linux-kernel - [PATCH 2/3] drm/gma500: Print the start address of the GTT

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Date:   Wed, 30 Aug 2023 23:45:45 +0800
From:   Sui Jingfeng <suijingfeng@...ngson.cn>
To:     Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] drm/gma500: Print the start address of the GTT

The PGTBL_CTL register provides the starting physical memory address of
the Graphics Translation Table (GTT). We want to see what's the value in
it. This patch is useful for debug.

Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
---
 drivers/gpu/drm/gma500/gtt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/gma500/gtt.c b/drivers/gpu/drm/gma500/gtt.c
index 379bc218aa6b..112418301866 100644
--- a/drivers/gpu/drm/gma500/gtt.c
+++ b/drivers/gpu/drm/gma500/gtt.c
@@ -243,6 +243,8 @@ static void psb_gtt_init_ranges(struct drm_psb_private *dev_priv)
 		gtt_mem = &pdev->resource[PSB_GATT_RESOURCE];
 	}
 
+	drm_info(dev, "Phys start of GTT: 0x%llx\n", (u64)gtt_phys_start);
+
 	pg->gtt_phys_start = gtt_phys_start;
 	pg->mmu_gatt_start = mmu_gatt_start;
 	pg->gtt_start = gtt_start;
-- 
2.34.1