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From: Jagan Teki <jagan@amarulasolutions.com>
To: Maxime Ripard <maxime.ripard@free-electrons.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
Cc: Jagan Teki <jagan@amarulasolutions.com>
Subject: [PATCH v2 08/15] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits
Date: Tue, 23 Oct 2018 21:20:28 +0530	[thread overview]
Message-ID: <20181023155035.9101-9-jagan@amarulasolutions.com> (raw)
In-Reply-To: <20181023155035.9101-1-jagan@amarulasolutions.com>

TCON DRQ set bits for non-burst DSI mode can computed via
horizontal front porch instead of front porch + sync timings.

According to BSP code form BPI-M64-bsp in
linux-sunxi/drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c
TCON DRQ set bits are computed for non-burst mode as

=> panel->lcd_ht -    panel->lcd_x - panel->lcd_hbp
=> (timmings->hor_front_porch + panel->lcd_hbp + panel->lcd_x)
   - panel->lcd_x - panel->hbp
=> timmings->hor_front_porch
=> mode->hsync_start - mode->hdisplay

So, update the DRQ set bits accordingly.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v2:
- Add detailed commit message

 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 3a1d48bc1996..8d154cf2e6d6 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -367,9 +367,9 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 	struct mipi_dsi_device *device = dsi->device;
 	u32 val = 0;
 
-	if ((mode->hsync_end - mode->hdisplay) > 20) {
+	if ((mode->hsync_start - mode->hdisplay) > 20) {
 		/* Maaaaaagic */
-		u16 drq = (mode->hsync_end - mode->hdisplay) - 20;
+		u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
 
 		drq *= mipi_dsi_pixel_format_to_bpp(device->format);
 		drq /= 32;
-- 
2.18.0.321.gffc6fa0e3


  parent reply	other threads:[~2018-10-23 15:51 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-23 15:50 [PATCH v2 00/15] drm/sun4i: Allwinner A64 MIPI-DSI support Jagan Teki
2018-10-23 15:50 ` [PATCH v2 01/15] clk: sunxi-ng: a64: Fix gate bit of DSI DPHY Jagan Teki
2018-10-24  8:48   ` Stephen Boyd
2018-10-23 15:50 ` [PATCH v2 02/15] clk: sunxi-ng: Add check for minimal rate to NKM PLLs Jagan Teki
2018-10-24  8:48   ` Stephen Boyd
2018-10-24 18:04   ` Maxime Ripard
2018-10-25 10:55     ` Jagan Teki
2018-10-29  8:58       ` Maxime Ripard
2018-10-29 12:40         ` [linux-sunxi] " Jagan Teki
2018-11-05 10:11           ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 03/15] clk: sunxi-ng: Add check for maximum " Jagan Teki
2018-10-23 17:10   ` Vasily Khoruzhick
2018-10-24  8:48   ` Stephen Boyd
2018-10-23 15:50 ` [PATCH v2 04/15] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support Jagan Teki
2018-10-24 18:06   ` Maxime Ripard
2018-10-25 11:02     ` Jagan Teki
2018-10-29  9:00       ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 05/15] dt-bindings: sun6i-dsi: Add compatible for A64 MIPI DSI Jagan Teki
2018-10-23 15:50 ` [PATCH v2 06/15] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2018-10-23 15:50 ` [PATCH v2 07/15] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2018-10-23 15:50 ` Jagan Teki [this message]
2018-10-23 15:50 ` [PATCH v2 09/15] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2018-10-23 15:50 ` [PATCH v2 10/15] dt-bindings: panel: Add Bananapi S070WV20-CT16 ICN6211 MIPI-DSI to RGB bridge Jagan Teki
2018-10-24 18:07   ` Maxime Ripard
2018-10-24 20:36     ` Chen-Yu Tsai
2018-10-23 15:50 ` [PATCH v2 11/15] drm/panel: " Jagan Teki
2018-10-23 15:50 ` [PATCH v2 12/15] clk: sunxi-ng: a64: Add min and max rate for PLL_MIPI Jagan Teki
2018-10-24  8:49   ` Stephen Boyd
2018-10-24 18:13   ` Maxime Ripard
2018-10-25 15:51     ` Jagan Teki
2018-10-29  9:08       ` Maxime Ripard
2018-10-29 15:08         ` Jagan Teki
2018-11-05 12:42           ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 13/15] dt-bindings: sun6i-dsi: Add compatible for A64 DPHY Jagan Teki
2018-10-24 18:09   ` Maxime Ripard
2018-10-25 12:52     ` Jagan Teki
2018-10-29  9:01       ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 14/15] arm64: dts: allwinner: a64: Add DSI pipeline Jagan Teki
2018-10-24 18:10   ` Maxime Ripard
2018-10-25 13:21     ` Jagan Teki
2018-10-29  9:01       ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 15/15] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel Jagan Teki
2018-10-24 18:11   ` Maxime Ripard
2018-10-24 20:36     ` Chen-Yu Tsai

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