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From: Jagan Teki <jagan@amarulasolutions.com>
To: Maxime Ripard <maxime.ripard@bootlin.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Chen-Yu Tsai <wens@csie.org>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Jagan Teki <jagan@amarulasolutions.com>,
	Michael Trimarchi <michael@amarulasolutions.com>,
	linux-amarula@amarulasolutions.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 2/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value
Date: Fri, 15 Feb 2019 00:55:38 +0530	[thread overview]
Message-ID: <20190214192544.7314-3-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

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 hbp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane DSI LCD panels.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index d70a8c43a4b8..982ae6b17654 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -472,7 +472,7 @@ 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 +
-- 
2.18.0.321.gffc6fa0e3


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Jagan Teki <jagan@amarulasolutions.com>
To: Maxime Ripard <maxime.ripard@bootlin.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Chen-Yu Tsai <wens@csie.org>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Jagan Teki <jagan@amarulasolutions.com>,
	Michael Trimarchi <michael@amarulasolutions.com>,
	linux-amarula@amarulasolutions.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 2/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value
Date: Fri, 15 Feb 2019 00:55:38 +0530	[thread overview]
Message-ID: <20190214192544.7314-3-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

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 hbp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane DSI LCD panels.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index d70a8c43a4b8..982ae6b17654 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -472,7 +472,7 @@ 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 +
-- 
2.18.0.321.gffc6fa0e3

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

WARNING: multiple messages have this Message-ID (diff)
From: Jagan Teki <jagan@amarulasolutions.com>
To: Maxime Ripard <maxime.ripard@bootlin.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Chen-Yu Tsai <wens@csie.org>
Cc: dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-amarula@amarulasolutions.com,
	Michael Trimarchi <michael@amarulasolutions.com>,
	Jagan Teki <jagan@amarulasolutions.com>
Subject: [PATCH v8 2/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value
Date: Fri, 15 Feb 2019 00:55:38 +0530	[thread overview]
Message-ID: <20190214192544.7314-3-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

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 hbp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane DSI LCD panels.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index d70a8c43a4b8..982ae6b17654 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -472,7 +472,7 @@ 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 +
-- 
2.18.0.321.gffc6fa0e3


  parent reply	other threads:[~2019-02-14 19:26 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14 19:25 [PATCH v8 0/8] drm/sun4i: sun6i_mipi_dsi: Random fixes Jagan Teki
2019-02-14 19:25 ` Jagan Teki
2019-02-14 19:25 ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 1/8] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` Jagan Teki [this message]
2019-02-14 19:25   ` [PATCH v8 2/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp " Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 4/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hblk timing calculation Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 5/8] drm/sun4i: sun6i_mipi_dsi: Add DSI hblk packet overhead Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 6/8] drm/sun4i: sun6i_mipi_dsi: Set proper vblk timing calculation Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 7/8] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-15 19:37   ` Jagan Teki
2019-02-15 19:37     ` Jagan Teki
2019-02-14 19:25 ` [PATCH v8 8/8] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2019-02-14 19:25   ` Jagan Teki
2019-02-14 19:25   ` Jagan Teki

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