From patchwork Thu May 7 17:38:42 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lespiau, Damien" X-Patchwork-Id: 6359901 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1641A9F1C2 for ; Thu, 7 May 2015 17:39:02 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 364C9202FE for ; Thu, 7 May 2015 17:39:01 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 39C30202EC for ; Thu, 7 May 2015 17:39:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B37176E885; Thu, 7 May 2015 10:38:59 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTP id 4BE636E880 for ; Thu, 7 May 2015 10:38:56 -0700 (PDT) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 07 May 2015 10:38:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,384,1427785200"; d="scan'208";a="706830504" Received: from rpeel-mobl3.ger.corp.intel.com (HELO strange.ger.corp.intel.com) ([10.252.14.166]) by fmsmga001.fm.intel.com with ESMTP; 07 May 2015 10:38:55 -0700 From: Damien Lespiau To: intel-gfx@lists.freedesktop.org Date: Thu, 7 May 2015 18:38:42 +0100 Message-Id: <1431020329-11414-7-git-send-email-damien.lespiau@intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1431020329-11414-1-git-send-email-damien.lespiau@intel.com> References: <1431020329-11414-1-git-send-email-damien.lespiau@intel.com> Subject: [Intel-gfx] [PATCH 06/13] drm/i915/skl: Factor out computing the DPLL paramaters from the dividers X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This part doesn't depend on how we compute the DPLL dividers (p and p0/p1/p2) and can be reused even if we change the algorithm to do so. (something that is planned for a followup patch) Signed-off-by: Damien Lespiau --- drivers/gpu/drm/i915/intel_ddi.c | 139 +++++++++++++++++++++------------------ 1 file changed, 75 insertions(+), 64 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 54ba03d..43b0b56 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1111,6 +1111,75 @@ struct skl_wrpll_params { uint32_t central_freq; }; +static void skl_wrpll_params_populate(struct skl_wrpll_params *params, + uint64_t afe_clock, + uint64_t central_freq, + uint32_t p0, uint32_t p1, uint32_t p2) +{ + uint64_t dco_freq; + + params->central_freq = central_freq; + + switch (central_freq) { + case 9600000000ULL: + params->central_freq = 0; + break; + case 9000000000ULL: + params->central_freq = 1; + break; + case 8400000000ULL: + params->central_freq = 3; + } + + switch (p0) { + case 1: + params->pdiv = 0; + break; + case 2: + params->pdiv = 1; + break; + case 3: + params->pdiv = 2; + break; + case 7: + params->pdiv = 4; + break; + default: + WARN(1, "Incorrect PDiv\n"); + } + + switch (p2) { + case 5: + params->kdiv = 0; + break; + case 2: + params->kdiv = 1; + break; + case 3: + params->kdiv = 2; + break; + case 1: + params->kdiv = 3; + break; + default: + WARN(1, "Incorrect KDiv\n"); + } + + params->qdiv_ratio = p1; + params->qdiv_mode = (params->qdiv_ratio == 1) ? 0 : 1; + + dco_freq = p0 * p1 * p2 * afe_clock; + + /* + * Intermediate values are in Hz. + * Divide by MHz to match bsepc + */ + params->dco_integer = div_u64(dco_freq, (24 * MHz(1))); + params->dco_fraction = + div_u64(((div_u64(dco_freq, 24) - + params->dco_integer * MHz(1)) * 0x8000), MHz(1)); +} + static bool skl_ddi_calculate_wrpll(int clock /* in Hz */, struct skl_wrpll_params *wrpll_params) @@ -1130,7 +1199,6 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */, uint32_t dco_central_freq_deviation[3]; uint32_t i, P1, k, dco_count; bool retry_with_odd = false; - uint64_t dco_freq; /* Determine P0, P1 or P2 */ for (dco_count = 0; dco_count < 3; dco_count++) { @@ -1193,69 +1261,12 @@ found: "No valid parameters found for pixel clock: %dHz\n", clock)) return false; - wrpll_params->central_freq = dco_central_freq[min_dco_index]; - - switch (dco_central_freq[min_dco_index]) { - case 9600000000ULL: - wrpll_params->central_freq = 0; - break; - case 9000000000ULL: - wrpll_params->central_freq = 1; - break; - case 8400000000ULL: - wrpll_params->central_freq = 3; - } - - switch (candidate_p0[min_dco_index]) { - case 1: - wrpll_params->pdiv = 0; - break; - case 2: - wrpll_params->pdiv = 1; - break; - case 3: - wrpll_params->pdiv = 2; - break; - case 7: - wrpll_params->pdiv = 4; - break; - default: - WARN(1, "Incorrect PDiv\n"); - } - - switch (candidate_p2[min_dco_index]) { - case 5: - wrpll_params->kdiv = 0; - break; - case 2: - wrpll_params->kdiv = 1; - break; - case 3: - wrpll_params->kdiv = 2; - break; - case 1: - wrpll_params->kdiv = 3; - break; - default: - WARN(1, "Incorrect KDiv\n"); - } - - wrpll_params->qdiv_ratio = candidate_p1[min_dco_index]; - wrpll_params->qdiv_mode = - (wrpll_params->qdiv_ratio == 1) ? 0 : 1; - - dco_freq = candidate_p0[min_dco_index] * - candidate_p1[min_dco_index] * - candidate_p2[min_dco_index] * afe_clock; - - /* - * Intermediate values are in Hz. - * Divide by MHz to match bsepc - */ - wrpll_params->dco_integer = div_u64(dco_freq, (24 * MHz(1))); - wrpll_params->dco_fraction = - div_u64(((div_u64(dco_freq, 24) - - wrpll_params->dco_integer * MHz(1)) * 0x8000), MHz(1)); + skl_wrpll_params_populate(wrpll_params, + afe_clock, + dco_central_freq[min_dco_index], + candidate_p0[min_dco_index], + candidate_p1[min_dco_index], + candidate_p2[min_dco_index]); return true; }