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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 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value
Date: Fri, 15 Feb 2019 00:55:39 +0530	[thread overview]
Message-ID: <20190214192544.7314-4-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

Current driver is calculating hfp maximum value by subtracting
htotal with hsync_end which is back porch value, but the hfp
refers to front porch.

Front porch value is calculating by subtracting hsync_start with
hdisplay as per drm_mode timings, and BSP code from BPI-M64-bsp
is eventually following the same.

BPI-M64-bsp is computing hfp as (from linux-sunxi/
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2);
dsi_hact = x * dsi_pixel_bits[format]/8;
dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2);
dsi_hfp = dsi_hblk - (4+dsi_hact+2) - (4+dsi_hbp+2);

Example,
u32 fmt = dsi_pixel_bits[format]/8;
=> ((ht-hspw)*fmt - 10) - (6 + x * fmt) - (6 + (hbp-hspw)*fmt - 6)
=> (ht - hspw - x - (hbp - hspw)) * fmt - 16
=> (ht - x - hbp) * fmt - 16
=> (ht - x - (timmings->hor_total_time - timmings->hor_front_porch - x)
* fmt - 16
=> (timmings->hor_total_time - x - timmings->hor_total_time +
timmings->hor_front_porch + x) * fmt - 16
=> timmings->hor_front_porch * fmt - 16

So, update the hfp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane MIPI-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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 982ae6b17654..21f39f11a8de 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -480,7 +480,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	 */
 #define HFP_PACKET_OVERHEAD	6
 	hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-		  (mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
+		  (mode->hsync_start - mode->hdisplay) * Bpp -
+		  HFP_PACKET_OVERHEAD);
 
 	/*
 	 * hblk seems to be the line + porches length.
-- 
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 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value
Date: Fri, 15 Feb 2019 00:55:39 +0530	[thread overview]
Message-ID: <20190214192544.7314-4-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

Current driver is calculating hfp maximum value by subtracting
htotal with hsync_end which is back porch value, but the hfp
refers to front porch.

Front porch value is calculating by subtracting hsync_start with
hdisplay as per drm_mode timings, and BSP code from BPI-M64-bsp
is eventually following the same.

BPI-M64-bsp is computing hfp as (from linux-sunxi/
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2);
dsi_hact = x * dsi_pixel_bits[format]/8;
dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2);
dsi_hfp = dsi_hblk - (4+dsi_hact+2) - (4+dsi_hbp+2);

Example,
u32 fmt = dsi_pixel_bits[format]/8;
=> ((ht-hspw)*fmt - 10) - (6 + x * fmt) - (6 + (hbp-hspw)*fmt - 6)
=> (ht - hspw - x - (hbp - hspw)) * fmt - 16
=> (ht - x - hbp) * fmt - 16
=> (ht - x - (timmings->hor_total_time - timmings->hor_front_porch - x)
* fmt - 16
=> (timmings->hor_total_time - x - timmings->hor_total_time +
timmings->hor_front_porch + x) * fmt - 16
=> timmings->hor_front_porch * fmt - 16

So, update the hfp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane MIPI-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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 982ae6b17654..21f39f11a8de 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -480,7 +480,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	 */
 #define HFP_PACKET_OVERHEAD	6
 	hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-		  (mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
+		  (mode->hsync_start - mode->hdisplay) * Bpp -
+		  HFP_PACKET_OVERHEAD);
 
 	/*
 	 * hblk seems to be the line + porches length.
-- 
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 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value
Date: Fri, 15 Feb 2019 00:55:39 +0530	[thread overview]
Message-ID: <20190214192544.7314-4-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com>

Current driver is calculating hfp maximum value by subtracting
htotal with hsync_end which is back porch value, but the hfp
refers to front porch.

Front porch value is calculating by subtracting hsync_start with
hdisplay as per drm_mode timings, and BSP code from BPI-M64-bsp
is eventually following the same.

BPI-M64-bsp is computing hfp as (from linux-sunxi/
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2);
dsi_hact = x * dsi_pixel_bits[format]/8;
dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2);
dsi_hfp = dsi_hblk - (4+dsi_hact+2) - (4+dsi_hbp+2);

Example,
u32 fmt = dsi_pixel_bits[format]/8;
=> ((ht-hspw)*fmt - 10) - (6 + x * fmt) - (6 + (hbp-hspw)*fmt - 6)
=> (ht - hspw - x - (hbp - hspw)) * fmt - 16
=> (ht - x - hbp) * fmt - 16
=> (ht - x - (timmings->hor_total_time - timmings->hor_front_porch - x)
* fmt - 16
=> (timmings->hor_total_time - x - timmings->hor_total_time +
timmings->hor_front_porch + x) * fmt - 16
=> timmings->hor_front_porch * fmt - 16

So, update the hfp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane MIPI-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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 982ae6b17654..21f39f11a8de 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -480,7 +480,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	 */
 #define HFP_PACKET_OVERHEAD	6
 	hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-		  (mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
+		  (mode->hsync_start - mode->hdisplay) * Bpp -
+		  HFP_PACKET_OVERHEAD);
 
 	/*
 	 * hblk seems to be the line + porches length.
-- 
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 ` [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   ` Jagan Teki
2019-02-14 19:25 ` Jagan Teki [this message]
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 ` [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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