From patchwork Tue Aug 22 12:10:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nautiyal, Ankit K" X-Patchwork-Id: 13360570 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A696BEE49A4 for ; Tue, 22 Aug 2023 12:14:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 423A610E344; Tue, 22 Aug 2023 12:14:00 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9B02510E343 for ; Tue, 22 Aug 2023 12:13:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; 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22 Aug 2023 05:13:56 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org Date: Tue, 22 Aug 2023 17:40:31 +0530 Message-Id: <20230822121033.597447-8-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230822121033.597447-1-ankit.k.nautiyal@intel.com> References: <20230822121033.597447-1-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 7/9] drm/i915/dp: Iterate over output bpp with fractional step size 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: , Cc: manasi.d.navare@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This patch adds support to iterate over compressed output bpp as per the fractional step, supported by DP sink. v2: -Avoid ending up with compressed bpp, same as pipe bpp. (Stan) Signed-off-by: Ankit Nautiyal --- drivers/gpu/drm/i915/display/intel_dp.c | 36 ++++++++++++++++--------- 1 file changed, 23 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 436889c601b1..011bcfe2ecc5 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -1715,15 +1715,15 @@ static bool intel_dp_dsc_supports_format(struct intel_dp *intel_dp, return drm_dp_dsc_sink_supports_format(intel_dp->dsc_dpcd, sink_dsc_format); } -static bool is_bw_sufficient_for_dsc_config(u16 compressed_bpp, u32 link_clock, +static bool is_bw_sufficient_for_dsc_config(u16 compressed_bppx16, u32 link_clock, u32 lane_count, u32 mode_clock, enum intel_output_format output_format, int timeslots) { u32 available_bw, required_bw; - available_bw = (link_clock * lane_count * timeslots) / 8; - required_bw = compressed_bpp * (intel_dp_mode_to_fec_clock(mode_clock)); + available_bw = (link_clock * lane_count * timeslots * 16) / 8; + required_bw = compressed_bppx16 * (intel_dp_mode_to_fec_clock(mode_clock)); return available_bw > required_bw; } @@ -1731,7 +1731,7 @@ static bool is_bw_sufficient_for_dsc_config(u16 compressed_bpp, u32 link_clock, static int dsc_compute_link_config(struct intel_dp *intel_dp, struct intel_crtc_state *pipe_config, struct link_config_limits *limits, - u16 compressed_bpp, + u16 compressed_bppx16, int timeslots) { const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode; @@ -1746,7 +1746,8 @@ static int dsc_compute_link_config(struct intel_dp *intel_dp, for (lane_count = limits->min_lane_count; lane_count <= limits->max_lane_count; lane_count <<= 1) { - if (!is_bw_sufficient_for_dsc_config(compressed_bpp, link_rate, lane_count, + + if (!is_bw_sufficient_for_dsc_config(compressed_bppx16, link_rate, lane_count, adjusted_mode->clock, pipe_config->output_format, timeslots)) @@ -1860,7 +1861,7 @@ icl_dsc_compute_link_config(struct intel_dp *intel_dp, ret = dsc_compute_link_config(intel_dp, pipe_config, limits, - valid_dsc_bpp[i], + valid_dsc_bpp[i] << 4, timeslots); if (ret == 0) { pipe_config->dsc.compressed_bpp = valid_dsc_bpp[i]; @@ -1886,22 +1887,31 @@ xelpd_dsc_compute_link_config(struct intel_dp *intel_dp, int pipe_bpp, int timeslots) { - u16 compressed_bpp; + u8 bppx16_incr = drm_dp_dsc_sink_bpp_incr(intel_dp->dsc_dpcd); + struct drm_i915_private *i915 = dp_to_i915(intel_dp); + u16 compressed_bppx16; + u8 bppx16_step; int ret; + if (DISPLAY_VER(i915) < 14 || bppx16_incr <= 1) + bppx16_step = 16; + else + bppx16_step = 16 / bppx16_incr; + /* Compressed BPP should be less than the Input DSC bpp */ - dsc_max_bpp = min(dsc_max_bpp, pipe_bpp - 1); + dsc_max_bpp = min(dsc_max_bpp << 4, (pipe_bpp << 4) - bppx16_step); + dsc_min_bpp = dsc_min_bpp << 4; - for (compressed_bpp = dsc_max_bpp; - compressed_bpp >= dsc_min_bpp; - compressed_bpp--) { + for (compressed_bppx16 = dsc_max_bpp; + compressed_bppx16 >= dsc_min_bpp; + compressed_bppx16 -= bppx16_step) { ret = dsc_compute_link_config(intel_dp, pipe_config, limits, - compressed_bpp, + compressed_bppx16, timeslots); if (ret == 0) { - pipe_config->dsc.compressed_bpp = compressed_bpp << 4; + pipe_config->dsc.compressed_bpp = compressed_bppx16; return 0; } }