linux-kernel - [PATCH v3] drm/radeon: Call radeon_suspend_kms() in radeon_pci

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Message-Id: <1623210910-20057-1-git-send-email-yangtiezhu@loongson.cn>
Date:   Wed,  9 Jun 2021 11:55:10 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Alex Deucher <alexander.deucher@....com>, christian.koenig@....com,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Jianmin Lv <lvjianmin@...ngson.cn>
Subject: [PATCH v3] drm/radeon: Call radeon_suspend_kms() in radeon_pci_shutdown() for Loongson64

On the Loongson64 platform used with Radeon GPU, shutdown or reboot failed
when console=tty is in the boot cmdline.

radeon_suspend_kms() puts the hw in the suspend state, especially set fb
state as FBINFO_STATE_SUSPENDED:

	if (fbcon) {
		console_lock();
		radeon_fbdev_set_suspend(rdev, 1);
		console_unlock();
	}

Then avoid to do any more fb operations in the related functions:

	if (p->state != FBINFO_STATE_RUNNING)
		return;

So call radeon_suspend_kms() in radeon_pci_shutdown() for Loongson64 to fix
this issue, it looks like some kind of workaround like powerpc.

Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---

v3: Fix typo "becauase" in the original comment

 drivers/gpu/drm/radeon/radeon_drv.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index efeb115..40aece3 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -386,13 +386,13 @@ radeon_pci_shutdown(struct pci_dev *pdev)
 	if (radeon_device_is_virtual())
 		radeon_pci_remove(pdev);
 
-#ifdef CONFIG_PPC64
+#if defined(CONFIG_PPC64) || defined(CONFIG_MACH_LOONGSON64)
 	/*
 	 * Some adapters need to be suspended before a
 	 * shutdown occurs in order to prevent an error
-	 * during kexec.
-	 * Make this power specific becauase it breaks
-	 * some non-power boards.
+	 * during kexec, shutdown or reboot.
+	 * Make this power and Loongson specific because
+	 * it breaks some other boards.
 	 */
 	radeon_suspend_kms(pci_get_drvdata(pdev), true, true, false);
 #endif
-- 
2.1.0