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OMAPDSS: DSS: add new clock calculation code

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Add new way to iterate over DSS clock divisors. dss_div_calc() provides
a generic way to go over all the divisors, within given clock range.
dss_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 16:34:05 +02:00
parent 7c284e6ee3
commit 43417823fd
2 changed files with 42 additions and 0 deletions
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39
drivers/video/omap2/dss/dss.c
View File

@ -473,6 +473,45 @@ int dss_calc_clock_rates(struct dss_clock_info *cinfo)
return 0;
}
bool dss_div_calc(unsigned long fck_min, dss_div_calc_func func, void *data)
{
int fckd, fckd_start, fckd_stop;
unsigned long fck;
unsigned long fck_hw_max;
unsigned long fckd_hw_max;
unsigned long prate;
if (dss.dpll4_m4_ck == NULL) {
/*
* TODO: dss1_fclk can be changed on OMAP2, but the available
* dividers are not continuous. We just use the pre-set rate for
* now.
*/
fck = clk_get_rate(dss.dss_clk);
fckd = 1;
return func(fckd, fck, data);
}
fck_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
fckd_hw_max = dss.feat->fck_div_max;
prate = dss_get_dpll4_rate() * dss.feat->dss_fck_multiplier;
fck_min = fck_min ? fck_min : 1;
fckd_start = min(prate / fck_min, fckd_hw_max);
fckd_stop = max(DIV_ROUND_UP(prate, fck_hw_max), 1ul);
for (fckd = fckd_start; fckd >= fckd_stop; --fckd) {
fck = prate / fckd;
if (func(fckd, fck, data))
return true;
}
return false;
}
int dss_set_clock_div(struct dss_clock_info *cinfo)
{
if (dss.dpll4_m4_ck) {

3
drivers/video/omap2/dss/dss.h
View File

@ -271,6 +271,9 @@ int dss_set_clock_div(struct dss_clock_info *cinfo);
int dss_calc_clock_div(unsigned long req_pck, struct dss_clock_info *dss_cinfo,
struct dispc_clock_info *dispc_cinfo);
typedef bool (*dss_div_calc_func)(int fckd, unsigned long fck, void *data);
bool dss_div_calc(unsigned long fck_min, dss_div_calc_func func, void *data);
/* SDI */
int sdi_init_platform_driver(void) __init;
void sdi_uninit_platform_driver(void) __exit;