[PATCH v2 12/15] drm: sprd: always initialize DPU and DSI registers

[Otto Pflüger]

When the Unisoc DRM driver is initialized for the first time to display
an image on the screen, reinitialize the display properly instead of
relying on the bootloader.

Signed-off-by: Otto Pflüger <otto.pflueger at abscue.de>
---
 drivers/gpu/drm/sprd/sprd_dpu.c | 8 ++++++++
 drivers/gpu/drm/sprd/sprd_dsi.c | 1 -
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
index 978d4947e1bc5cd5b13b1f25719268fa08b77297..b946d015133db44d2d3d0b18803ed887b2b7ae2e 100644
--- a/drivers/gpu/drm/sprd/sprd_dpu.c
+++ b/drivers/gpu/drm/sprd/sprd_dpu.c
@@ -456,6 +456,14 @@ static void sprd_dpu_init(struct sprd_dpu *dpu)
 	}
 
 	writel(int_mask, ctx->base + REG_DPU_INT_EN);
+
+	/*
+	 * The DPU is usually enabled by the bootloader to show
+	 * a splash screen. Stop it here when the kernel initializes
+	 * the display.
+	 */
+	if (!ctx->stopped)
+		sprd_dpu_stop(dpu);
 }
 
 static void sprd_dpu_fini(struct sprd_dpu *dpu)
diff --git a/drivers/gpu/drm/sprd/sprd_dsi.c b/drivers/gpu/drm/sprd/sprd_dsi.c
index 2af4273a6c73185084290c9d14b8ac18914d514b..7186d11bbdc753f52aba18995f4863b572f4fecb 100644
--- a/drivers/gpu/drm/sprd/sprd_dsi.c
+++ b/drivers/gpu/drm/sprd/sprd_dsi.c
@@ -954,7 +954,6 @@ static int sprd_dsi_context_init(struct sprd_dsi *dsi,
 	ctx->max_rd_time = 6000;
 	ctx->int0_mask = 0xffffffff;
 	ctx->int1_mask = 0xffffffff;
-	ctx->enabled = true;
 
 	return 0;
 }

-- 
2.50.0