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/*
* Copyright © 2006-2011 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
*/
#include <drm/drmP.h>
#include "gma_display.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"
#include "psb_drv.h"
/**
* Returns whether any output on the specified pipe is of the specified type
*/
bool gma_pipe_has_type(struct drm_crtc *crtc, int type)
{
struct drm_device *dev = crtc->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct drm_connector *l_entry;
list_for_each_entry(l_entry, &mode_config->connector_list, head) {
if (l_entry->encoder && l_entry->encoder->crtc == crtc) {
struct psb_intel_encoder *psb_intel_encoder =
psb_intel_attached_encoder(l_entry);
if (psb_intel_encoder->type == type)
return true;
}
}
return false;
}
#define GMA_PLL_INVALID(s) { /* DRM_ERROR(s); */ return false; }
bool gma_pll_is_valid(struct drm_crtc *crtc,
const struct gma_limit_t *limit,
struct gma_clock_t *clock)
{
if (clock->p1 < limit->p1.min || limit->p1.max < clock->p1)
GMA_PLL_INVALID("p1 out of range");
if (clock->p < limit->p.min || limit->p.max < clock->p)
GMA_PLL_INVALID("p out of range");
if (clock->m2 < limit->m2.min || limit->m2.max < clock->m2)
GMA_PLL_INVALID("m2 out of range");
if (clock->m1 < limit->m1.min || limit->m1.max < clock->m1)
GMA_PLL_INVALID("m1 out of range");
/* On CDV m1 is always 0 */
if (clock->m1 <= clock->m2 && clock->m1 != 0)
GMA_PLL_INVALID("m1 <= m2 && m1 != 0");
if (clock->m < limit->m.min || limit->m.max < clock->m)
GMA_PLL_INVALID("m out of range");
if (clock->n < limit->n.min || limit->n.max < clock->n)
GMA_PLL_INVALID("n out of range");
if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
GMA_PLL_INVALID("vco out of range");
/* XXX: We may need to be checking "Dot clock"
* depending on the multiplier, connector, etc.,
* rather than just a single range.
*/
if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
GMA_PLL_INVALID("dot out of range");
return true;
}
bool gma_find_best_pll(const struct gma_limit_t *limit,
struct drm_crtc *crtc, int target, int refclk,
struct gma_clock_t *best_clock)
{
struct drm_device *dev = crtc->dev;
const struct gma_clock_funcs *clock_funcs =
to_psb_intel_crtc(crtc)->clock_funcs;
struct gma_clock_t clock;
int err = target;
if (gma_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
(REG_READ(LVDS) & LVDS_PORT_EN) != 0) {
/*
* For LVDS, if the panel is on, just rely on its current
* settings for dual-channel. We haven't figured out how to
* reliably set up different single/dual channel state, if we
* even can.
*/
if ((REG_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
LVDS_CLKB_POWER_UP)
clock.p2 = limit->p2.p2_fast;
else
clock.p2 = limit->p2.p2_slow;
} else {
if (target < limit->p2.dot_limit)
clock.p2 = limit->p2.p2_slow;
else
clock.p2 = limit->p2.p2_fast;
}
memset(best_clock, 0, sizeof(*best_clock));
/* m1 is always 0 on CDV so the outmost loop will run just once */
for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
for (clock.m2 = limit->m2.min;
(clock.m2 < clock.m1 || clock.m1 == 0) &&
clock.m2 <= limit->m2.max; clock.m2++) {
for (clock.n = limit->n.min;
clock.n <= limit->n.max; clock.n++) {
for (clock.p1 = limit->p1.min;
clock.p1 <= limit->p1.max;
clock.p1++) {
int this_err;
clock_funcs->clock(refclk, &clock);
if (!clock_funcs->pll_is_valid(crtc,
limit, &clock))
continue;
this_err = abs(clock.dot - target);
if (this_err < err) {
*best_clock = clock;
err = this_err;
}
}
}
}
}
return err != target;
}
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