap, LOGICVC_HSYNC_BACK_PORCH_REG, hbp - 1);
+ regmap_write(logicvc->regmap, LOGICVC_HRES_REG, hact - 1);
+
+ regmap_write(logicvc->regmap, LOGICVC_VSYNC_FRONT_PORCH_REG, vfp - 1);
+ regmap_write(logicvc->regmap, LOGICVC_VSYNC_REG, vsl - 1);
+ regmap_write(logicvc->regmap, LOGICVC_VSYNC_BACK_PORCH_REG, vbp - 1);
+ regmap_write(logicvc->regmap, LOGICVC_VRES_REG, vact - 1);
+
+ /* Signals */
+
+ ctrl = LOGICVC_CTRL_HSYNC_ENABLE | LOGICVC_CTRL_VSYNC_ENABLE |
+ LOGICVC_CTRL_DE_ENABLE;
+
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ ctrl |= LOGICVC_CTRL_HSYNC_INVERT;
+
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ ctrl |= LOGICVC_CTRL_VSYNC_INVERT;
+
+ if (logicvc->interface) {
+ struct drm_connector *connector =
+ &logicvc->interface->drm_connector;
+ struct drm_display_info *display_info =
+ &connector->display_info;
+
+ if (display_info->bus_flags & DRM_BUS_FLAG_DE_LOW)
+ ctrl |= LOGICVC_CTRL_DE_INVERT;
+
+ if (display_info->bus_flags &
+ DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
+ ctrl |= LOGICVC_CTRL_CLOCK_INVERT;
+ }
+
+ regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
+ LOGICVC_CTRL_HSYNC_ENABLE |
+ LOGICVC_CTRL_HSYNC_INVERT |
+ LOGICVC_CTRL_VSYNC_ENABLE |
+ LOGICVC_CTRL_VSYNC_INVERT |
+ LOGICVC_CTRL_DE_ENABLE |
+ LOGICVC_CTRL_DE_INVERT |
+ LOGICVC_CTRL_PIXEL_INVERT |
+ LOGICVC_CTRL_CLOCK_INVERT, ctrl);
+
+ /* Generate internal state reset. */
+ regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
+
+ drm_crtc_vblank_on(drm_crtc);
+
+ /* Register our event after vblank is enabled. */
+ if (drm_crtc->state->event && !old_state->active) {
+ spin_lock_irqsave(&drm_dev->event_lock, flags);
+ WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
+
+ crtc->event = drm_crtc->state->event;
+ drm_crtc->state->event = NULL;
+ spin_unlock_irqrestore(&drm_dev->event_lock, flags);
+ }
+}
+
+static void logicvc_crtc_atomic_disable(struct drm_crtc *drm_crtc,
+ struct drm_atomic_state *state)
+{
+ struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
+ struct drm_device *drm_dev = drm_crtc->dev;
+
+ drm_crtc_vblank_off(drm_crtc);
+
+ /* Disable and clear CRTC bits. */
+ regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
+ LOGICVC_CTRL_HSYNC_ENABLE |
+ LOGICVC_CTRL_HSYNC_INVERT |
+ LOGICVC_CTRL_VSYNC_ENABLE |
+ LOGICVC_CTRL_VSYNC_INVERT |
+ LOGICVC_CTRL_DE_ENABLE |
+ LOGICVC_CTRL_DE_INVERT |
+ LOGICVC_CTRL_PIXEL_INVERT |
+ LOGICVC_CTRL_CLOCK_INVERT, 0);
+
+ /* Generate internal state reset. */
+ regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
+
+ /* Consume any leftover event since vblank is now disabled. */
+ if (drm_crtc->state->event && !drm_crtc->state->active) {
+ spin_lock_irq(&drm_dev->event_lock);
+
+ drm_crtc_send_vblank_event(drm_crtc, drm_crtc->state->event);
+ drm_crtc->state->event = NULL;
+ spin_unlock_irq(&drm_dev->event_lock);
+ }
+}
+
+static const struct drm_crtc_helper_funcs logicvc_crtc_helper_funcs = {
+ .mode_valid = logicvc_crtc_mode_valid,
+ .atomic_begin = logicvc_crtc_atomic_begin,
+ .atomic_enable = logicvc_crtc_atomic_enable,
+ .atomic_disable = logicvc_crtc_atomic_disable,
+};
+
+static int logicvc_crtc_enable_vblank(struct drm_crtc *drm_crtc)
+{
+ struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
+
+ /* Clear any pending V_SYNC interrupt. */
+ regmap_write_bits(logicvc->regmap, LOGICVC_INT_STAT_REG,
+ LOGICVC_INT_STAT_V_SYNC, LOGICVC_INT_STAT_V_SYNC);
+
+ /* Unmask V_SYNC interrupt. */
+ regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
+ LOGICVC_INT_MASK_V_SYNC, 0);
+
+ return 0;
+}
+
+static void logicvc_crtc_disable_vblank(struct drm_crtc *drm_crtc)
+{
+ struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
+
+ /* Mask V_SYNC interrupt. */
+ regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
+ LOGICVC_INT_MASK_V_SYNC, LOGICVC_INT_MASK_V_SYNC);
+}
+
+static const struct drm_crtc_funcs logicvc_crtc_funcs = {
+ .reset = drm_atomic_helper_crtc_reset,
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+ .enable_vblank = logicvc_crtc_enable_vblank,
+ .disable_vblank = logicvc_crtc_disable_vblank,
+};
+
+void logicvc_crtc_vblank_handler(struct logicvc_drm *logicvc)
+{
+ struct drm_device *drm_dev = &logicvc->drm_dev;
+ struct logicvc_crtc *crtc = logicvc->crtc;
+ unsigned long flags;
+
+ if (!crtc)
+ return;
+
+ drm_crtc_handle_vblank(&crtc->drm_crtc);
+
+ if (crtc->event) {
+ spin_lock_irqsave(&drm_dev->event_lock, flags);
+ drm_crtc_send_vblank_event(&crtc->drm_crtc, crtc->event);
+ drm_crtc_vblank_put(&crtc->drm_crtc);
+ crtc->event = NULL;
+ spin_unlock_irqrestore(&drm_dev->event_lock, flags);
+ }
+}
+
+int logicvc_crtc_init(struct logicvc_drm *logicvc)
+{
+ struct drm_device *drm_dev = &logicvc->drm_dev;
+ struct device *dev = drm_dev->dev;
+ struct device_node *of_node = dev->of_node;
+ struct logicvc_crtc *crtc;
+ struct logicvc_layer *layer_primary;
+ int ret;
+
+ crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
+ if (!crtc)
+ return -ENOMEM;
+
+ layer_primary = logicvc_layer_get_primary(logicvc);
+ if (!layer_primary) {
+ drm_err(drm_dev, "Failed to get primary layer\n");
+ return -EINVAL;
+ }
+
+ ret = drm_crtc_init_with_planes(drm_dev, &crtc->drm_crtc,
+ &layer_primary->drm_plane, NULL,
+ &logicvc_crtc_funcs, NULL);
+ if (ret) {
+ drm_err(drm_dev, "Failed to initialize CRTC\n");
+ return ret;
+ }
+
+ drm_crtc_helper_add(&crtc->drm_crtc, &logicvc_crtc_helper_funcs);
+
+ crtc->drm_crtc.port = of_graph_get_port_by_id(of_node, 1);
+
+ logicvc->crtc = crtc;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-17 14:24:12 +0000