diff mbox series

[04/38] ccs-pll: End search if there are no better values available

Message ID 20201202180641.17401-5-sakari.ailus@linux.intel.com
State Accepted
Commit 9c1a0d9e9188e7dc2f8f723ce87885e17636ede8
Headers show
Series Support additional CCS PLL features, C-PHY | expand

Commit Message

Sakari Ailus Dec. 2, 2020, 6:06 p.m. UTC 
The VT divisor search can be ended if we've already found the value that
corresponds exactly the total divisor, as there are no better (lower)
values available.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/i2c/ccs-pll.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/i2c/ccs-pll.c b/drivers/media/i2c/ccs-pll.c
index ea0f84fc8a90..22e29127804a 100644
--- a/drivers/media/i2c/ccs-pll.c
+++ b/drivers/media/i2c/ccs-pll.c
@@ -352,6 +352,7 @@  __ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim,
 		     sys_div <= max_sys_div;
 		     sys_div += 2 - (sys_div & 1)) {
 			uint16_t pix_div = DIV_ROUND_UP(vt_div, sys_div);
+			uint16_t rounded_div;
 
 			if (pix_div < lim->vt_bk.min_pix_clk_div
 			    || pix_div > lim->vt_bk.max_pix_clk_div) {
@@ -363,10 +364,15 @@  __ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim,
 				continue;
 			}
 
+			rounded_div = roundup(vt_div, best_pix_div);
+
 			/* Check if this one is better. */
-			if (pix_div * sys_div
-			    <= roundup(vt_div, best_pix_div))
+			if (pix_div * sys_div <= rounded_div)
 				best_pix_div = pix_div;
+
+			/* Bail out if we've already found the best value. */
+			if (vt_div == rounded_div)
+				break;
 		}
 		if (best_pix_div < INT_MAX >> 1)
 			break;