linux-kernel - [PATCH v3 17/20] clk: tegra: pll: Fix _pll_ramp_calc_pll logic and _calc_dynamic_ramp

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Message-ID: <1430506447-29074-18-git-send-email-rklein@nvidia.com>
Date:	Fri, 1 May 2015 14:54:04 -0400
From:	Rhyland Klein <rklein@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rhyland Klein <rklein@...dia.com>
Subject: [PATCH v3 17/20] clk: tegra: pll: Fix _pll_ramp_calc_pll logic and _calc_dynamic_ramp_rate

This removes the conversion from pdiv to hw, which is already taken
care of by _get_table_rate before this code is run. This avoids
incorrectly converting pdiv to hw twice and getting the wrong hw value.

Also set the input_rate in the freq cfg in _calc_dynamic_ramp_rate while
setting all the other fields.

Signed-off-by: Rhyland Klein <rklein@...dia.com>
---
v2:
  - Added fix for _calc_dynamic_ramp_rate where input_rate wasn't ever
    populated in the cfg, which could cause problems later if/when
    accessed.

 drivers/clk/tegra/clk-pll.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 28a2376cd8a7..44bdbbac361d 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -1018,6 +1018,7 @@ static int _calc_dynamic_ramp_rate(struct clk_hw *hw,
 	cfg->m = _pll_fixed_mdiv(pll->params, parent_rate);
 	cfg->output_rate = rate * p;
 	cfg->n = cfg->output_rate * cfg->m / parent_rate;
+	cfg->input_rate = parent_rate;
 
 	p_div = _p_div_to_hw(hw, p);
 	if (p_div < 0)
@@ -1036,7 +1037,7 @@ static int _pll_ramp_calc_pll(struct clk_hw *hw,
 			      unsigned long rate, unsigned long parent_rate)
 {
 	struct tegra_clk_pll *pll = to_clk_pll(hw);
-	int err = 0, p_div;
+	int err = 0;
 
 	err = _get_table_rate(hw, cfg, rate, parent_rate);
 	if (err < 0)
@@ -1047,11 +1048,6 @@ static int _pll_ramp_calc_pll(struct clk_hw *hw,
 			err = -EINVAL;
 			goto out;
 		}
-		p_div = _p_div_to_hw(hw, cfg->p);
-		if (p_div < 0)
-			return p_div;
-		else
-			cfg->p = p_div;
 	}
 
 	if (cfg->p >  pll->params->max_p)
-- 
1.7.9.5

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