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media: ccs-pll: End search if there are no better values available

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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>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sakari Ailus 2020-09-01 13:11:11 +02:00 committed by Mauro Carvalho Chehab
parent 9454432af0
commit 9c1a0d9e91
1 changed files with 8 additions and 2 deletions
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10
drivers/media/i2c/ccs-pll.c
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@ -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;