linux-kernel - [PATCH 3.16 057/132] clk: tegra: Fix PLLM programming on Tegra124+ when PMC overrides divider

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Message-ID: <lsq.1568989415.619009294@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Steev Klimaszewski" <steev@...i.org>,
        "Stephen Boyd" <sboyd@...nel.org>,
        "Dmitry Osipenko" <digetx@...il.com>,
        "Peter De Schrijver" <pdeschrijver@...dia.com>
Subject: [PATCH 3.16 057/132] clk: tegra: Fix PLLM programming on
 Tegra124+ when PMC overrides divider

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dmitry Osipenko <digetx@...il.com>

commit 40db569d6769ffa3864fd1b89616b1a7323568a8 upstream.

There are wrongly set parenthesis in the code that are resulting in a
wrong configuration being programmed for PLLM. The original fix was made
by Danny Huang in the downstream kernel. The patch was tested on Nyan Big
Tegra124 chromebook, PLLM rate changing works correctly now and system
doesn't lock up after changing the PLLM rate due to EMC scaling.

Tested-by: Steev Klimaszewski <steev@...i.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Acked-By: Peter De Schrijver <pdeschrijver@...dia.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/clk/tegra/clk-pll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -486,8 +486,8 @@ static void _update_pll_mnp(struct tegra
 		pll_override_writel(val, params->pmc_divp_reg, pll);
 
 		val = pll_override_readl(params->pmc_divnm_reg, pll);
-		val &= ~(divm_mask(pll) << div_nmp->override_divm_shift) |
-			~(divn_mask(pll) << div_nmp->override_divn_shift);
+		val &= ~((divm_mask(pll) << div_nmp->override_divm_shift) |
+			(divn_mask(pll) << div_nmp->override_divn_shift));
 		val |= (cfg->m << div_nmp->override_divm_shift) |
 			(cfg->n << div_nmp->override_divn_shift);
 		pll_override_writel(val, params->pmc_divnm_reg, pll);