linux-kernel - [PATCH v7 09/23] drm/sun4i: sun6i_mipi_dsi: Enable HBP, HSA

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Message-Id: <20190201154232.10505-10-jagan@amarulasolutions.com>
Date:   Fri,  1 Feb 2019 21:12:18 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com, linux-sunxi@...glegroups.com,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: [PATCH v7 09/23] drm/sun4i: sun6i_mipi_dsi: Enable HBP, HSA_HSE for burst mode

Horizontal back porch, sync active and sync end bits are
needed to disable for burst mode panel operations.

So, disable them via dsi base control register.

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@...zup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index a2ad9fa7f8d5..3d7c03161954 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -549,12 +549,17 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	u16 hbp, hfp, hsa, hblk, vblk;
 	size_t bytes;
 	u8 *buffer;
+	u32 val = 0;
 
 	/* Do all timing calculations up front to allocate buffer space */
 
 	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
 		hbp = hfp = hsa = vblk = 0;
 		hblk = (mode->hdisplay * Bpp);
+
+		regmap_read(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, &val);
+		val |= SUN6I_DSI_BASIC_CTL_HBP_DIS;
+		val |= SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS;
 		goto alloc_buf;
 	}
 
@@ -603,7 +608,7 @@ 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, val);
 
 	regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
 		     sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,
-- 
2.18.0.321.gffc6fa0e3