From patchwork Sat Feb 17 18:47:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Ond=C5=99ej_Jirman?= X-Patchwork-Id: 13561506 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 3731CC48BC4 for ; Sat, 17 Feb 2024 18:47:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 11F3210E1AD; Sat, 17 Feb 2024 18:47:25 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; secure) header.d=xff.cz header.i=@xff.cz header.b="nrGm2lL8"; dkim-atps=neutral Received: from vps.xff.cz (vps.xff.cz [195.181.215.36]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2F5B010E293 for ; Sat, 17 Feb 2024 18:47:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=xff.cz; s=mail; t=1708195642; bh=M7kFL6IVY5bC9B0FS4qqIwBemjDZhp54+jL5ahTfYbk=; h=From:To:Cc:Subject:Date:From; b=nrGm2lL8aZW3rvmIDuLQAapt+SGeUWtVznCP3ghwOu7Ivq2TiYeE//Sl2NJGQIu3k ZL/fE1Yz0f26hI7bnNryID4CMZPzGSiqWpZm302C2g6hy9+mJchtxjYxFOv+JODHjd doD8ZpWYUZsWi2gR8r106LG4LB1oOiTX0iw5WMKk= From: =?utf-8?q?Ond=C5=99ej_Jirman?= To: linux-kernel@vger.kernel.org Cc: Ondrej Jirman , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org (open list:DRM DRIVERS FOR ROCKCHIP), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Rockchip SoC support), linux-rockchip@lists.infradead.org (open list:ARM/Rockchip SoC support) Subject: [PATCH] drm: rockchip: dw-mipi-dsi: Fix hsclk calculation for non-burst video modes Date: Sat, 17 Feb 2024 19:47:15 +0100 Message-ID: <20240217184720.1753730-1-megi@xff.cz> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Ondrej Jirman For panels that don't use video burst mode, hsclock should match the pixel clock * bpp / lane exactly. This fixes display image corruption on Pinephone Pro, which doesn't use video burst mode to drive the panel. To simplify the addition of exact fout calculation for non-burst modes, the code is re-organized in order to not redo the same calculation multiple times, and to use identical algorithm for per-lane bitrate for internal and external dphy use cases. Signed-off-by: Ondrej Jirman --- .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 28 ++++++++----------- 1 file changed, 12 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c index 4cc8ed8f4fbd..7468324872ec 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c @@ -548,8 +548,6 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode, { struct dw_mipi_dsi_rockchip *dsi = priv_data; int bpp; - unsigned long mpclk, tmp; - unsigned int target_mbps = 1000; unsigned int max_mbps = dppa_map[ARRAY_SIZE(dppa_map) - 1].max_mbps; unsigned long best_freq = 0; unsigned long fvco_min, fvco_max, fin, fout; @@ -567,30 +565,28 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode, return bpp; } - mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC); - if (mpclk) { - /* take 1 / 0.8, since mbps must big than bandwidth of RGB */ - tmp = mpclk * (bpp / lanes) * 10 / 8; - if (tmp < max_mbps) - target_mbps = tmp; - else - DRM_DEV_ERROR(dsi->dev, - "DPHY clock frequency is out of range\n"); + fout = mode->clock * bpp / lanes; + if (mode_flags & MIPI_DSI_MODE_VIDEO_BURST) + fout = fout * 10 / 8; + fout *= MSEC_PER_SEC; + + if (fout > max_mbps * USEC_PER_SEC) { + DRM_DEV_ERROR(dsi->dev, + "DPHY clock frequency is out of range\n"); + return -EINVAL; } - /* for external phy only a the mipi_dphy_config is necessary */ + /* for external phy only the mipi_dphy_config is necessary */ if (dsi->phy) { - phy_mipi_dphy_get_default_config(mode->clock * 1000 * 10 / 8, - bpp, lanes, + phy_mipi_dphy_get_default_config_for_hsclk(fout, lanes, &dsi->phy_opts.mipi_dphy); - dsi->lane_mbps = target_mbps; + dsi->lane_mbps = DIV_ROUND_UP(fout, USEC_PER_SEC); *lane_mbps = dsi->lane_mbps; return 0; } fin = clk_get_rate(dsi->pllref_clk); - fout = target_mbps * USEC_PER_SEC; /* constraint: 5Mhz <= Fref / N <= 40MHz */ min_prediv = DIV_ROUND_UP(fin, 40 * USEC_PER_SEC);