linux-kernel - [PATCH v2 6/7] clk: tegra: correct tegra210_pll_fixed_mdiv

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Date:   Thu, 23 Feb 2017 12:44:43 +0200
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...eaurora.org>,
        Stephen Warren <swarren@...dotorg.org>,
        "Thierry Reding" <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Rhyland Klein" <rklein@...dia.com>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH v2 6/7] clk: tegra: correct tegra210_pll_fixed_mdiv_cfg rate calculation

Return the actually achieved rate in cfg->output_rate rather than just the
requested rate. This is important to make clk_round_rate return the correct
result.

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 drivers/clk/tegra/clk-tegra210.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index fe698d2..58d7f9c 100644
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -1222,6 +1222,7 @@ static int tegra210_pll_fixed_mdiv_cfg(struct clk_hw *hw,
 	cfg->n = p_rate / cf;
 
 	cfg->sdm_data = 0;
+	cfg->output_rate = input_rate;
 	if (params->sdm_ctrl_reg) {
 		unsigned long rem = p_rate - cf * cfg->n;
 		/* If ssc is enabled SDM enabled as well, even for integer n */
@@ -1232,10 +1233,15 @@ static int tegra210_pll_fixed_mdiv_cfg(struct clk_hw *hw,
 			s -= PLL_SDM_COEFF / 2;
 			cfg->sdm_data = sdin_din_to_data(s);
 		}
+		cfg->output_rate *= cfg->n * PLL_SDM_COEFF + PLL_SDM_COEFF/2 +
+					sdin_data_to_din(cfg->sdm_data);
+		cfg->output_rate /= p * cfg->m * PLL_SDM_COEFF;
+	} else {
+		cfg->output_rate *= cfg->n;
+		cfg->output_rate /= p * cfg->m;
 	}
 
 	cfg->input_rate = input_rate;
-	cfg->output_rate = rate;
 
 	return 0;
 }
-- 
1.9.1