linux-kernel - [RFC 08/13] smiapp-pll: Take existing divisor into account in minimum divisor check

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Date:   Tue, 14 Feb 2017 14:40:04 +0100
From:   Pavel Machek <pavel@....cz>
To:     sakari.ailus@....fi
Cc:     sre@...nel.org, pali.rohar@...il.com, pavel@....cz,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        laurent.pinchart@...asonboard.com, mchehab@...nel.org,
        ivo.g.dimitrov.75@...il.com
Subject: [RFC 08/13] smiapp-pll: Take existing divisor into account in
 minimum divisor check

From: Sakari Ailus <sakari.ailus@....fi>

Required added multiplier (and divisor) calculation did not take into
account the existing divisor when checking the values against the
minimum divisor. Do just that.

Signed-off-by: Sakari Ailus <sakari.ailus@....fi>
Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Signed-off-by: Pavel Machek <pavel@....cz>
---
 drivers/media/i2c/smiapp-pll.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/smiapp-pll.c b/drivers/media/i2c/smiapp-pll.c
index 771db56..166bbaf 100644
--- a/drivers/media/i2c/smiapp-pll.c
+++ b/drivers/media/i2c/smiapp-pll.c
@@ -16,6 +16,8 @@
  * General Public License for more details.
  */
 
+#define DEBUG
+
 #include <linux/device.h>
 #include <linux/gcd.h>
 #include <linux/lcm.h>
@@ -227,7 +229,8 @@ static int __smiapp_pll_calculate(
 
 	more_mul_factor = lcm(div, pll->pre_pll_clk_div) / div;
 	dev_dbg(dev, "more_mul_factor: %u\n", more_mul_factor);
-	more_mul_factor = lcm(more_mul_factor, op_limits->min_sys_clk_div);
+	more_mul_factor = lcm(more_mul_factor,
+			      DIV_ROUND_UP(op_limits->min_sys_clk_div, div));
 	dev_dbg(dev, "more_mul_factor: min_op_sys_clk_div: %d\n",
 		more_mul_factor);
 	i = roundup(more_mul_min, more_mul_factor);
@@ -456,6 +459,10 @@ int smiapp_pll_calculate(struct device *dev,
 	i = gcd(pll->pll_op_clk_freq_hz, pll->ext_clk_freq_hz);
 	mul = div_u64(pll->pll_op_clk_freq_hz, i);
 	div = pll->ext_clk_freq_hz / i;
+	if (!mul) {
+		dev_err(dev, "forcing mul to 1\n");
+		mul = 1;
+	}
 	dev_dbg(dev, "mul %u / div %u\n", mul, div);
 
 	min_pre_pll_clk_div =
-- 
2.1.4


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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