Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751414AbaBEIlL (ORCPT ); Wed, 5 Feb 2014 03:41:11 -0500 Received: from mail-wi0-f180.google.com ([209.85.212.180]:43450 "EHLO mail-wi0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750968AbaBEIlH (ORCPT ); Wed, 5 Feb 2014 03:41:07 -0500 From: Jean-Jacques Hiblot To: nicolas.ferre@atmel.com, mturquette@linaro.org Cc: b.brezillon@overkiz.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jason@lakedaemon.net Subject: [PATCH v2 1/4] clk: at91: replace prog clk round_rate with determine_rate Date: Wed, 5 Feb 2014 09:37:35 +0100 Message-Id: <1391589458-28018-2-git-send-email-jjhiblot@traphandler.com> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1391589458-28018-1-git-send-email-jjhiblot@traphandler.com> References: <1391589458-28018-1-git-send-email-jjhiblot@traphandler.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Boris BREZILLON Implement the determine_rate callback to choose the best parent clk that fulfills the requested rate. Signed-off-by: Boris BREZILLON --- drivers/clk/at91/clk-programmable.c | 56 ++++++++++++++++++------------------- 1 file changed, 28 insertions(+), 28 deletions(-) diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c index fd792b2..eff7016 100644 --- a/drivers/clk/at91/clk-programmable.c +++ b/drivers/clk/at91/clk-programmable.c @@ -102,40 +102,40 @@ static unsigned long clk_programmable_recalc_rate(struct clk_hw *hw, return parent_rate >> prog->pres; } -static long clk_programmable_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *parent_rate) +static long clk_programmable_determine_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long *best_parent_rate, + struct clk **best_parent_clk) { - unsigned long best_rate = *parent_rate; - unsigned long best_diff; - unsigned long new_diff; - unsigned long cur_rate; - int shift = shift; - - if (rate > *parent_rate) - return *parent_rate; - else - best_diff = *parent_rate - rate; - - if (!best_diff) - return best_rate; + struct clk *parent = NULL; + long best_rate = -EINVAL; + unsigned long parent_rate; + unsigned long tmp_rate; + int shift; + int i; - for (shift = 1; shift < PROG_PRES_MASK; shift++) { - cur_rate = *parent_rate >> shift; + for (i = 0; i < __clk_get_num_parents(hw->clk); i++) { + parent = clk_get_parent_by_index(hw->clk, i); + if (!parent) + continue; - if (cur_rate > rate) - new_diff = cur_rate - rate; - else - new_diff = rate - cur_rate; + parent_rate = __clk_get_rate(parent); + for (shift = 0; shift < PROG_PRES_MASK; shift++) { + tmp_rate = parent_rate >> shift; + if (tmp_rate <= rate) + break; + } - if (!new_diff) - return cur_rate; + if (tmp_rate > rate) + continue; - if (new_diff < best_diff) { - best_diff = new_diff; - best_rate = cur_rate; + if (best_rate < 0 || (rate - tmp_rate) < (rate - best_rate)) { + best_rate = tmp_rate; + *best_parent_rate = parent_rate; + *best_parent_clk = parent; } - if (rate > cur_rate) + if (!best_rate) break; } @@ -228,7 +228,7 @@ static const struct clk_ops programmable_ops = { .prepare = clk_programmable_prepare, .is_prepared = clk_programmable_is_ready, .recalc_rate = clk_programmable_recalc_rate, - .round_rate = clk_programmable_round_rate, + .determine_rate = clk_programmable_determine_rate, .get_parent = clk_programmable_get_parent, .set_parent = clk_programmable_set_parent, .set_rate = clk_programmable_set_rate, -- 1.8.5.2 -- 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/