On Friday 08 March 2013 05:22 PM, Tomi Valkeinen wrote:
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 <[email protected]>
---
drivers/video/omap2/dss/dss.c | 36 ++++++++++++++++++++++++++++++++++++
drivers/video/omap2/dss/dss.h | 3 +++
2 files changed, 39 insertions(+)
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 054c2a2..21a3dc8 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -473,6 +473,42 @@ 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) {
+ /* XXX can we change the clock on omap2? */
We can change dss_fclk1 on omap2, and the cclock2420_data.c and
cclock2430_data.c have clksel structs which allow a set of dividers. The
dividers are not continuous though, 1 to 12 and 16 are allowed. So we
might need to change the code here a bit, if we want to change the clock
in the first place.
Archit
+ 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 0ff41dd..4180302 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;
--
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