From ad97f6cc4d4bf39f439a62228d73758a2a23abd7 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tue, 25 Jan 2022 10:12:20 +0100
Subject: drm/simpledrm: Request memory region in driver
Git-commit: 8ec6a72da65bbc4d341253e5a641a51bb1c0d967
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

Requesting the framebuffer memory in simpledrm marks the memory
range as busy. This used to be done by the firmware sysfb code,
but the driver is the correct place.

v2:
	* use I/O memory if request_mem_region() fails (Jocelyn)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220125091222.21457-4-tzimmermann@suse.de
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/tiny/simpledrm.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 04146da2d1d8..d191e87a37b5 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -526,21 +526,33 @@ static int simpledrm_device_init_mm(struct simpledrm_device *sdev)
 {
 	struct drm_device *dev = &sdev->dev;
 	struct platform_device *pdev = sdev->pdev;
-	struct resource *mem;
+	struct resource *res, *mem;
 	void __iomem *screen_base;
 	int ret;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem)
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
 		return -EINVAL;
 
-	ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
+	ret = devm_aperture_acquire_from_firmware(dev, res->start, resource_size(res));
 	if (ret) {
 		drm_err(dev, "could not acquire memory range %pr: error %d\n",
-			mem, ret);
+			res, ret);
 		return ret;
 	}
 
+	mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
+				      sdev->dev.driver->name);
+	if (!mem) {
+		/*
+		 * We cannot make this fatal. Sometimes this comes from magic
+		 * spaces our resource handlers simply don't know about. Use
+		 * the I/O-memory resource as-is and try to map that instead.
+		 */
+		drm_warn(dev, "could not acquire memory region %pr\n", res);
+		mem = res;
+	}
+
 	screen_base = devm_ioremap_wc(&pdev->dev, mem->start,
 				      resource_size(mem));
 	if (!screen_base)
-- 
2.38.1