From patchwork Mon Nov 25 17:27:08 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paulo Zanoni X-Patchwork-Id: 3233521 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9BFB7C045B for ; Mon, 25 Nov 2013 17:27:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 49138201D3 for ; Mon, 25 Nov 2013 17:27:30 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id ED489201CD for ; Mon, 25 Nov 2013 17:27:28 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 87C84FAA1A; Mon, 25 Nov 2013 09:27:26 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-qa0-f51.google.com (mail-qa0-f51.google.com [209.85.216.51]) by gabe.freedesktop.org (Postfix) with ESMTP id 17B3DFAA1A for ; Mon, 25 Nov 2013 09:27:22 -0800 (PST) Received: by mail-qa0-f51.google.com with SMTP id o15so7660632qap.3 for ; Mon, 25 Nov 2013 09:27:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=MJQ+TSallEgZobbfV+PnPMZoMsHFMa1jrVdV5DBBzqE=; b=OaoXVK3XGwGxOgqjzN9S2GlTV7QRdjraCxIv4+HsyqDcYFQqtkh891MkWQO3P1x3sa GVjpL/qAexyu+9SnJqx31wXxU5oxu0J/Iix9Za6zHcQsMa8liQEpBdzk9pHzQSfQ041Y 00tRw3VVpm6valX7SpUojnjX7RgDtcM7xzfJmBHNTh/+KXX4DcmTnGSR87P1bEM26Nke gfU2FU2zcEZ9zJ57qaMrNQaNbn3Fkb7dpvpKrnFBXtllAkXiJnBkv/1OGGRVi1+Q17dY Sgzlq8GCsfA/WKHHvFgAMQ8V7tp923n3/qQYTomI+XwkH1P10/tSNloSBNXFbjCMOunI dP4w== X-Received: by 10.224.25.195 with SMTP id a3mr5106026qac.102.1385400439580; Mon, 25 Nov 2013 09:27:19 -0800 (PST) Received: from localhost.localdomain ([177.42.100.87]) by mx.google.com with ESMTPSA id lc1sm111264475qeb.5.2013.11.25.09.27.18 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Nov 2013 09:27:18 -0800 (PST) From: Paulo Zanoni To: intel-gfx@lists.freedesktop.org Date: Mon, 25 Nov 2013 15:27:08 -0200 Message-Id: <1385400428-1597-1-git-send-email-przanoni@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <20131118120647.GB10162@strange.amr.corp.intel.com> References: <20131118120647.GB10162@strange.amr.corp.intel.com> Cc: Paulo Zanoni Subject: [Intel-gfx] [PATCH] drm/i915: split intel_ddi_pll_mode_set in 2 pieces X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, 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 From: Paulo Zanoni The first piece, intel_ddi_pll_select, finds a PLL and assigns it to the CRTC, but doesn't write any register. It can also fail in case it doesn't find a PLL. The second piece, intel_ddi_pll_enable, uses the information stored by intel_ddi_pll_select to actually enable the PLL by writing to its register. This function can't fail. We also have some refcount sanity checks here. The idea is that one day we'll remove all the functions that touch registers from haswell_crtc_mode_set to haswell_crtc_enable, so we'll call intel_ddi_pll_select at haswell_crtc_mode_set and then call intel_ddi_pll_enable at haswell_crtc_enable. Since I'm already touching this code, let's take care of this particular split today. v2: - Clock on the debug message is in KHz - Add missing POSTING_READ Signed-off-by: Paulo Zanoni Reviewed-by: Damien Lespiau --- drivers/gpu/drm/i915/intel_ddi.c | 102 ++++++++++++++++++++++++++++------- drivers/gpu/drm/i915/intel_display.c | 3 +- drivers/gpu/drm/i915/intel_drv.h | 3 +- 3 files changed, 88 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 731a919..4263ec3 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -696,21 +696,21 @@ intel_ddi_calculate_wrpll(int clock /* in Hz */, *n2_out = best.n2; *p_out = best.p; *r2_out = best.r2; - - DRM_DEBUG_KMS("WRPLL: %dHz refresh rate with p=%d, n2=%d r2=%d\n", - clock, *p_out, *n2_out, *r2_out); } -bool intel_ddi_pll_mode_set(struct drm_crtc *crtc) +/* Tries to find a PLL for the CRTC. If it finds, it increases the refcount and + * stores it in intel_crtc->ddi_pll_sel, so other mode sets won't be able to + * steal the selected PLL. You need to call intel_ddi_pll_enable to actually + * enable the PLL. */ +bool intel_ddi_pll_select(struct intel_crtc *intel_crtc) { - struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + struct drm_crtc *crtc = &intel_crtc->base; struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc); struct drm_encoder *encoder = &intel_encoder->base; struct drm_i915_private *dev_priv = crtc->dev->dev_private; struct intel_ddi_plls *plls = &dev_priv->ddi_plls; int type = intel_encoder->type; enum pipe pipe = intel_crtc->pipe; - uint32_t reg, val; int clock = intel_crtc->config.port_clock; intel_ddi_put_crtc_pll(crtc); @@ -734,10 +734,8 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc) return false; } - /* We don't need to turn any PLL on because we'll use LCPLL. */ - return true; - } else if (type == INTEL_OUTPUT_HDMI) { + uint32_t reg, val; unsigned p, n2, r2; intel_ddi_calculate_wrpll(clock * 1000, &r2, &n2, &p); @@ -767,6 +765,9 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc) return false; } + DRM_DEBUG_KMS("WRPLL: %dKHz refresh rate with p=%d, n2=%d r2=%d\n", + clock, p, n2, r2); + if (reg == WRPLL_CTL1) { plls->wrpll1_refcount++; intel_crtc->ddi_pll_sel = PORT_CLK_SEL_WRPLL1; @@ -780,29 +781,94 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc) DRM_DEBUG_KMS("Using SPLL on pipe %c\n", pipe_name(pipe)); plls->spll_refcount++; - reg = SPLL_CTL; intel_crtc->ddi_pll_sel = PORT_CLK_SEL_SPLL; } else { DRM_ERROR("SPLL already in use\n"); return false; } - WARN(I915_READ(reg) & SPLL_PLL_ENABLE, - "SPLL already enabled\n"); - - val = SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC; - } else { WARN(1, "Invalid DDI encoder type %d\n", type); return false; } - I915_WRITE(reg, val); - udelay(20); - return true; } +/* To be called after intel_ddi_pll_select(). That one selects the PLL to be + * used, this one actually enables the PLL. */ +void intel_ddi_pll_enable(struct intel_crtc *crtc) +{ + struct drm_device *dev = crtc->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_ddi_plls *plls = &dev_priv->ddi_plls; + int clock = crtc->config.port_clock; + uint32_t reg, cur_val, new_val; + int refcount; + const char *pll_name; + uint32_t enable_bit = (1 << 31); + unsigned int p, n2, r2; + + BUILD_BUG_ON(enable_bit != SPLL_PLL_ENABLE); + BUILD_BUG_ON(enable_bit != WRPLL_PLL_ENABLE); + + switch (crtc->ddi_pll_sel) { + case PORT_CLK_SEL_LCPLL_2700: + case PORT_CLK_SEL_LCPLL_1350: + case PORT_CLK_SEL_LCPLL_810: + /* LCPLL should always be enabled at this point of the mode set + * sequence, so nothing to do. */ + return; + + case PORT_CLK_SEL_SPLL: + pll_name = "SPLL"; + reg = SPLL_CTL; + refcount = plls->spll_refcount; + new_val = SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | + SPLL_PLL_SSC; + break; + + case PORT_CLK_SEL_WRPLL1: + case PORT_CLK_SEL_WRPLL2: + if (crtc->ddi_pll_sel == PORT_CLK_SEL_WRPLL1) { + pll_name = "WRPLL1"; + reg = WRPLL_CTL1; + refcount = plls->wrpll1_refcount; + } else { + pll_name = "WRPLL2"; + reg = WRPLL_CTL2; + refcount = plls->wrpll2_refcount; + } + + intel_ddi_calculate_wrpll(clock * 1000, &r2, &n2, &p); + + new_val = WRPLL_PLL_ENABLE | WRPLL_PLL_SELECT_LCPLL_2700 | + WRPLL_DIVIDER_REFERENCE(r2) | + WRPLL_DIVIDER_FEEDBACK(n2) | WRPLL_DIVIDER_POST(p); + + break; + + case PORT_CLK_SEL_NONE: + WARN(1, "Bad selected pll: PORT_CLK_SEL_NONE\n"); + return; + default: + WARN(1, "Bad selected pll: 0x%08x\n", crtc->ddi_pll_sel); + return; + } + + cur_val = I915_READ(reg); + + WARN(refcount < 1, "Bad %s refcount: %d\n", pll_name, refcount); + if (refcount == 1) { + WARN(cur_val & enable_bit, "%s already enabled\n", pll_name); + I915_WRITE(reg, new_val); + POSTING_READ(reg); + udelay(20); + } else { + WARN((cur_val & enable_bit) == 0, "%s disabled\n", pll_name); + } +} + void intel_ddi_set_pipe_settings(struct drm_crtc *crtc) { struct drm_i915_private *dev_priv = crtc->dev->dev_private; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e85d838..667f641 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6880,8 +6880,9 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc, int plane = intel_crtc->plane; int ret; - if (!intel_ddi_pll_mode_set(crtc)) + if (!intel_ddi_pll_select(intel_crtc)) return -EINVAL; + intel_ddi_pll_enable(intel_crtc); if (intel_crtc->config.has_dp_encoder) intel_dp_set_m_n(intel_crtc); diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0231281..76f52b6 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -612,7 +612,8 @@ void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv, void intel_ddi_enable_pipe_clock(struct intel_crtc *intel_crtc); void intel_ddi_disable_pipe_clock(struct intel_crtc *intel_crtc); void intel_ddi_setup_hw_pll_state(struct drm_device *dev); -bool intel_ddi_pll_mode_set(struct drm_crtc *crtc); +bool intel_ddi_pll_select(struct intel_crtc *crtc); +void intel_ddi_pll_enable(struct intel_crtc *crtc); void intel_ddi_put_crtc_pll(struct drm_crtc *crtc); void intel_ddi_set_pipe_settings(struct drm_crtc *crtc); void intel_ddi_prepare_link_retrain(struct drm_encoder *encoder);