OMAPDSS: DSS: add new clock calculation code

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>

2 files changed, 42 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 054c2a22b3f1..eba4127b61a6 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -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) {
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 0ff41dd8f3c5..4180302a7fb3 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -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;