linux-kernel - [PATCH 3/9] drm/msm/mdp4: add lcdc-align-lsb flag to control lane alignment

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Message-Id: <20181114222418.15960-3-jonathan@marek.ca>
Date:   Wed, 14 Nov 2018 17:24:10 -0500
From:   Jonathan Marek <jonathan@...ek.ca>
To:     freedreno@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...il.com>, David Airlie <airlied@...ux.ie>,
        Sean Paul <seanpaul@...omium.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Thierry Reding <treding@...dia.com>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 3/9] drm/msm/mdp4: add lcdc-align-lsb flag to control lane alignment

Controls which of the 8 lanes are used for 6 bit color.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 .../gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
index e19ab2ab63f7..7d8d11c8150a 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
@@ -377,20 +377,26 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
 	unsigned long pc = mdp4_lcdc_encoder->pixclock;
 	struct mdp4_kms *mdp4_kms = get_kms(encoder);
 	struct drm_panel *panel;
+	uint32_t config;
 	int i, ret;
 
 	if (WARN_ON(mdp4_lcdc_encoder->enabled))
 		return;
 
 	/* TODO: hard-coded for 18bpp: */
-	mdp4_crtc_set_config(encoder->crtc,
-			MDP4_DMA_CONFIG_R_BPC(BPC6) |
-			MDP4_DMA_CONFIG_G_BPC(BPC6) |
-			MDP4_DMA_CONFIG_B_BPC(BPC6) |
-			MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
-			MDP4_DMA_CONFIG_PACK(0x21) |
-			MDP4_DMA_CONFIG_DEFLKR_EN |
-			MDP4_DMA_CONFIG_DITHER_EN);
+	config =
+		MDP4_DMA_CONFIG_R_BPC(BPC6) |
+		MDP4_DMA_CONFIG_G_BPC(BPC6) |
+		MDP4_DMA_CONFIG_B_BPC(BPC6) |
+		MDP4_DMA_CONFIG_PACK(0x21) |
+		MDP4_DMA_CONFIG_DEFLKR_EN |
+		MDP4_DMA_CONFIG_DITHER_EN;
+
+	if (!of_find_property(dev->dev->of_node, "lcdc-align-lsb", NULL))
+		config |= MDP4_DMA_CONFIG_PACK_ALIGN_MSB;
+
+
+	mdp4_crtc_set_config(encoder->crtc, config);
 	mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 0);
 
 	bs_set(mdp4_lcdc_encoder, 1);
-- 
2.17.1