Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752370AbbEASzv (ORCPT ); Fri, 1 May 2015 14:55:51 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:18482 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752250AbbEASzo (ORCPT ); Fri, 1 May 2015 14:55:44 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Fri, 01 May 2015 11:54:05 -0700 From: Rhyland Klein To: Peter De Schrijver CC: Mike Turquette , Stephen Warren , Stephen Boyd , Thierry Reding , Alexandre Courbot , linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, Rhyland Klein , Andrew Bresticker Subject: [PATCH v3 20/20] clk: tegra: pll: Fix issues with rates for VCO PLLs Date: Fri, 1 May 2015 14:54:07 -0400 Message-ID: <1430506447-29074-21-git-send-email-rklein@nvidia.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1430506447-29074-1-git-send-email-rklein@nvidia.com> References: <1430506447-29074-1-git-send-email-rklein@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2136 Lines: 66 From: Andrew Bresticker Without this change clk_get_rate would return the final output rather than the VCO output as it would factor in the pdiv when it shouldn't. This will cause problems for all dividers in the subtree of the VCO PLL. Signed-off-by: Andrew Bresticker Signed-off-by: Rhyland Klein --- v3: - Added fix for this bug which was found during testing drivers/clk/tegra/clk-pll.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c index 44bdbbac361d..8953573b5bcd 100644 --- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -723,6 +723,8 @@ static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate, spin_lock_irqsave(pll->lock, flags); _get_pll_mnp(pll, &old_cfg); + if (pll->params->vco_out) + cfg.p = old_cfg.p; if (old_cfg.m != cfg.m || old_cfg.n != cfg.n || old_cfg.p != cfg.p || old_cfg.sdm_data != cfg.sdm_data) @@ -782,11 +784,15 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw, _get_pll_mnp(pll, &cfg); - pdiv = _hw_to_p_div(hw, cfg.p); - if (pdiv < 0) { - WARN(1, "Clock %s has invalid pdiv value : 0x%x\n", - __clk_get_name(hw->clk), cfg.p); + if (pll->params->vco_out) { pdiv = 1; + } else { + pdiv = _hw_to_p_div(hw, cfg.p); + if (pdiv < 0) { + WARN(1, "Clock %s has invalid pdiv value : 0x%x\n", + __clk_get_name(hw->clk), cfg.p); + pdiv = 1; + } } if (pll->params->set_gain) @@ -1073,6 +1079,8 @@ static int clk_pllxc_set_rate(struct clk_hw *hw, unsigned long rate, spin_lock_irqsave(pll->lock, flags); _get_pll_mnp(pll, &old_cfg); + if (pll->params->vco_out) + cfg.p = old_cfg.p; if (old_cfg.m != cfg.m || old_cfg.n != cfg.n || old_cfg.p != cfg.p) ret = _program_pll(hw, &cfg, rate); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/