/*
 * (C) Copyright 2023 Rockchip Electronics Co., Ltd
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <linux/hdmi.h>
#include <linux/compat.h>
#include "rockchip_display.h"
#include <spl_display.h>

#define RK_BLK_SIZE 512
#define BMP_PROCESSED_FLAG 8399

static uint32_t crc32_table[256];

void rockchip_display_make_crc32_table(void)
{
	uint32_t c;
	int n, k;
	unsigned long poly;		/* polynomial exclusive-or pattern */
	/* terms of polynomial defining this crc (except x^32): */
	static const char p[] = {0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26};

	/* make exclusive-or pattern from polynomial (0xedb88320L) */
	poly = 0L;
	for (n = 0; n < sizeof(p) / sizeof(char); n++)
		poly |= 1L << (31 - p[n]);

	for (n = 0; n < 256; n++) {
		c = (unsigned long)n;
		for (k = 0; k < 8; k++)
		c = c & 1 ? poly ^ (c >> 1) : c >> 1;
		crc32_table[n] = cpu_to_le32(c);
	}
}

uint32_t rockchip_display_crc32c_cal(unsigned char *data, int length)
{
	int i;
	uint32_t crc;
	crc = 0xFFFFFFFF;

	for (i = 0; i < length; i++) {
		crc = crc32_table[(crc ^ *data) & 0xff] ^ (crc >> 8);
		data++;
	}

	return crc ^ 0xffffffff;
}

/**
 * drm_mode_max_resolution_filter - mark modes out of vop max resolution
 * @edid_data: structure store mode list
 * @max_output: vop max output resolution
 */
void drm_mode_max_resolution_filter(struct hdmi_edid_data *edid_data,
				    struct vop_rect *max_output)
{
	int i;

	for (i = 0; i < edid_data->modes; i++) {
		if (edid_data->mode_buf[i].hdisplay > max_output->width ||
		    edid_data->mode_buf[i].vdisplay > max_output->height)
			edid_data->mode_buf[i].invalid = true;
	}
}

int drm_mode_vrefresh(const struct drm_display_mode *mode)
{
	int refresh = 0;
	unsigned int calc_val;

	if (mode->vrefresh > 0) {
		refresh = mode->vrefresh;
	} else if (mode->htotal > 0 && mode->vtotal > 0) {
		int vtotal;

		vtotal = mode->vtotal;
		/* work out vrefresh the value will be x1000 */
		calc_val = (mode->clock * 1000);
		calc_val /= mode->htotal;
		refresh = (calc_val + vtotal / 2) / vtotal;

		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
		refresh *= 2;
		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
		refresh /= 2;
		if (mode->vscan > 1)
		refresh /= mode->vscan;
	}
	return refresh;
}

/**
 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
 * @p: mode
 * @adjust_flags: a combination of adjustment flags
 *
 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
 *
 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
 *   interlaced modes.
 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
 *   buffers containing two eyes (only adjust the timings when needed, eg. for
 *   "frame packing" or "side by side full").
 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
 *   be performed for doublescan and vscan > 1 modes respectively.
 */
void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
{
	if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
		return;

	p->crtc_clock = p->clock;
	p->crtc_hdisplay = p->hdisplay;
	p->crtc_hsync_start = p->hsync_start;
	p->crtc_hsync_end = p->hsync_end;
	p->crtc_htotal = p->htotal;
	p->crtc_hskew = p->hskew;
	p->crtc_vdisplay = p->vdisplay;
	p->crtc_vsync_start = p->vsync_start;
	p->crtc_vsync_end = p->vsync_end;
	p->crtc_vtotal = p->vtotal;

	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
			p->crtc_vdisplay /= 2;
			p->crtc_vsync_start /= 2;
			p->crtc_vsync_end /= 2;
			p->crtc_vtotal /= 2;
		}
	}

	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
			p->crtc_vdisplay *= 2;
			p->crtc_vsync_start *= 2;
			p->crtc_vsync_end *= 2;
			p->crtc_vtotal *= 2;
		}
	}

	if (!(adjust_flags & CRTC_NO_VSCAN)) {
		if (p->vscan > 1) {
			p->crtc_vdisplay *= p->vscan;
			p->crtc_vsync_start *= p->vscan;
			p->crtc_vsync_end *= p->vscan;
			p->crtc_vtotal *= p->vscan;
		}
	}

	if (adjust_flags & CRTC_STEREO_DOUBLE) {
		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;

		switch (layout) {
		case DRM_MODE_FLAG_3D_FRAME_PACKING:
			p->crtc_clock *= 2;
			p->crtc_vdisplay += p->crtc_vtotal;
			p->crtc_vsync_start += p->crtc_vtotal;
			p->crtc_vsync_end += p->crtc_vtotal;
			p->crtc_vtotal += p->crtc_vtotal;
			break;
		}
	}

	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
}

/**
 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
 * output format
 *
 * @connector: drm connector under action.
 * @mode: video mode to be tested.
 *
 * Returns:
 * true if the mode can be supported in YCBCR420 format
 * false if not.
 */
static bool drm_mode_is_420_only(const struct drm_display_info *display,
			  struct drm_display_mode *mode)
{
	u8 vic = drm_match_cea_mode(mode);

	return test_bit(vic, display->hdmi.y420_vdb_modes);
}

/**
 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
 * output format also (along with RGB/YCBCR444/422)
 *
 * @display: display under action.
 * @mode: video mode to be tested.
 *
 * Returns:
 * true if the mode can be support YCBCR420 format
 * false if not.
 */
static bool drm_mode_is_420_also(const struct drm_display_info *display,
			  struct drm_display_mode *mode)
{
	u8 vic = drm_match_cea_mode(mode);

	return test_bit(vic, display->hdmi.y420_cmdb_modes);
}

/**
 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
 * output format
 *
 * @display: display under action.
 * @mode: video mode to be tested.
 *
 * Returns:
 * true if the mode can be supported in YCBCR420 format
 * false if not.
 */
bool drm_mode_is_420(const struct drm_display_info *display,
		     struct drm_display_mode *mode)
{
	return drm_mode_is_420_only(display, mode) ||
		drm_mode_is_420_also(display, mode);
}

static int display_rect_calc_scale(int src, int dst)
{
	int scale = 0;

	if (WARN_ON(src < 0 || dst < 0))
		return -EINVAL;

	if (dst == 0)
		return 0;

	src <<= 16;

	if (src > (dst << 16))
		return DIV_ROUND_UP(src, dst);
	else
		scale = src / dst;

	return scale;
}

int display_rect_calc_hscale(struct display_rect *src, struct display_rect *dst,
			     int min_hscale, int max_hscale)
{
	int hscale = display_rect_calc_scale(src->w, dst->w);

	if (hscale < 0 || dst->w == 0)
		return hscale;

	if (hscale < min_hscale || hscale > max_hscale)
		return -ERANGE;

	return hscale;
}

int display_rect_calc_vscale(struct display_rect *src, struct display_rect *dst,
			     int min_vscale, int max_vscale)
{
	int vscale = display_rect_calc_scale(src->h, dst->h);

	if (vscale < 0 || dst->h == 0)
		return vscale;

	if (vscale < min_vscale || vscale > max_vscale)
		return -ERANGE;

	return vscale;
}