path: root/drivers/gpu/drm/radeon/rs690.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include "drmP.h"
#include "radeon_reg.h"
#include "radeon.h"
#include "rs690r.h"
#include "atom.h"
#include "atom-bits.h"

/* rs690,rs740 depends on : */
void r100_hdp_reset(struct radeon_device *rdev);
int r300_mc_wait_for_idle(struct radeon_device *rdev);
void r420_pipes_init(struct radeon_device *rdev);
void rs400_gart_disable(struct radeon_device *rdev);
int rs400_gart_enable(struct radeon_device *rdev);
void rs400_gart_adjust_size(struct radeon_device *rdev);
void rs600_mc_disable_clients(struct radeon_device *rdev);
void rs600_disable_vga(struct radeon_device *rdev);

/* This files gather functions specifics to :
 * rs690,rs740
 *
 * Some of these functions might be used by newer ASICs.
 */
void rs690_gpu_init(struct radeon_device *rdev);
int rs690_mc_wait_for_idle(struct radeon_device *rdev);


/*
 * MC functions.
 */
int rs690_mc_init(struct radeon_device *rdev)
{
	uint32_t tmp;
	int r;

	if (r100_debugfs_rbbm_init(rdev)) {
		DRM_ERROR("Failed to register debugfs file for RBBM !\n");
	}

	rs690_gpu_init(rdev);
	rs400_gart_disable(rdev);

	/* Setup GPU memory space */
	rdev->mc.gtt_location = rdev->mc.mc_vram_size;
	rdev->mc.gtt_location += (rdev->mc.gtt_size - 1);
	rdev->mc.gtt_location &= ~(rdev->mc.gtt_size - 1);
	rdev->mc.vram_location = 0xFFFFFFFFUL;
	r = radeon_mc_setup(rdev);
	if (r) {
		return r;
	}

	/* Program GPU memory space */
	rs600_mc_disable_clients(rdev);
	if (rs690_mc_wait_for_idle(rdev)) {
		printk(KERN_WARNING "Failed to wait MC idle while "
		       "programming pipes. Bad things might happen.\n");
	}
	tmp = rdev->mc.vram_location + rdev->mc.mc_vram_size - 1;
	tmp = REG_SET(RS690_MC_FB_TOP, tmp >> 16);
	tmp |= REG_SET(RS690_MC_FB_START, rdev->mc.vram_location >> 16);
	WREG32_MC(RS690_MCCFG_FB_LOCATION, tmp);
	/* FIXME: Does this reg exist on RS480,RS740 ? */
	WREG32(0x310, rdev->mc.vram_location);
	WREG32(RS690_HDP_FB_LOCATION, rdev->mc.vram_location >> 16);
	return 0;
}

void rs690_mc_fini(struct radeon_device *rdev)
{
	rs400_gart_disable(rdev);
	radeon_gart_table_ram_free(rdev);
	radeon_gart_fini(rdev);
}


/*
 * Global GPU functions
 */
int rs690_mc_wait_for_idle(struct radeon_device *rdev)
{
	unsigned i;
	uint32_t tmp;

	for (i = 0; i < rdev->usec_timeout; i++) {
		/* read MC_STATUS */
		tmp = RREG32_MC(RS690_MC_STATUS);
		if (tmp & RS690_MC_STATUS_IDLE) {
			return 0;
		}
		DRM_UDELAY(1);
	}
	return -1;
}

void rs690_errata(struct radeon_device *rdev)
{
	rdev->pll_errata = 0;
}

void rs690_gpu_init(struct radeon_device *rdev)
{
	/* FIXME: HDP same place on rs690 ? */
	r100_hdp_reset(rdev);
	rs600_disable_vga(rdev);
	/* FIXME: is this correct ? */
	r420_pipes_init(rdev);
	if (rs690_mc_wait_for_idle(rdev)) {
		printk(KERN_WARNING "Failed to wait MC idle while "
		       "programming pipes. Bad things might happen.\n");
	}
}


/*
 * VRAM info.
 */
void rs690_pm_info(struct radeon_device *rdev)
{
	int index = GetIndexIntoMasterTable(DATA, IntegratedSystemInfo);
	struct _ATOM_INTEGRATED_SYSTEM_INFO *info;
	struct _ATOM_INTEGRATED_SYSTEM_INFO_V2 *info_v2;
	void *ptr;
	uint16_t data_offset;
	uint8_t frev, crev;
	fixed20_12 tmp;

	atom_parse_data_header(rdev->mode_info.atom_context, index, NULL,
			       &frev, &crev, &data_offset);
	ptr = rdev->mode_info.atom_context->bios + data_offset;
	info = (struct _ATOM_INTEGRATED_SYSTEM_INFO *)ptr;
	info_v2 = (struct _ATOM_INTEGRATED_SYSTEM_INFO_V2 *)ptr;
	/* Get various system informations from bios */
	switch (crev) {
	case 1:
		tmp.full = rfixed_const(100);
		rdev->pm.igp_sideport_mclk.full = rfixed_const(info->ulBootUpMemoryClock);
		rdev->pm.igp_sideport_mclk.full = rfixed_div(rdev->pm.igp_sideport_mclk, tmp);
		rdev->pm.igp_system_mclk.full = rfixed_const(le16_to_cpu(info->usK8MemoryClock));
		rdev->pm.igp_ht_link_clk.full = rfixed_const(le16_to_cpu(info->usFSBClock));
		rdev->pm.igp_ht_link_width.full = rfixed_const(info->ucHTLinkWidth);
		break;
	case 2:
		tmp.full = rfixed_const(100);
		rdev->pm.igp_sideport_mclk.full = rfixed_const(info_v2->ulBootUpSidePortClock);
		rdev->pm.igp_sideport_mclk.full = rfixed_div(rdev->pm.igp_sideport_mclk, tmp);
		rdev->pm.igp_system_mclk.full = rfixed_const(info_v2->ulBootUpUMAClock);
		rdev->pm.igp_system_mclk.full = rfixed_div(rdev->pm.igp_system_mclk, tmp);
		rdev->pm.igp_ht_link_clk.full = rfixed_const(info_v2->ulHTLinkFreq);
		rdev->pm.igp_ht_link_clk.full = rfixed_div(rdev->pm.igp_ht_link_clk, tmp);
		rdev->pm.igp_ht_link_width.full = rfixed_const(le16_to_cpu(info_v2->usMinHTLinkWidth));
		break;
	default:
		tmp.full = rfixed_const(100);
		/* We assume the slower possible clock ie worst case */
		/* DDR 333Mhz */
		rdev->pm.igp_sideport_mclk.full = rfixed_const(333);
		/* FIXME: system clock ? */
		rdev->pm.igp_system_mclk.full = rfixed_const(100);
		rdev->pm.igp_system_mclk.full = rfixed_div(rdev->pm.igp_system_mclk, tmp);
		rdev->pm.igp_ht_link_clk.full = rfixed_const(200);
		rdev->pm.igp_ht_link_width.full = rfixed_const(8);
		DRM_ERROR("No integrated system info for your GPU, using safe default\n");
		break;
	}
	/* Compute various bandwidth */
	/* k8_bandwidth = (memory_clk / 2) * 2 * 8 * 0.5 = memory_clk * 4  */
	tmp.full = rfixed_const(4);
	rdev->pm.k8_bandwidth.full = rfixed_mul(rdev->pm.igp_system_mclk, tmp);
	/* ht_bandwidth = ht_clk * 2 * ht_width / 8 * 0.8
	 *              = ht_clk * ht_width / 5
	 */
	tmp.full = rfixed_const(5);
	rdev->pm.ht_bandwidth.full = rfixed_mul(rdev->pm.igp_ht_link_clk,
						rdev->pm.igp_ht_link_width);
	rdev->pm.ht_bandwidth.full = rfixed_div(rdev->pm.ht_bandwidth, tmp);
	if (tmp.full < rdev->pm.max_bandwidth.full) {
		/* HT link is a limiting factor */
		rdev->pm.max_bandwidth.full = tmp.full;
	}
	/* sideport_bandwidth = (sideport_clk / 2) * 2 * 2 * 0.7
	 *                    = (sideport_clk * 14) / 10
	 */
	tmp.full = rfixed_const(14);
	rdev->pm.sideport_bandwidth.full = rfixed_mul(rdev->pm.igp_sideport_mclk, tmp);
	tmp.full = rfixed_const(10);
	rdev->pm.sideport_bandwidth.full = rfixed_div(rdev->pm.sideport_bandwidth, tmp);
}

void rs690_vram_info(struct radeon_device *rdev)
{
	uint32_t tmp;
	fixed20_12 a;

	rs400_gart_adjust_size(rdev);
	/* DDR for all card after R300 & IGP */
	rdev->mc.vram_is_ddr = true;
	/* FIXME: is this correct for RS690/RS740 ? */
	tmp = RREG32(RADEON_MEM_CNTL);
	if (tmp & R300_MEM_NUM_CHANNELS_MASK) {
		rdev->mc.vram_width = 128;
	} else {
		rdev->mc.vram_width = 64;
	}
	rdev->mc.real_vram_size = RREG32(RADEON_CONFIG_MEMSIZE);
	rdev->mc.mc_vram_size = rdev->mc.real_vram_size;

	rdev->mc.aper_base = drm_get_resource_start(rdev->ddev, 0);
	rdev->mc.aper_size = drm_get_resource_len(rdev->ddev, 0);
	rs690_pm_info(rdev);
	/* FIXME: we should enforce default clock in case GPU is not in
	 * default setup
	 */
	a.full = rfixed_const(100);
	rdev->pm.sclk.full = rfixed_const(rdev->clock.default_sclk);
	rdev->pm.sclk.full = rfixed_div(rdev->pm.sclk, a);
	a.full = rfixed_const(16);
	/* core_bandwidth = sclk(Mhz) * 16 */
	rdev->pm.core_bandwidth.full = rfixed_div(rdev->pm.sclk, a);
}

void rs690_line_buffer_adjust(struct radeon_device *rdev,
			      struct drm_display_mode *mode1,
			      struct drm_display_mode *mode2)
{
	u32 tmp;

	/*
	 * Line Buffer Setup
	 * There is a single line buffer shared by both display controllers.
	 * DC_LB_MEMORY_SPLIT controls how that line buffer is shared between
	 * the display controllers.  The paritioning can either be done
	 * manually or via one of four preset allocations specified in bits 1:0:
	 *  0 - line buffer is divided in half and shared between crtc
	 *  1 - D1 gets 3/4 of the line buffer, D2 gets 1/4
	 *  2 - D1 gets the whole buffer
	 *  3 - D1 gets 1/4 of the line buffer, D2 gets 3/4
	 * Setting bit 2 of DC_LB_MEMORY_SPLIT controls switches to manual
	 * allocation mode. In manual allocation mode, D1 always starts at 0,
	 * D1 end/2 is specified in bits 14:4; D2 allocation follows D1.
	 */
	tmp = RREG32(DC_LB_MEMORY_SPLIT) & ~DC_LB_MEMORY_SPLIT_MASK;
	tmp &= ~DC_LB_MEMORY_SPLIT_SHIFT_MODE;
	/* auto */
	if (mode1 && mode2) {
		if (mode1->hdisplay > mode2->hdisplay) {
			if (mode1->hdisplay > 2560)
				tmp |= DC_LB_MEMORY_SPLIT_D1_3Q_D2_1Q;
			else
				tmp |= DC_LB_MEMORY_SPLIT_D1HALF_D2HALF;
		} else if (mode2->hdisplay > mode1->hdisplay) {
			if (mode2->hdisplay > 2560)
				tmp |= DC_LB_MEMORY_SPLIT_D1_1Q_D2_3Q;
			else
				tmp |= DC_LB_MEMORY_SPLIT_D1HALF_D2HALF;
		} else
			tmp |= AVIVO_DC_LB_MEMORY_SPLIT_D1HALF_D2HALF;
	} else if (mode1) {
		tmp |= DC_LB_MEMORY_SPLIT_D1_ONLY;
	} else if (mode2) {
		tmp |= DC_LB_MEMORY_SPLIT_D1_1Q_D2_3Q;
	}
	WREG32(DC_LB_MEMORY_SPLIT, tmp);
}

struct rs690_watermark {
	u32        lb_request_fifo_depth;
	fixed20_12 num_line_pair;
	fixed20_12 estimated_width;
	fixed20_12 worst_case_latency;
	fixed20_12 consumption_rate;
	fixed20_12 active_time;
	fixed20_12 dbpp;
	fixed20_12 priority_mark_max;
	fixed20_12 priority_mark;
	fixed20_12 sclk;
};

void rs690_crtc_bandwidth_compute(struct radeon_device *rdev,
				  struct radeon_crtc *crtc,
				  struct rs690_watermark *wm)
{
	struct drm_display_mode *mode = &crtc->base.mode;
	fixed20_12 a, b, c;
	fixed20_12 pclk, request_fifo_depth, tolerable_latency, estimated_width;
	fixed20_12 consumption_time, line_time, chunk_time, read_delay_latency;
	/* FIXME: detect IGP with sideport memory, i don't think there is any
	 * such product available
	 */
	bool sideport = false;

	if (!crtc->base.enabled) {
		/* FIXME: wouldn't it better to set priority mark to maximum */
		wm->lb_request_fifo_depth = 4;
		return;
	}

	if (crtc->vsc.full > rfixed_const(2))
		wm->num_line_pair.full = rfixed_const(2);
	else
		wm->num_line_pair.full = rfixed_const(1);

	b.full = rfixed_const(mode->crtc_hdisplay);
	c.full = rfixed_const(256);
	a.full = rfixed_mul(wm->num_line_pair, b);
	request_fifo_depth.full = rfixed_div(a, c);
	if (a.full < rfixed_const(4)) {
		wm->lb_request_fifo_depth = 4;
	} else {
		wm->lb_request_fifo_depth = rfixed_trunc(request_fifo_depth);
	}

	/* Determine consumption rate
	 *  pclk = pixel clock period(ns) = 1000 / (mode.clock / 1000)
	 *  vtaps = number of vertical taps,
	 *  vsc = vertical scaling ratio, defined as source/destination
	 *  hsc = horizontal scaling ration, defined as source/destination
	 */
	a.full = rfixed_const(mode->clock);
	b.full = rfixed_const(1000);
	a.full = rfixed_div(a, b);
	pclk.full = rfixed_div(b, a);
	if (crtc->rmx_type != RMX_OFF) {
		b.full = rfixed_const(2);
		if (crtc->vsc.full > b.full)
			b.full = crtc->vsc.full;
		b.full = rfixed_mul(b, crtc->hsc);
		c.full = rfixed_const(2);
		b.full = rfixed_div(b, c);
		consumption_time.full = rfixed_div(pclk, b);
	} else {
		consumption_time.full = pclk.full;
	}
	a.full = rfixed_const(1);
	wm->consumption_rate.full = rfixed_div(a, consumption_time);


	/* Determine line time
	 *  LineTime = total time for one line of displayhtotal
	 *  LineTime = total number of horizontal pixels
	 *  pclk = pixel clock period(ns)
	 */
	a.full = rfixed_const(crtc->base.mode.crtc_htotal);
	line_time.full = rfixed_mul(a, pclk);

	/* Determine active time
	 *  ActiveTime = time of active region of display within one line,
	 *  hactive = total number of horizontal active pixels
	 *  htotal = total number of horizontal pixels
	 */
	a.full = rfixed_const(crtc->base.mode.crtc_htotal);
	b.full = rfixed_const(crtc->base.mode.crtc_hdisplay);
	wm->active_time.full = rfixed_mul(line_time, b);
	wm->active_time.full = rfixed_div(wm->active_time, a);

	/* Maximun bandwidth is the minimun bandwidth of all component */
	rdev->pm.max_bandwidth = rdev->pm.core_bandwidth;
	if (sideport) {
		if (rdev->pm.max_bandwidth.full > rdev->pm.sideport_bandwidth.full &&
			rdev->pm.sideport_bandwidth.full)
			rdev->pm.max_bandwidth = rdev->pm.sideport_bandwidth;
		read_delay_latency.full = rfixed_const(370 * 800 * 1000);
		read_delay_latency.full = rfixed_div(read_delay_latency,
			rdev->pm.igp_sideport_mclk);
	} else {
		if (rdev->pm.max_bandwidth.full > rdev->pm.k8_bandwidth.full &&
			rdev->pm.k8_bandwidth.full)
			rdev->pm.max_bandwidth = rdev->pm.k8_bandwidth;
		if (rdev->pm.max_bandwidth.full > rdev->pm.ht_bandwidth.full &&
			rdev->pm.ht_bandwidth.full)
			rdev->pm.max_bandwidth = rdev->pm.ht_bandwidth;
		read_delay_latency.full = rfixed_const(5000);
	}

	/* sclk = system clocks(ns) = 1000 / max_bandwidth / 16 */
	a.full = rfixed_const(16);
	rdev->pm.sclk.full = rfixed_mul(rdev->pm.max_bandwidth, a);
	a.full = rfixed_const(1000);
	rdev->pm.sclk.full = rfixed_div(a, rdev->pm.sclk);
	/* Determine chunk time
	 * ChunkTime = the time it takes the DCP to send one chunk of data
	 * to the LB which consists of pipeline delay and inter chunk gap
	 * sclk = system clock(ns)
	 */
	a.full = rfixed_const(256 * 13);
	chunk_time.full = rfixed_mul(rdev->pm.sclk, a);
	a.full = rfixed_const(10);
	chunk_time.full = rfixed_div(chunk_time, a);

	/* Determine the worst case latency
	 * NumLinePair = Number of line pairs to request(1=2 lines, 2=4 lines)
	 * WorstCaseLatency = worst case time from urgent to when the MC starts
	 *                    to return data
	 * READ_DELAY_IDLE_MAX = constant of 1us
	 * ChunkTime = time it takes the DCP to send one chunk of data to the LB
	 *             which consists of pipeline delay and inter chunk gap
	 */
	if (rfixed_trunc(wm->num_line_pair) > 1) {
		a.full = rfixed_const(3);
		wm->worst_case_latency.full = rfixed_mul(a, chunk_time);
		wm->worst_case_latency.full += read_delay_latency.full;
	} else {
		a.full = rfixed_const(2);
		wm->worst_case_latency.full = rfixed_mul(a, chunk_time);
		wm->worst_case_latency.full += read_delay_latency.full;
	}

	/* Determine the tolerable latency
	 * TolerableLatency = Any given request has only 1 line time
	 *                    for the data to be returned
	 * LBRequestFifoDepth = Number of chunk requests the LB can
	 *                      put into the request FIFO for a display
	 *  LineTime = total time for one line of display
	 *  ChunkTime = the time it takes the DCP to send one chunk
	 *              of data to the LB which consists of
	 *  pipeline delay and inter chunk gap
	 */
	if ((2+wm->lb_request_fifo_depth) >= rfixed_trunc(request_fifo_depth)) {
		tolerable_latency.full = line_time.full;
	} else {
		tolerable_latency.full = rfixed_const(wm->lb_request_fifo_depth - 2);
		tolerable_latency.full = request_fifo_depth.full - tolerable_latency.full;
		tolerable_latency.full = rfixed_mul(tolerable_latency, chunk_time);
		tolerable_latency.full = line_time.full - tolerable_latency.full;
	}
	/* We assume worst case 32bits (4 bytes) */
	wm->dbpp.full = rfixed_const(4 * 8);

	/* Determine the maximum priority mark
	 *  width = viewport width in pixels
	 */
	a.full = rfixed_const(16);
	wm->priority_mark_max.full = rfixed_const(crtc->base.mode.crtc_hdisplay);
	wm->priority_mark_max.full = rfixed_div(wm->priority_mark_max, a);

	/* Determine estimated width */
	estimated_width.full = tolerable_latency.full - wm->worst_case_latency.full;
	estimated_width.full = rfixed_div(estimated_width, consumption_time);
	if (rfixed_trunc(estimated_width) > crtc->base.mode.crtc_hdisplay) {
		wm->priority_mark.full = rfixed_const(10);
	} else {
		a.full = rfixed_const(16);
		wm->priority_mark.full = rfixed_div(estimated_width, a);
		wm->priority_mark.full = wm->priority_mark_max.full - wm->priority_mark.full;
	}
}

void rs690_bandwidth_update(struct radeon_device *rdev)
{
	struct drm_display_mode *mode0 = NULL;
	struct drm_display_mode *mode1 = NULL;
	struct rs690_watermark wm0;
	struct rs690_watermark wm1;
	u32 tmp;
	fixed20_12 priority_mark02, priority_mark12, fill_rate;
	fixed20_12 a, b;

	if (rdev->mode_info.crtcs[0]->base.enabled)
		mode0 = &rdev->mode_info.crtcs[0]->base.mode;
	if (rdev->mode_info.crtcs[1]->base.enabled)
		mode1 = &rdev->mode_info.crtcs[1]->base.mode;
	/*
	 * Set display0/1 priority up in the memory controller for
	 * modes if the user specifies HIGH for displaypriority
	 * option.
	 */
	if (rdev->disp_priority == 2) {
		tmp = RREG32_MC(MC_INIT_MISC_LAT_TIMER);
		tmp &= ~MC_DISP1R_INIT_LAT_MASK;
		tmp &= ~MC_DISP0R_INIT_LAT_MASK;
		if (mode1)
			tmp |= (1 << MC_DISP1R_INIT_LAT_SHIFT);
		if (mode0)
			tmp |= (1 << MC_DISP0R_INIT_LAT_SHIFT);
		WREG32_MC(MC_INIT_MISC_LAT_TIMER, tmp);
	}
	rs690_line_buffer_adjust(rdev, mode0, mode1);

	if ((rdev->family == CHIP_RS690) || (rdev->family == CHIP_RS740))
		WREG32(DCP_CONTROL, 0);
	if ((rdev->family == CHIP_RS780) || (rdev->family == CHIP_RS880))
		WREG32(DCP_CONTROL, 2);

	rs690_crtc_bandwidth_compute(rdev, rdev->mode_info.crtcs[0], &wm0);
	rs690_crtc_bandwidth_compute(rdev, rdev->mode_info.crtcs[1], &wm1);

	tmp = (wm0.lb_request_fifo_depth - 1);
	tmp |= (wm1.lb_request_fifo_depth - 1) << 16;
	WREG32(LB_MAX_REQ_OUTSTANDING, tmp);

	if (mode0 && mode1) {
		if (rfixed_trunc(wm0.dbpp) > 64)
			a.full = rfixed_mul(wm0.dbpp, wm0.num_line_pair);
		else
			a.full = wm0.num_line_pair.full;
		if (rfixed_trunc(wm1.dbpp) > 64)
			b.full = rfixed_mul(wm1.dbpp, wm1.num_line_pair);
		else
			b.full = wm1.num_line_pair.full;
		a.full += b.full;
		fill_rate.full = rfixed_div(wm0.sclk, a);
		if (wm0.consumption_rate.full > fill_rate.full) {
			b.full = wm0.consumption_rate.full - fill_rate.full;
			b.full = rfixed_mul(b, wm0.active_time);
			a.full = rfixed_mul(wm0.worst_case_latency,
						wm0.consumption_rate);
			a.full = a.full + b.full;
			b.full = rfixed_const(16 * 1000);
			priority_mark02.full = rfixed_div(a, b);
		} else {
			a.full = rfixed_mul(wm0.worst_case_latency,
						wm0.consumption_rate);
			b.full = rfixed_const(16 * 1000);
			priority_mark02.full = rfixed_div(a, b);
		}
		if (wm1.consumption_rate.full > fill_rate.full) {
			b.full = wm1.consumption_rate.full - fill_rate.full;
			b.full = rfixed_mul(b, wm1.active_time);
			a.full = rfixed_mul(wm1.worst_case_latency,
						wm1.consumption_rate);
			a.full = a.full + b.full;
			b.full = rfixed_const(16 * 1000);
			priority_mark12.full = rfixed_div(a, b);
		} else {
			a.full = rfixed_mul(wm1.worst_case_latency,
						wm1.consumption_rate);
			b.full = rfixed_const(16 * 1000);
			priority_mark12.full = rfixed_div(a, b);
		}
		if (wm0.priority_mark.full > priority_mark02.full)
			priority_mark02.full = wm0.priority_mark.full;
		if (rfixed_trunc(priority_mark02) < 0)
			priority_mark02.full = 0;
		if (wm0.priority_mark_max.full > priority_mark02.full)
			priority_mark02.full = wm0.priority_mark_max.full;
		if (wm1.priority_mark.full > priority_mark12.full)
			priority_mark12.full = wm1.priority_mark.full;
		if (rfixed_trunc(priority_mark12) < 0)
			priority_mark12.full = 0;
		if (wm1.priority_mark_max.full > priority_mark12.full)
			priority_mark12.full = wm1.priority_mark_max.full;
		WREG32(D1MODE_PRIORITY_A_CNT, rfixed_trunc(priority_mark02));
		WREG32(D1MODE_PRIORITY_B_CNT, rfixed_trunc(priority_mark02));
		WREG32(D2MODE_PRIORITY_A_CNT, rfixed_trunc(priority_mark12));
		WREG32(D2MODE_PRIORITY_B_CNT, rfixed_trunc(priority_mark12));
	} else if (mode0) {
		if (rfixed_trunc(wm0.dbpp) > 64)
			a.full = rfixed_mul(wm0.dbpp, wm0.num_line_pair);
		else
			a.full = wm0.num_line_pair.full;
		fill_rate.full = rfixed_div(wm0.sclk, a);
		if (wm0.consumption_rate.full > fill_rate.full) {
			b.full = wm0.consumption_rate.full - fill_rate.full;
			b.full = rfixed_mul(b, wm0.active_time);
			a.full = rfixed_mul(wm0.worst_case_latency,
						wm0.consumption_rate);
			a.full = a.full + b.full;
			b.full = rfixed_const(16 * 1000);
			priority_mark02.full = rfixed_div(a, b);
		} else {
			a.full = rfixed_mul(wm0.worst_case_latency,
						wm0.consumption_rate);
			b.full = rfixed_const(16 * 1000);
			priority_mark02.full = rfixed_div(a, b);
		}
		if (wm0.priority_mark.full > priority_mark02.full)
			priority_mark02.full = wm0.priority_mark.full;
		if (rfixed_trunc(priority_mark02) < 0)
			priority_mark02.full = 0;
		if (wm0.priority_mark_max.full > priority_mark02.full)
			priority_mark02.full = wm0.priority_mark_max.full;
		WREG32(D1MODE_PRIORITY_A_CNT, rfixed_trunc(priority_mark02));
		WREG32(D1MODE_PRIORITY_B_CNT, rfixed_trunc(priority_mark02));
		WREG32(D2MODE_PRIORITY_A_CNT, MODE_PRIORITY_OFF);
		WREG32(D2MODE_PRIORITY_B_CNT, MODE_PRIORITY_OFF);
	} else {
		if (rfixed_trunc(wm1.dbpp) > 64)
			a.full = rfixed_mul(wm1.dbpp, wm1.num_line_pair);
		else
			a.full = wm1.num_line_pair.full;
		fill_rate.full = rfixed_div(wm1.sclk, a);
		if (wm1.consumption_rate.full > fill_rate.full) {
			b.full = wm1.consumption_rate.full - fill_rate.full;
			b.full = rfixed_mul(b, wm1.active_time);
			a.full = rfixed_mul(wm1.worst_case_latency,
						wm1.consumption_rate);
			a.full = a.full + b.full;
			b.full = rfixed_const(16 * 1000);
			priority_mark12.full = rfixed_div(a, b);
		} else {
			a.full = rfixed_mul(wm1.worst_case_latency,
						wm1.consumption_rate);
			b.full = rfixed_const(16 * 1000);
			priority_mark12.full = rfixed_div(a, b);
		}
		if (wm1.priority_mark.full > priority_mark12.full)
			priority_mark12.full = wm1.priority_mark.full;
		if (rfixed_trunc(priority_mark12) < 0)
			priority_mark12.full = 0;
		if (wm1.priority_mark_max.full > priority_mark12.full)
			priority_mark12.full = wm1.priority_mark_max.full;
		WREG32(D1MODE_PRIORITY_A_CNT, MODE_PRIORITY_OFF);
		WREG32(D1MODE_PRIORITY_B_CNT, MODE_PRIORITY_OFF);
		WREG32(D2MODE_PRIORITY_A_CNT, rfixed_trunc(priority_mark12));
		WREG32(D2MODE_PRIORITY_B_CNT, rfixed_trunc(priority_mark12));
	}
}

/*
 * Indirect registers accessor
 */
uint32_t rs690_mc_rreg(struct radeon_device *rdev, uint32_t reg)
{
	uint32_t r;

	WREG32(RS690_MC_INDEX, (reg & RS690_MC_INDEX_MASK));
	r = RREG32(RS690_MC_DATA);
	WREG32(RS690_MC_INDEX, RS690_MC_INDEX_MASK);
	return r;
}

void rs690_mc_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
{
	WREG32(RS690_MC_INDEX,
	       RS690_MC_INDEX_WR_EN | ((reg) & RS690_MC_INDEX_MASK));
	WREG32(RS690_MC_DATA, v);
	WREG32(RS690_MC_INDEX, RS690_MC_INDEX_WR_ACK);
}