On Wednesday 20 March 2013 08:58 PM, Tomi Valkeinen wrote:
On 2013-03-20 17:17, Archit Taneja wrote:
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 <tomi.valkeinen@xxxxxx>
---
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.
Ok, good to know. Note that the comment is copied from the old code. I
think I tried changing the clock on N800 with clk_set_rate long ago, but
I didn't get it to work. Things might have changed, but, well, I don't
think we should spend time on omap2 code. I'm sure we'll get a patch if
somebody needs it =).
We could change the comment to a TODO for now.
Archit
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