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OMAPDSS: DISPC: add new clock calculation code

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Add new way to iterate over DISPC clock divisors. dispc_div_calc()
provides a generic way to go over all the divisors, within given pixel
clock range. dispc_div_calc() will call a callback function for each
divider set, making the function reusable for all use cases.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2013-03-05 16:32:08 +02:00
parent 4ce9e33c0f
commit 7c284e6ee3
2 changed files with 66 additions and 0 deletions
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60
drivers/video/omap2/dss/dispc.c
View File

@ -3374,6 +3374,66 @@ int dispc_calc_clock_rates(unsigned long dispc_fclk_rate,
return 0;
}
bool dispc_div_calc(unsigned long dispc,
unsigned long pck_min, unsigned long pck_max,
dispc_div_calc_func func, void *data)
{
int lckd, lckd_start, lckd_stop;
int pckd, pckd_start, pckd_stop;
unsigned long pck, lck;
unsigned long lck_max;
unsigned long pckd_hw_min, pckd_hw_max;
unsigned min_fck_per_pck;
unsigned long fck;
#ifdef CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK
min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK;
#else
min_fck_per_pck = 0;
#endif
pckd_hw_min = dss_feat_get_param_min(FEAT_PARAM_DSS_PCD);
pckd_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_PCD);
lck_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
pck_min = pck_min ? pck_min : 1;
pck_max = pck_max ? pck_max : ULONG_MAX;
lckd_start = max(DIV_ROUND_UP(dispc, lck_max), 1ul);
lckd_stop = min(dispc / pck_min, 255ul);
for (lckd = lckd_start; lckd <= lckd_stop; ++lckd) {
lck = dispc / lckd;
pckd_start = max(DIV_ROUND_UP(lck, pck_max), pckd_hw_min);
pckd_stop = min(lck / pck_min, pckd_hw_max);
for (pckd = pckd_start; pckd <= pckd_stop; ++pckd) {
pck = lck / pckd;
/*
* For OMAP2/3 the DISPC fclk is the same as LCD's logic
* clock, which means we're configuring DISPC fclk here
* also. Thus we need to use the calculated lck. For
* OMAP4+ the DISPC fclk is a separate clock.
*/
if (dss_has_feature(FEAT_CORE_CLK_DIV))
fck = dispc_core_clk_rate();
else
fck = lck;
if (fck < pck * min_fck_per_pck)
continue;
if (func(lckd, pckd, lck, pck, data))
return true;
}
}
return false;
}
void dispc_mgr_set_clock_div(enum omap_channel channel,
const struct dispc_clock_info *cinfo)
{

6
drivers/video/omap2/dss/dss.h
View File

@ -376,6 +376,12 @@ void dispc_enable_fifomerge(bool enable);
void dispc_enable_gamma_table(bool enable);
void dispc_set_loadmode(enum omap_dss_load_mode mode);
typedef bool (*dispc_div_calc_func)(int lckd, int pckd, unsigned long lck,
unsigned long pck, void *data);
bool dispc_div_calc(unsigned long dispc,
unsigned long pck_min, unsigned long pck_max,
dispc_div_calc_func func, void *data);
bool dispc_mgr_timings_ok(enum omap_channel channel,
const struct omap_video_timings *timings);
unsigned long dispc_fclk_rate(void);