void nvhost_scale_emc_calibrate_emc(struct nvhost_emc_params *emc_params,
struct clk *clk_3d, struct clk *clk_3d_emc,
bool linear_emc)
{
long correction;
unsigned long max_emc;
unsigned long min_emc;
unsigned long min_rate_3d;
unsigned long max_rate_3d;
max_emc = clk_round_rate(clk_3d_emc, UINT_MAX);
max_emc = INT_TO_FX(HZ_TO_MHZ(max_emc));
min_emc = clk_round_rate(clk_3d_emc, 0);
min_emc = INT_TO_FX(HZ_TO_MHZ(min_emc));
max_rate_3d = clk_round_rate(clk_3d, UINT_MAX);
max_rate_3d = INT_TO_FX(HZ_TO_MHZ(max_rate_3d));
min_rate_3d = clk_round_rate(clk_3d, 0);
min_rate_3d = INT_TO_FX(HZ_TO_MHZ(min_rate_3d));
emc_params->emc_slope =
FXDIV((max_emc - min_emc), (max_rate_3d - min_rate_3d));
emc_params->emc_offset = max_emc -
FXMUL(emc_params->emc_slope, max_rate_3d);
/* Guarantee max 3d rate maps to max emc rate */
emc_params->emc_offset += max_emc -
(FXMUL(emc_params->emc_slope, max_rate_3d) +
emc_params->emc_offset);
emc_params->linear = linear_emc;
if (linear_emc)
return;
emc_params->emc_dip_offset = (max_emc - min_emc) / 4;
emc_params->emc_dip_slope =
-FXDIV(emc_params->emc_slope, max_rate_3d - min_rate_3d);
emc_params->emc_xmid = (max_rate_3d + min_rate_3d) / 2;
correction =
emc_params->emc_dip_offset +
FXMUL(emc_params->emc_dip_slope,
FXMUL(max_rate_3d - emc_params->emc_xmid,
max_rate_3d - emc_params->emc_xmid));
emc_params->emc_dip_offset -= correction;
}
static void nvhost_scale3d_calibrate_emc(void)
{
long correction;
unsigned long max_emc;
unsigned long min_emc;
unsigned long min_rate_3d;
unsigned long max_rate_3d;
max_emc = clk_round_rate(power_profile.clk_3d_emc, UINT_MAX);
max_emc = INT_TO_FX(HZ_TO_MHZ(max_emc));
min_emc = clk_round_rate(power_profile.clk_3d_emc, 0);
min_emc = INT_TO_FX(HZ_TO_MHZ(min_emc));
max_rate_3d = INT_TO_FX(HZ_TO_MHZ(power_profile.max_rate_3d));
min_rate_3d = INT_TO_FX(HZ_TO_MHZ(power_profile.min_rate_3d));
power_profile.emc_slope =
FXDIV((max_emc - min_emc), (max_rate_3d - min_rate_3d));
power_profile.emc_offset = max_emc -
FXMUL(power_profile.emc_slope, max_rate_3d);
/* Guarantee max 3d rate maps to max emc rate */
power_profile.emc_offset += max_emc -
(FXMUL(power_profile.emc_slope, max_rate_3d) +
power_profile.emc_offset);
power_profile.emc_dip_offset = (max_emc - min_emc) / 4;
power_profile.emc_dip_slope =
-4 * FXDIV(power_profile.emc_dip_offset,
(FXMUL(max_rate_3d - min_rate_3d,
max_rate_3d - min_rate_3d)));
power_profile.emc_xmid = (max_rate_3d + min_rate_3d) / 2;
correction =
power_profile.emc_dip_offset +
FXMUL(power_profile.emc_dip_slope,
FXMUL(max_rate_3d - power_profile.emc_xmid,
max_rate_3d - power_profile.emc_xmid));
power_profile.emc_dip_offset -= correction;
}
static int nvhost_scale3d_target(struct device *d, unsigned long *freq,
u32 flags)
{
long hz;
long after;
/* Inform that the clock is disabled */
if (!tegra_is_clk_enabled(power_profile.clk_3d)) {
*freq = 0;
return 0;
}
/* Limit the frequency */
if (*freq < power_profile.min_rate_3d)
*freq = power_profile.min_rate_3d;
else if (*freq > power_profile.max_rate_3d)
*freq = power_profile.max_rate_3d;
/* Check if we're already running at the desired speed */
if (*freq == clk_get_rate(power_profile.clk_3d))
return 0;
/* Set GPU clockrate */
if (tegra_get_chipid() == TEGRA_CHIPID_TEGRA3)
nvhost_module_set_devfreq_rate(power_profile.dev,
clk_to_idx(power_profile.clk_3d2), 0);
nvhost_module_set_devfreq_rate(power_profile.dev,
clk_to_idx(power_profile.clk_3d), *freq);
/* Set EMC clockrate */
after = (long) clk_get_rate(power_profile.clk_3d);
after = INT_TO_FX(HZ_TO_MHZ(after));
hz = FXMUL(after, power_profile.emc_slope) +
power_profile.emc_offset;
hz -= FXMUL(power_profile.emc_dip_slope,
FXMUL(after - power_profile.emc_xmid,
after - power_profile.emc_xmid)) +
power_profile.emc_dip_offset;
hz = MHZ_TO_HZ(FX_TO_INT(hz + FX_HALF)); /* round to nearest */
hz = (hz < 0) ? 0 : hz;
nvhost_module_set_devfreq_rate(power_profile.dev,
clk_to_idx(power_profile.clk_3d_emc), hz);
/* Get the new clockrate */
*freq = clk_get_rate(power_profile.clk_3d);
return 0;
}
long nvhost_scale_emc_get_emc_rate(struct nvhost_emc_params *emc_params,
long freq)
{
long hz;
freq = INT_TO_FX(HZ_TO_MHZ(freq));
hz = FXMUL(freq, emc_params->emc_slope) + emc_params->emc_offset;
if (!emc_params->linear)
hz -= FXMUL(emc_params->emc_dip_slope,
FXMUL(freq - emc_params->emc_xmid,
freq - emc_params->emc_xmid)) +
emc_params->emc_dip_offset;
hz = MHZ_TO_HZ(FX_TO_INT(hz + FX_HALF)); /* round to nearest */
hz = (hz < 0) ? 0 : hz;
return hz;
}
