From patchwork Fri Feb  8 09:53:21 2019
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Maxime Ripard <maxime.ripard@bootlin.com>
X-Patchwork-Id: 10802605
Return-Path: 
 <linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org>
Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org
 [172.30.200.125])
	by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E6353746
	for <patchwork-linux-arm@patchwork.kernel.org>;
 Fri,  8 Feb 2019 09:55:44 +0000 (UTC)
Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1])
	by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D32DE2B870
	for <patchwork-linux-arm@patchwork.kernel.org>;
 Fri,  8 Feb 2019 09:55:44 +0000 (UTC)
Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486)
	id C71232C4BB; Fri,  8 Feb 2019 09:55:44 +0000 (UTC)
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
	pdx-wl-mail.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1
Received: from bombadil.infradead.org (bombadil.infradead.org
 [198.137.202.133])
	(using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B965E2B870
	for <patchwork-linux-arm@patchwork.kernel.org>;
 Fri,  8 Feb 2019 09:55:43 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
	d=lists.infradead.org; s=bombadil.20170209; h=Sender:
	Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post:
	List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:
	Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description:
	Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:
	List-Owner; bh=hpJCZ9EA/UPZOHxdpsDU4XifrJKzufSzSYvDdt789W0=; b=MntcKKkc81i5p9
	pXqCX8yfeRF5I8WUy4MPCoiEiUxGg+mzkjPxbKPoxF/3mpmM3dX2qLTnJpiHTxw3yXtlFPJqkseRx
	E6zr76bmbZD8L/2i88pLRXOkMNjvNSR6aKYPHqngCb9X+g7E8M7bI7AiP5Je7yQTf7eLVkrhiXPDV
	+lF9NN2TkB9LMpIB+I4/oRRRXYtQppyn2QXN+coZBzB+7oYjWK53FVenbMQjSJ4eD/h0Ks/3Vvyxh
	4NSRNsHS35G8jNlvGpCFMtR/qSmoMKtyWCtpXyliC/iOJZK2YoclCpyIcF1gTESfuSi+WLoEhqNBp
	iUQb3ygd4SgZrYr4CmQw==;
Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org)
	by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux))
	id 1gs2sn-0006Yu-OF; Fri, 08 Feb 2019 09:55:41 +0000
Received: from relay12.mail.gandi.net ([217.70.178.232])
 by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux))
 id 1gs2qz-0003Wu-1o
 for linux-arm-kernel@lists.infradead.org; Fri, 08 Feb 2019 09:54:00 +0000
Received: from localhost (aaubervilliers-681-1-80-177.w90-88.abo.wanadoo.fr
 [90.88.22.177]) (Authenticated sender: maxime.ripard@bootlin.com)
 by relay12.mail.gandi.net (Postfix) with ESMTPSA id D48B8200017;
 Fri,  8 Feb 2019 09:53:45 +0000 (UTC)
From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Sean Paul <seanpaul@chromium.org>,
 Maxime Ripard <maxime.ripard@bootlin.com>
Subject: [PATCH v2 8/9] drm/sun4i: dsi: Add burst support
Date: Fri,  8 Feb 2019 10:53:21 +0100
Message-Id: 
 <1dcabf2b38d3f0d3387b1cf02575e3d14e3ecd4e.1549619502.git-series.maxime.ripard@bootlin.com>
X-Mailer: git-send-email 2.20.1
In-Reply-To: 
 <cover.23dbbc9b943ff8f36253ac7c617e2eda142b1b69.1549619502.git-series.maxime.ripard@bootlin.com>
References: 
 <cover.23dbbc9b943ff8f36253ac7c617e2eda142b1b69.1549619502.git-series.maxime.ripard@bootlin.com>
MIME-Version: 1.0
X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 
X-CRM114-CacheID: sfid-20190208_015350_178787_1BA718CD 
X-CRM114-Status: GOOD (  17.99  )
X-BeenThere: linux-arm-kernel@lists.infradead.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: <linux-arm-kernel.lists.infradead.org>
List-Unsubscribe: 
 <http://lists.infradead.org/mailman/options/linux-arm-kernel>,
 <mailto:linux-arm-kernel-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-arm-kernel/>
List-Post: <mailto:linux-arm-kernel@lists.infradead.org>
List-Help: <mailto:linux-arm-kernel-request@lists.infradead.org?subject=help>
List-Subscribe: 
 <http://lists.infradead.org/mailman/listinfo/linux-arm-kernel>,
 <mailto:linux-arm-kernel-request@lists.infradead.org?subject=subscribe>
Cc: Konstantin Sudakov <k.sudakov@integrasources.com>, bbrezillon@kernel.org,
 dri-devel@lists.freedesktop.org,
 Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
 Chen-Yu Tsai <wens@csie.org>,
 Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
 Jagan Teki <jagan@openedev.com>, linux-arm-kernel@lists.infradead.org
Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org>
Errors-To: 
 linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org
X-Virus-Scanned: ClamAV using ClamSMTP

From: Konstantin Sudakov <k.sudakov@integrasources.com>

The current driver doesn't support the DSI burst operation mode.

Let's add the needed quirks to make it work.

Signed-off-by: Konstantin Sudakov <k.sudakov@integrasources.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 171 ++++++++++++++++++++------
 1 file changed, 132 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index e0288e7dc64e..4cb715dc9100 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -23,7 +23,9 @@
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
 
+#include "sun4i_crtc.h"
 #include "sun4i_drv.h"
+#include "sun4i_tcon.h"
 #include "sun6i_mipi_dsi.h"
 
 #include <video/mipi_display.h>
@@ -32,6 +34,8 @@
 #define SUN6I_DSI_CTL_EN			BIT(0)
 
 #define SUN6I_DSI_BASIC_CTL_REG		0x00c
+#define SUN6I_DSI_BASIC_CTL_TRAIL_INV(n)		(((n) & 0xf) << 4)
+#define SUN6I_DSI_BASIC_CTL_TRAIL_FILL		BIT(3)
 #define SUN6I_DSI_BASIC_CTL_HBP_DIS		BIT(2)
 #define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS		BIT(1)
 #define SUN6I_DSI_BASIC_CTL_VIDEO_BURST		BIT(0)
@@ -152,6 +156,8 @@
 
 #define SUN6I_DSI_CMD_TX_REG(n)		(0x300 + (n) * 0x04)
 
+#define SUN6I_DSI_SYNC_POINT		40
+
 enum sun6i_dsi_start_inst {
 	DSI_START_LPRX,
 	DSI_START_LPTX,
@@ -366,13 +372,70 @@ static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
 	return max_t(u16, delay, 1);
 }
 
+static u16 sun6i_dsi_get_line_num(struct sun6i_dsi *dsi,
+				  struct drm_display_mode *mode)
+{
+	struct mipi_dsi_device *device = dsi->device;
+	unsigned Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
+
+	return mode->htotal * Bpp / device->lanes;
+}
+
+static u16 sun6i_dsi_get_drq_edge0(struct sun6i_dsi *dsi,
+				   struct drm_display_mode *mode,
+				   u16 line_num, u16 edge1)
+{
+	u16 edge0 = edge1;
+
+	edge0 += (mode->hdisplay + 40) * SUN6I_DSI_TCON_DIV / 8;
+
+	if (edge0 > line_num)
+		return edge0 - line_num;
+
+	return 1;
+}
+
+static u16 sun6i_dsi_get_drq_edge1(struct sun6i_dsi *dsi,
+				   struct drm_display_mode *mode,
+				   u16 line_num)
+{
+	struct mipi_dsi_device *device = dsi->device;
+	unsigned Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
+	unsigned hbp = mode->htotal - mode->hsync_end;
+	u16 edge1;
+
+	edge1 = SUN6I_DSI_SYNC_POINT;
+	edge1 += (mode->hdisplay + hbp + 20) * Bpp / device->lanes;
+
+	if (edge1 > line_num)
+		return line_num;
+
+	return edge1;
+}
+
 static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 				  struct drm_display_mode *mode)
 {
 	struct mipi_dsi_device *device = dsi->device;
 	u32 val = 0;
 
-	if ((mode->hsync_start - mode->hdisplay) > 20) {
+	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+		u16 line_num = sun6i_dsi_get_line_num(dsi, mode);
+		u16 edge0, edge1;
+
+		edge1 = sun6i_dsi_get_drq_edge1(dsi, mode, line_num);
+		edge0 = sun6i_dsi_get_drq_edge0(dsi, mode, line_num, edge1);
+
+		regmap_write(dsi->regs, SUN6I_DSI_BURST_DRQ_REG,
+			     SUN6I_DSI_BURST_DRQ_EDGE0(edge0) |
+			     SUN6I_DSI_BURST_DRQ_EDGE1(edge1));
+
+		regmap_write(dsi->regs, SUN6I_DSI_BURST_LINE_REG,
+			     SUN6I_DSI_BURST_LINE_NUM(line_num) |
+			     SUN6I_DSI_BURST_LINE_SYNC_POINT(SUN6I_DSI_SYNC_POINT));
+
+		val = SUN6I_DSI_TCON_DRQ_ENABLE_MODE;
+	} else if ((mode->hsync_start - mode->hdisplay) > 20) {
 		/* Maaaaaagic */
 		u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
 
@@ -389,8 +452,19 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
 				      struct drm_display_mode *mode)
 {
+	struct mipi_dsi_device *device = dsi->device;
 	u16 delay = 50 - 1;
 
+	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+		delay = (mode->htotal - mode->hdisplay) * 150;
+		delay /= (mode->clock / 1000) * 8;
+		delay -= 50;
+	}
+
+	regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_SEL_REG,
+			 2 << (4 * DSI_INST_ID_LP11) |
+			 3 << (4 * DSI_INST_ID_DLY));
+
 	regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
 		     SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
 		     SUN6I_DSI_INST_LOOP_NUM_N1(delay));
@@ -457,52 +531,71 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	struct mipi_dsi_device *device = dsi->device;
 	unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
 	u16 hbp, hfp, hsa, hblk, vblk;
+	u32 basic_ctl = 0;
 	size_t bytes;
 	u8 *buffer;
 
 	/* Do all timing calculations up front to allocate buffer space */
 
-	/*
-	 * A sync period is composed of a blanking packet (4 bytes +
-	 * payload + 2 bytes) and a sync event packet (4 bytes). Its
-	 * minimal size is therefore 10 bytes
-	 */
+	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+		hsa = 0;
+		hbp = 0;
+		hfp = 0;
+		hblk = mode->hdisplay * Bpp;
+		vblk = 0;
+		basic_ctl = SUN6I_DSI_BASIC_CTL_VIDEO_BURST |
+			    SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS |
+			    SUN6I_DSI_BASIC_CTL_HBP_DIS;
+
+		if (device->lanes == 4)
+			basic_ctl |= SUN6I_DSI_BASIC_CTL_TRAIL_FILL |
+				     SUN6I_DSI_BASIC_CTL_TRAIL_INV(0xc);
+	} else {
+		/*
+		 * A sync period is composed of a blanking packet (4
+		 * bytes + payload + 2 bytes) and a sync event packet
+		 * (4 bytes). Its minimal size is therefore 10 bytes
+		 */
 #define HSA_PACKET_OVERHEAD	10
-	hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
-		  (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
-
-	/*
-	 * The backporch is set using a blanking packet (4 bytes +
-	 * payload + 2 bytes). Its minimal size is therefore 6 bytes
-	 */
+		hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
+			  (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
+
+		/*
+		 * The backporch is set using a blanking packet (4
+		 * bytes + payload + 2 bytes). Its minimal size is
+		 * therefore 6 bytes
+		 */
 #define HBP_PACKET_OVERHEAD	6
-	hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
-		  (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
-
-	/*
-	 * The frontporch is set using a blanking packet (4 bytes +
-	 * payload + 2 bytes). Its minimal size is therefore 6 bytes
-	 */
+		hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
+			  (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
+
+		/*
+		 * The frontporch is set using a blanking packet (4
+		 * bytes + payload + 2 bytes). Its minimal size is
+		 * therefore 6 bytes
+		 */
 #define HFP_PACKET_OVERHEAD	6
-	hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-		  (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
-
-	/*
-	 * The blanking is set using a sync event (4 bytes) and a
-	 * blanking packet (4 bytes + payload + 2 bytes). Its minimal
-	 * size is therefore 10 bytes.
-	 */
+		hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
+			  (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
+
+		/*
+		 * The blanking is set using a sync event (4 bytes)
+		 * and a blanking packet (4 bytes + payload + 2
+		 * bytes). Its minimal size is therefore 10 bytes.
+		 */
 #define HBLK_PACKET_OVERHEAD	10
-	hblk = max((unsigned int)HBLK_PACKET_OVERHEAD,
-		   (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp - HBLK_PACKET_OVERHEAD);
-
-	/*
-	 * And I'm not entirely sure what vblk is about. The driver in
-	 * Allwinner BSP is using a rather convoluted calculation
-	 * there only for 4 lanes. However, using 0 (the !4 lanes
-	 * case) even with a 4 lanes screen seems to work...
-	 */
-	vblk = 0;
+		hblk = max((unsigned int)HBLK_PACKET_OVERHEAD,
+			   (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp -
+			   HBLK_PACKET_OVERHEAD);
+
+		/*
+		 * And I'm not entirely sure what vblk is about. The driver in
+		 * Allwinner BSP is using a rather convoluted calculation
+		 * there only for 4 lanes. However, using 0 (the !4 lanes
+		 * case) even with a 4 lanes screen seems to work...
+		 */
+		vblk = 0;
+	}
 
 	/* How many bytes do we need to send all payloads? */
 	bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
@@ -510,7 +603,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	if (WARN_ON(!buffer))
 		return;
 
-	regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, 0);
+	regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, basic_ctl);
 
 	regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
 		     sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,