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[8/8] OMAPDSS: fix rounding when calculating fclk rate

Message ID 1392285846-13199-9-git-send-email-tomi.valkeinen@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Tomi Valkeinen Feb. 13, 2014, 10:04 a.m. UTC 
"clk: divider: fix rate calculation for fractional rates" patch (and
similar for TI specific divider) fixes the clk-divider's rounding. This
patch updates the DSS driver to round the rates accordingly.

This fixes the DSS's warnings about clock rate mismatch, and also fixes
the wrong fclk rate being set.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/video/omap2/dss/dss.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 9a145da35ad3..efe7c308341d 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -471,7 +471,7 @@  bool dss_div_calc(unsigned long pck, unsigned long fck_min,
 	fckd_stop = max(DIV_ROUND_UP(prate * m, fck_hw_max), 1ul);
 
 	for (fckd = fckd_start; fckd >= fckd_stop; --fckd) {
-		fck = prate / fckd * m;
+		fck = DIV_ROUND_UP(prate, fckd) * m;
 
 		if (func(fck, data))
 			return true;
@@ -520,7 +520,7 @@  static int dss_setup_default_clock(void)
 
 		fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
 				max_dss_fck);
-		fck = prate / fck_div * dss.feat->dss_fck_multiplier;
+		fck = DIV_ROUND_UP(prate, fck_div) * dss.feat->dss_fck_multiplier;
 	}
 
 	r = dss_set_fck_rate(fck);