linux-kernel - [PATCH 3.19.y-ckt 044/107] clk: qcom: Use parent rate when set rate to pixel RCG clock

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Message-Id: <1438811379-384-45-git-send-email-kamal@canonical.com>
Date:	Wed,  5 Aug 2015 14:48:36 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Hai Li <hali@...eaurora.org>, Stephen Boyd <sboyd@...eaurora.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 044/107] clk: qcom: Use parent rate when set rate to pixel RCG clock

3.19.8-ckt5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hai Li <hali@...eaurora.org>

commit 6d451367bfa16fc103604bacd258f534c65d1540 upstream.

Since the parent rate has been recalculated, pixel RCG clock
should rely on it to find the correct M/N values during set_rate,
instead of calling __clk_round_rate() to its parent again.

Signed-off-by: Hai Li <hali@...eaurora.org>
Tested-by: Archit Taneja <architt@...eaurora.org>
Fixes: 99cbd064b059 ("clk: qcom: Support display RCG clocks")
[sboyd@...eaurora.org: Silenced unused parent variable warning]
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/clk/qcom/clk-rcg2.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 4fe9c01..05b7bbc 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -508,18 +508,16 @@ static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
 	struct freq_tbl f = *rcg->freq_tbl;
 	const struct frac_entry *frac = frac_table_pixel;
-	unsigned long request, src_rate;
+	unsigned long request;
 	int delta = 100000;
 	u32 mask = BIT(rcg->hid_width) - 1;
 	u32 hid_div;
-	struct clk *parent = clk_get_parent_by_index(hw->clk, f.src);
 
 	for (; frac->num; frac++) {
 		request = (rate * frac->den) / frac->num;
 
-		src_rate = __clk_round_rate(parent, request);
-		if ((src_rate < (request - delta)) ||
-			(src_rate > (request + delta)))
+		if ((parent_rate < (request - delta)) ||
+			(parent_rate > (request + delta)))
 			continue;
 
 		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
-- 
1.9.1

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