| Message ID | 20181113111633.20189-12-jagan@amarulasolutions.com |
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[209.85.220.65]) by mx.google.com with SMTPS id k33-v6sor22594354pld.54.2018.11.13.03.17.59 for <linux-amarula@amarulasolutions.com> (Google Transport Security); Tue, 13 Nov 2018 03:17:59 -0800 (PST) Received-SPF: pass (google.com: domain of jagan@amarulasolutions.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; X-Received: by 2002:a17:902:8a88:: with SMTP id p8-v6mr4582115plo.94.1542107879320; Tue, 13 Nov 2018 03:17:59 -0800 (PST) Received: from localhost.localdomain ([2401:4900:3670:3f11:bc71:2ef7:4a39:e260]) by smtp.gmail.com with ESMTPSA id 27-v6sm28531377pfm.36.2018.11.13.03.17.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Nov 2018 03:17:58 -0800 (PST) From: Jagan Teki <jagan@amarulasolutions.com> To: Maxime Ripard <maxime.ripard@bootlin.com>, Chen-Yu Tsai <wens@csie.org>, Icenowy Zheng <icenowy@aosc.io>, Jernej Skrabec <jernej.skrabec@siol.net>, Vasily Khoruzhick <anarsoul@gmail.com>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, linux-clk@vger.kernel.org, Michael Trimarchi <michael@amarulasolutions.com>, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, linux-amarula@amarulasolutions.com Cc: Jagan Teki <jagan@amarulasolutions.com> Subject: [PATCH v4 11/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value Date: Tue, 13 Nov 2018 16:46:18 +0530 Message-Id: <20181113111633.20189-12-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.18.0.321.gffc6fa0e3 In-Reply-To: <20181113111633.20189-1-jagan@amarulasolutions.com> References: <20181113111633.20189-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Original-Sender: jagan@amarulasolutions.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@amarulasolutions.com header.s=google header.b=H+CM64Jc; spf=pass (google.com: domain of jagan@amarulasolutions.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=jagan@amarulasolutions.com Precedence: list Mailing-list: list linux-amarula@amarulasolutions.com; contact linux-amarula+owners@amarulasolutions.com List-ID: <linux-amarula.amarulasolutions.com> X-Spam-Checked-In-Group: linux-amarula@amarulasolutions.com X-Google-Group-Id: 476853432473 List-Post: <https://groups.google.com/a/amarulasolutions.com/group/linux-amarula/post>, <mailto:linux-amarula@amarulasolutions.com> List-Help: <https://support.google.com/a/amarulasolutions.com/bin/topic.py?topic=25838>, <mailto:linux-amarula+help@amarulasolutions.com> List-Archive: <https://groups.google.com/a/amarulasolutions.com/group/linux-amarula/> List-Unsubscribe: <mailto:googlegroups-manage+476853432473+unsubscribe@googlegroups.com>, <https://groups.google.com/a/amarulasolutions.com/group/linux-amarula/subscribe> |
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diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index f6e3df8d2490..de0992052a90 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -482,7 +482,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HBP_PACKET_OVERHEAD 6 hbp = max((unsigned int)HBP_PACKET_OVERHEAD, - (mode->hsync_start - mode->hdisplay) * Bpp - HBP_PACKET_OVERHEAD); + (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD); /* * The frontporch is set using a blanking packet (4 bytes +
Current driver is calculating hbp maximum value by subtracting hsync_start with hdisplay which is front porch value, but the hbp refers to back porch. Back porch value is calculating by subtracting htotal with hsync_end as per drm_mode timings, and BSP code from BPI-M64-bsp is eventually following the same. BPI-M64-bsp is computing hbp as (in drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c) dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2); => (panel->lcd_hbp - timmings->hor_sync_time) => (timmings->hor_back_porch + timmings->hor_sync_time - timmings->hor_sync_time) => timmings->hor_back_porch => mode->htotal - mode->hsync_end So, update the MIPI-DSI hbp value accordingly. Tested on 2-lane, 4-lane DSI LCD panels. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)