From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 545 +++++++++++++++++++++++++
 1 file changed, 545 insertions(+)
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c

(limited to 'drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c')

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
new file mode 100644
index 000000000..58184cd6a
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -0,0 +1,545 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/media-bus-format.h>
+#include <linux/mfd/atmel-hlcdc.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+#include <video/videomode.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "atmel_hlcdc_dc.h"
+
+/**
+ * struct atmel_hlcdc_crtc_state - Atmel HLCDC CRTC state structure
+ *
+ * @base: base CRTC state
+ * @output_mode: RGBXXX output mode
+ */
+struct atmel_hlcdc_crtc_state {
+	struct drm_crtc_state base;
+	unsigned int output_mode;
+};
+
+static inline struct atmel_hlcdc_crtc_state *
+drm_crtc_state_to_atmel_hlcdc_crtc_state(struct drm_crtc_state *state)
+{
+	return container_of(state, struct atmel_hlcdc_crtc_state, base);
+}
+
+/**
+ * struct atmel_hlcdc_crtc - Atmel HLCDC CRTC structure
+ *
+ * @base: base DRM CRTC structure
+ * @dc: pointer to the atmel_hlcdc structure provided by the MFD device
+ * @event: pointer to the current page flip event
+ * @id: CRTC id (returned by drm_crtc_index)
+ */
+struct atmel_hlcdc_crtc {
+	struct drm_crtc base;
+	struct atmel_hlcdc_dc *dc;
+	struct drm_pending_vblank_event *event;
+	int id;
+};
+
+static inline struct atmel_hlcdc_crtc *
+drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct atmel_hlcdc_crtc, base);
+}
+
+static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->dc->hlcdc->regmap;
+	struct drm_display_mode *adj = &c->state->adjusted_mode;
+	struct atmel_hlcdc_crtc_state *state;
+	unsigned long mode_rate;
+	struct videomode vm;
+	unsigned long prate;
+	unsigned int mask = ATMEL_HLCDC_CLKDIV_MASK | ATMEL_HLCDC_CLKPOL;
+	unsigned int cfg = 0;
+	int div, ret;
+
+	ret = clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
+	if (ret)
+		return;
+
+	vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
+	vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
+	vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
+	vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
+	vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
+	vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(1),
+		     (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(2),
+		     (vm.vfront_porch - 1) | (vm.vback_porch << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(3),
+		     (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(4),
+		     (adj->crtc_hdisplay - 1) |
+		     ((adj->crtc_vdisplay - 1) << 16));
+
+	prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
+	mode_rate = adj->crtc_clock * 1000;
+	if (!crtc->dc->desc->fixed_clksrc) {
+		prate *= 2;
+		cfg |= ATMEL_HLCDC_CLKSEL;
+		mask |= ATMEL_HLCDC_CLKSEL;
+	}
+
+	div = DIV_ROUND_UP(prate, mode_rate);
+	if (div < 2) {
+		div = 2;
+	} else if (ATMEL_HLCDC_CLKDIV(div) & ~ATMEL_HLCDC_CLKDIV_MASK) {
+		/* The divider ended up too big, try a lower base rate. */
+		cfg &= ~ATMEL_HLCDC_CLKSEL;
+		prate /= 2;
+		div = DIV_ROUND_UP(prate, mode_rate);
+		if (ATMEL_HLCDC_CLKDIV(div) & ~ATMEL_HLCDC_CLKDIV_MASK)
+			div = ATMEL_HLCDC_CLKDIV_MASK;
+	} else {
+		int div_low = prate / mode_rate;
+
+		if (div_low >= 2 &&
+		    (10 * (prate / div_low - mode_rate) <
+		     (mode_rate - prate / div)))
+			/*
+			 * At least 10 times better when using a higher
+			 * frequency than requested, instead of a lower.
+			 * So, go with that.
+			 */
+			div = div_low;
+	}
+
+	cfg |= ATMEL_HLCDC_CLKDIV(div);
+
+	regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0), mask, cfg);
+
+	state = drm_crtc_state_to_atmel_hlcdc_crtc_state(c->state);
+	cfg = state->output_mode << 8;
+
+	if (adj->flags & DRM_MODE_FLAG_NVSYNC)
+		cfg |= ATMEL_HLCDC_VSPOL;
+
+	if (adj->flags & DRM_MODE_FLAG_NHSYNC)
+		cfg |= ATMEL_HLCDC_HSPOL;
+
+	regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
+			   ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL |
+			   ATMEL_HLCDC_VSPDLYS | ATMEL_HLCDC_VSPDLYE |
+			   ATMEL_HLCDC_DISPPOL | ATMEL_HLCDC_DISPDLY |
+			   ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO |
+			   ATMEL_HLCDC_GUARDTIME_MASK | ATMEL_HLCDC_MODE_MASK,
+			   cfg);
+
+	clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
+}
+
+static enum drm_mode_status
+atmel_hlcdc_crtc_mode_valid(struct drm_crtc *c,
+			    const struct drm_display_mode *mode)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+
+	return atmel_hlcdc_dc_mode_valid(crtc->dc, mode);
+}
+
+static void atmel_hlcdc_crtc_atomic_disable(struct drm_crtc *c,
+					    struct drm_atomic_state *state)
+{
+	struct drm_device *dev = c->dev;
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->dc->hlcdc->regmap;
+	unsigned int status;
+
+	drm_crtc_vblank_off(c);
+
+	pm_runtime_get_sync(dev->dev);
+
+	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       (status & ATMEL_HLCDC_DISP))
+		cpu_relax();
+
+	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       (status & ATMEL_HLCDC_SYNC))
+		cpu_relax();
+
+	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       (status & ATMEL_HLCDC_PIXEL_CLK))
+		cpu_relax();
+
+	clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
+	pinctrl_pm_select_sleep_state(dev->dev);
+
+	pm_runtime_allow(dev->dev);
+
+	pm_runtime_put_sync(dev->dev);
+}
+
+static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
+					   struct drm_atomic_state *state)
+{
+	struct drm_device *dev = c->dev;
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->dc->hlcdc->regmap;
+	unsigned int status;
+
+	pm_runtime_get_sync(dev->dev);
+
+	pm_runtime_forbid(dev->dev);
+
+	pinctrl_pm_select_default_state(dev->dev);
+	clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
+
+	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       !(status & ATMEL_HLCDC_PIXEL_CLK))
+		cpu_relax();
+
+
+	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       !(status & ATMEL_HLCDC_SYNC))
+		cpu_relax();
+
+	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
+	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+	       !(status & ATMEL_HLCDC_DISP))
+		cpu_relax();
+
+	pm_runtime_put_sync(dev->dev);
+
+}
+
+#define ATMEL_HLCDC_RGB444_OUTPUT	BIT(0)
+#define ATMEL_HLCDC_RGB565_OUTPUT	BIT(1)
+#define ATMEL_HLCDC_RGB666_OUTPUT	BIT(2)
+#define ATMEL_HLCDC_RGB888_OUTPUT	BIT(3)
+#define ATMEL_HLCDC_OUTPUT_MODE_MASK	GENMASK(3, 0)
+
+static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
+{
+	struct drm_connector *connector = state->connector;
+	struct drm_display_info *info = &connector->display_info;
+	struct drm_encoder *encoder;
+	unsigned int supported_fmts = 0;
+	int j;
+
+	encoder = state->best_encoder;
+	if (!encoder)
+		encoder = connector->encoder;
+
+	switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
+	case 0:
+		break;
+	case MEDIA_BUS_FMT_RGB444_1X12:
+		return ATMEL_HLCDC_RGB444_OUTPUT;
+	case MEDIA_BUS_FMT_RGB565_1X16:
+		return ATMEL_HLCDC_RGB565_OUTPUT;
+	case MEDIA_BUS_FMT_RGB666_1X18:
+		return ATMEL_HLCDC_RGB666_OUTPUT;
+	case MEDIA_BUS_FMT_RGB888_1X24:
+		return ATMEL_HLCDC_RGB888_OUTPUT;
+	default:
+		return -EINVAL;
+	}
+
+	for (j = 0; j < info->num_bus_formats; j++) {
+		switch (info->bus_formats[j]) {
+		case MEDIA_BUS_FMT_RGB444_1X12:
+			supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
+			break;
+		case MEDIA_BUS_FMT_RGB565_1X16:
+			supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
+			break;
+		case MEDIA_BUS_FMT_RGB666_1X18:
+			supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
+			break;
+		case MEDIA_BUS_FMT_RGB888_1X24:
+			supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
+			break;
+		default:
+			break;
+		}
+	}
+
+	return supported_fmts;
+}
+
+static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
+{
+	unsigned int output_fmts = ATMEL_HLCDC_OUTPUT_MODE_MASK;
+	struct atmel_hlcdc_crtc_state *hstate;
+	struct drm_connector_state *cstate;
+	struct drm_connector *connector;
+	struct atmel_hlcdc_crtc *crtc;
+	int i;
+
+	crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
+
+	for_each_new_connector_in_state(state->state, connector, cstate, i) {
+		unsigned int supported_fmts = 0;
+
+		if (!cstate->crtc)
+			continue;
+
+		supported_fmts = atmel_hlcdc_connector_output_mode(cstate);
+
+		if (crtc->dc->desc->conflicting_output_formats)
+			output_fmts &= supported_fmts;
+		else
+			output_fmts |= supported_fmts;
+	}
+
+	if (!output_fmts)
+		return -EINVAL;
+
+	hstate = drm_crtc_state_to_atmel_hlcdc_crtc_state(state);
+	hstate->output_mode = fls(output_fmts) - 1;
+
+	return 0;
+}
+
+static int atmel_hlcdc_crtc_atomic_check(struct drm_crtc *c,
+					 struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *s = drm_atomic_get_new_crtc_state(state, c);
+	int ret;
+
+	ret = atmel_hlcdc_crtc_select_output_mode(s);
+	if (ret)
+		return ret;
+
+	ret = atmel_hlcdc_plane_prepare_disc_area(s);
+	if (ret)
+		return ret;
+
+	return atmel_hlcdc_plane_prepare_ahb_routing(s);
+}
+
+static void atmel_hlcdc_crtc_atomic_begin(struct drm_crtc *c,
+					  struct drm_atomic_state *state)
+{
+	drm_crtc_vblank_on(c);
+}
+
+static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *c,
+					  struct drm_atomic_state *state)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	unsigned long flags;
+
+	spin_lock_irqsave(&c->dev->event_lock, flags);
+
+	if (c->state->event) {
+		c->state->event->pipe = drm_crtc_index(c);
+
+		WARN_ON(drm_crtc_vblank_get(c) != 0);
+
+		crtc->event = c->state->event;
+		c->state->event = NULL;
+	}
+	spin_unlock_irqrestore(&c->dev->event_lock, flags);
+}
+
+static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
+	.mode_valid = atmel_hlcdc_crtc_mode_valid,
+	.mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb,
+	.atomic_check = atmel_hlcdc_crtc_atomic_check,
+	.atomic_begin = atmel_hlcdc_crtc_atomic_begin,
+	.atomic_flush = atmel_hlcdc_crtc_atomic_flush,
+	.atomic_enable = atmel_hlcdc_crtc_atomic_enable,
+	.atomic_disable = atmel_hlcdc_crtc_atomic_disable,
+};
+
+static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+
+	drm_crtc_cleanup(c);
+	kfree(crtc);
+}
+
+static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc)
+{
+	struct drm_device *dev = crtc->base.dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+	if (crtc->event) {
+		drm_crtc_send_vblank_event(&crtc->base, crtc->event);
+		drm_crtc_vblank_put(&crtc->base);
+		crtc->event = NULL;
+	}
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
+{
+	drm_crtc_handle_vblank(c);
+	atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
+}
+
+static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
+{
+	struct atmel_hlcdc_crtc_state *state;
+
+	if (crtc->state) {
+		__drm_atomic_helper_crtc_destroy_state(crtc->state);
+		state = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
+		kfree(state);
+		crtc->state = NULL;
+	}
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
+static struct drm_crtc_state *
+atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct atmel_hlcdc_crtc_state *state, *cur;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	state = kmalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
+
+	cur = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
+	state->output_mode = cur->output_mode;
+
+	return &state->base;
+}
+
+static void atmel_hlcdc_crtc_destroy_state(struct drm_crtc *crtc,
+					   struct drm_crtc_state *s)
+{
+	struct atmel_hlcdc_crtc_state *state;
+
+	state = drm_crtc_state_to_atmel_hlcdc_crtc_state(s);
+	__drm_atomic_helper_crtc_destroy_state(s);
+	kfree(state);
+}
+
+static int atmel_hlcdc_crtc_enable_vblank(struct drm_crtc *c)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->dc->hlcdc->regmap;
+
+	/* Enable SOF (Start Of Frame) interrupt for vblank counting */
+	regmap_write(regmap, ATMEL_HLCDC_IER, ATMEL_HLCDC_SOF);
+
+	return 0;
+}
+
+static void atmel_hlcdc_crtc_disable_vblank(struct drm_crtc *c)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->dc->hlcdc->regmap;
+
+	regmap_write(regmap, ATMEL_HLCDC_IDR, ATMEL_HLCDC_SOF);
+}
+
+static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
+	.page_flip = drm_atomic_helper_page_flip,
+	.set_config = drm_atomic_helper_set_config,
+	.destroy = atmel_hlcdc_crtc_destroy,
+	.reset = atmel_hlcdc_crtc_reset,
+	.atomic_duplicate_state =  atmel_hlcdc_crtc_duplicate_state,
+	.atomic_destroy_state = atmel_hlcdc_crtc_destroy_state,
+	.enable_vblank = atmel_hlcdc_crtc_enable_vblank,
+	.disable_vblank = atmel_hlcdc_crtc_disable_vblank,
+};
+
+int atmel_hlcdc_crtc_create(struct drm_device *dev)
+{
+	struct atmel_hlcdc_plane *primary = NULL, *cursor = NULL;
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct atmel_hlcdc_crtc *crtc;
+	int ret;
+	int i;
+
+	crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
+	if (!crtc)
+		return -ENOMEM;
+
+	crtc->dc = dc;
+
+	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
+		if (!dc->layers[i])
+			continue;
+
+		switch (dc->layers[i]->desc->type) {
+		case ATMEL_HLCDC_BASE_LAYER:
+			primary = atmel_hlcdc_layer_to_plane(dc->layers[i]);
+			break;
+
+		case ATMEL_HLCDC_CURSOR_LAYER:
+			cursor = atmel_hlcdc_layer_to_plane(dc->layers[i]);
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	ret = drm_crtc_init_with_planes(dev, &crtc->base, &primary->base,
+					&cursor->base, &atmel_hlcdc_crtc_funcs,
+					NULL);
+	if (ret < 0)
+		goto fail;
+
+	crtc->id = drm_crtc_index(&crtc->base);
+
+	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
+		struct atmel_hlcdc_plane *overlay;
+
+		if (dc->layers[i] &&
+		    dc->layers[i]->desc->type == ATMEL_HLCDC_OVERLAY_LAYER) {
+			overlay = atmel_hlcdc_layer_to_plane(dc->layers[i]);
+			overlay->base.possible_crtcs = 1 << crtc->id;
+		}
+	}
+
+	drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
+
+	drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE);
+	drm_crtc_enable_color_mgmt(&crtc->base, 0, false,
+				   ATMEL_HLCDC_CLUT_SIZE);
+
+	dc->crtc = &crtc->base;
+
+	return 0;
+
+fail:
+	atmel_hlcdc_crtc_destroy(&crtc->base);
+	return ret;
+}
-- 
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