linux-kernel - [PATCH] drm/hisilicon: Fixed pcie resource conflict between drm and firmware

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Date:   Wed, 19 Feb 2020 15:57:08 +0800
From:   Tian Tao <tiantao6@...ilicon.com>
To:     <puck.chen@...ilicon.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <tzimmermann@...e.de>, <kraxel@...hat.com>,
        <alexander.deucher@....com>, <tglx@...utronix.de>,
        <dri-devel@...ts.freedesktop.org>, <xinliang.liu@...aro.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linuxarm@...wei.com>
Subject: [PATCH] drm/hisilicon: Fixed pcie resource conflict between drm and firmware

remove the framebuffer initialized by fireware/bootloader,which will use
hibmc's pcie resource, and may cause conflict.

Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
Signed-off-by: Gong junjie <gongjunjie2@...wei.com>
---
 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index 5f612f6..7ebe831 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
@@ -47,6 +47,22 @@ static irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
 	return IRQ_HANDLED;
 }
 
+static void hibmc_remove_framebuffers(struct pci_dev *pdev)
+{
+	struct apertures_struct *ap;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return;
+
+	ap->ranges[0].base = pci_resource_start(pdev, 0);
+	ap->ranges[0].size = pci_resource_len(pdev, 0);
+
+	drm_fb_helper_remove_conflicting_framebuffers(ap, "hibmcdrmfb", false);
+
+	kfree(ap);
+}
+
 static struct drm_driver hibmc_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 	.fops			= &hibmc_fops,
@@ -327,6 +343,8 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
 	struct drm_device *dev;
 	int ret;
 
+	hibmc_remove_framebuffers(pdev);
+
 	dev = drm_dev_alloc(&hibmc_driver, &pdev->dev);
 	if (IS_ERR(dev)) {
 		DRM_ERROR("failed to allocate drm_device\n");
-- 
2.7.4