From patchwork Thu Sep 2 10:08:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lee, Shawn C" X-Patchwork-Id: 12471173 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 745F1C4320A for ; Thu, 2 Sep 2021 10:05:51 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1D54A61057 for ; Thu, 2 Sep 2021 10:05:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1D54A61057 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A84F6E4C7; Thu, 2 Sep 2021 10:05:50 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9C64A6E4CD for ; Thu, 2 Sep 2021 10:05:48 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10094"; a="198611209" X-IronPort-AV: E=Sophos;i="5.84,372,1620716400"; d="scan'208";a="198611209" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Sep 2021 03:05:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,372,1620716400"; d="scan'208";a="510920657" Received: from shawnle1-build-machine.itwn.intel.com ([10.5.253.12]) by orsmga001.jf.intel.com with ESMTP; 02 Sep 2021 03:05:46 -0700 From: Lee Shawn C To: intel-gfx@lists.freedesktop.org Cc: jani.nikula@intel.com, ville.syrjala@linux.intel.com, vandita.kulkarni@intel.com, cooper.chiou@intel.com, william.tseng@intel.com, Lee Shawn C , Jani Nikula Date: Thu, 2 Sep 2021 18:08:50 +0800 Message-Id: <20210902100851.21719-5-shawn.c.lee@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210902100851.21719-1-shawn.c.lee@intel.com> References: <20210902100851.21719-1-shawn.c.lee@intel.com> Subject: [Intel-gfx] [v2 4/5] drm/i915/dsi: Retrieve max brightness level from VBT X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" So far, DCS backlight driver hardcode (0xFF) for max brightness level. MIPI DCS spec allow max 0xFFFF for set_display_brightness (51h) command. And VBT brightness precision bits can support 8 ~ 16 bits. We should set correct precision bits in VBT that meet panel's request. Driver can refer to this setting then configure max brightness level in DCS backlight driver properly. v2: modify variable name brightness_precision_bits instead of max_brightness_level. Cc: Ville Syrjala Cc: Jani Nikula Cc: Vandita Kulkarni Cc: Cooper Chiou Cc: William Tseng Signed-off-by: Lee Shawn C --- drivers/gpu/drm/i915/display/intel_bios.c | 3 +++ drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c | 8 ++++++-- drivers/gpu/drm/i915/i915_drv.h | 1 + 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index e86e6ed2d3bf..ccaf0a3100f7 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -483,6 +483,9 @@ parse_lfp_backlight(struct drm_i915_private *i915, level = 255; } i915->vbt.backlight.min_brightness = min_level; + + i915->vbt.backlight.brightness_precision_bits = + backlight_data->brightness_precision_bits[panel_type]; } else { level = backlight_data->level[panel_type]; i915->vbt.backlight.min_brightness = entry->min_brightness; diff --git a/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c b/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c index 584c14c4cbd0..21ab9e1acb57 100644 --- a/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c @@ -147,10 +147,14 @@ static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state, static int dcs_setup_backlight(struct intel_connector *connector, enum pipe unused) { + struct drm_device *dev = connector->base.dev; + struct drm_i915_private *dev_priv = to_i915(dev); struct intel_panel *panel = &connector->panel; - panel->backlight.max = PANEL_PWM_MAX_VALUE; - panel->backlight.level = PANEL_PWM_MAX_VALUE; + panel->backlight.max = (dev_priv->vbt.backlight.brightness_precision_bits > 8) \ + ? (1 << dev_priv->vbt.backlight.brightness_precision_bits) - 1 \ + : PANEL_PWM_MAX_VALUE; + panel->backlight.level = panel->backlight.max; return 0; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index be2392bbcecc..99a2d308b24d 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -705,6 +705,7 @@ struct intel_vbt_data { struct { u16 pwm_freq_hz; + u16 brightness_precision_bits; bool present; bool active_low_pwm; u8 min_brightness; /* min_brightness/255 of max */