linux-kernel - [PATCH] drm/meson: remove firmware framebuffers

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Date:   Mon, 10 Dec 2018 10:04:48 +0100
From:   Maxime Jourdan <mjourdan@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/meson: remove firmware framebuffers

In case we are using simplefb or another conflicting framebuffer, make
the call to drm_fb_helper_remove_conflicting_framebuffers()

Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
---
 drivers/gpu/drm/meson/meson_drv.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index d3443125e661..82fbd7ae80e4 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -159,6 +159,22 @@ static void meson_vpu_init(struct meson_drm *priv)
 	writel_relaxed(0x20000, priv->io_base + _REG(VPU_WRARB_MODE_L2C1));
 }
 
+static void meson_remove_framebuffers(void)
+{
+        struct apertures_struct *ap;
+
+        ap = alloc_apertures(1);
+        if (!ap)
+                return;
+
+        /* The framebuffer can be located anywhere in RAM */
+        ap->ranges[0].base = 0;
+        ap->ranges[0].size = ~0;
+
+        drm_fb_helper_remove_conflicting_framebuffers(ap, "meson-drm-fb", false);
+        kfree(ap);
+}
+
 static int meson_drv_bind_master(struct device *dev, bool has_components)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -242,6 +258,9 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (ret)
 		goto free_drm;
 
+	/* Remove early framebuffers (ie. simplefb) */
+	meson_remove_framebuffers();
+
 	drm_mode_config_init(drm);
 	drm->mode_config.max_width = 3840;
 	drm->mode_config.max_height = 2160;
-- 
2.19.2