From patchwork Fri Mar 8 11:52:43 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 2237531 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 603904006E for ; Fri, 8 Mar 2013 11:53:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933909Ab3CHLxZ (ORCPT ); Fri, 8 Mar 2013 06:53:25 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:56493 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933870Ab3CHLxY (ORCPT ); Fri, 8 Mar 2013 06:53:24 -0500 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id r28BrNsu005185; Fri, 8 Mar 2013 05:53:23 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id r28BrNZL021614; Fri, 8 Mar 2013 05:53:23 -0600 Received: from dlelxv22.itg.ti.com (172.17.1.197) by dfle72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.1.323.3; Fri, 8 Mar 2013 05:53:23 -0600 Received: from deskari.tieu.ti.com (h64-3.vpn.ti.com [172.24.64.3]) by dlelxv22.itg.ti.com (8.13.8/8.13.8) with ESMTP id r28BrB43006389; Fri, 8 Mar 2013 05:53:22 -0600 From: Tomi Valkeinen To: Archit Taneja , , CC: Tomi Valkeinen Subject: [PATCH 08/14] OMAPDSS: DSS: add new clock calculation code Date: Fri, 8 Mar 2013 13:52:43 +0200 Message-ID: <1362743569-10289-9-git-send-email-tomi.valkeinen@ti.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1362743569-10289-1-git-send-email-tomi.valkeinen@ti.com> References: <1362743569-10289-1-git-send-email-tomi.valkeinen@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Add new way to iterate over DSS clock divisors. dss_div_calc() provides a generic way to go over all the divisors, within given clock range. dss_div_calc() will call a callback function for each divider set, making the function reusable for all use cases. Signed-off-by: Tomi Valkeinen --- drivers/video/omap2/dss/dss.c | 36 ++++++++++++++++++++++++++++++++++++ drivers/video/omap2/dss/dss.h | 3 +++ 2 files changed, 39 insertions(+) diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c index 054c2a2..21a3dc8 100644 --- a/drivers/video/omap2/dss/dss.c +++ b/drivers/video/omap2/dss/dss.c @@ -473,6 +473,42 @@ int dss_calc_clock_rates(struct dss_clock_info *cinfo) return 0; } +bool dss_div_calc(unsigned long fck_min, dss_div_calc_func func, void *data) +{ + int fckd, fckd_start, fckd_stop; + unsigned long fck; + unsigned long fck_hw_max; + unsigned long fckd_hw_max; + unsigned long prate; + + if (dss.dpll4_m4_ck == NULL) { + /* XXX can we change the clock on omap2? */ + fck = clk_get_rate(dss.dss_clk); + fckd = 1; + + return func(fckd, fck, data); + } + + fck_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK); + fckd_hw_max = dss.feat->fck_div_max; + + prate = dss_get_dpll4_rate() * dss.feat->dss_fck_multiplier; + + fck_min = fck_min ? fck_min : 1; + + fckd_start = min(prate / fck_min, fckd_hw_max); + fckd_stop = max(DIV_ROUND_UP(prate, fck_hw_max), 1ul); + + for (fckd = fckd_start; fckd >= fckd_stop; --fckd) { + fck = prate / fckd; + + if (func(fckd, fck, data)) + return true; + } + + return false; +} + int dss_set_clock_div(struct dss_clock_info *cinfo) { if (dss.dpll4_m4_ck) { diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h index 0ff41dd..4180302 100644 --- a/drivers/video/omap2/dss/dss.h +++ b/drivers/video/omap2/dss/dss.h @@ -271,6 +271,9 @@ int dss_set_clock_div(struct dss_clock_info *cinfo); int dss_calc_clock_div(unsigned long req_pck, struct dss_clock_info *dss_cinfo, struct dispc_clock_info *dispc_cinfo); +typedef bool (*dss_div_calc_func)(int fckd, unsigned long fck, void *data); +bool dss_div_calc(unsigned long fck_min, dss_div_calc_func func, void *data); + /* SDI */ int sdi_init_platform_driver(void) __init; void sdi_uninit_platform_driver(void) __exit;