Re: [PATCH v2] drm/qxl: fix qxl can't use in arm64

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Am 24.03.22 um 11:49 schrieb Cong Liu:
qxl use ioremap to map ram_header and rom, in the arm64 implementation,
the device is mapped as DEVICE_nGnRE, it can not support unaligned
access. and qxl is a virtual device, it can be treated more like RAM
than actual MMIO registers. use ioremap_wc() replace it.

Signed-off-by: Cong Liu <liucong2@xxxxxxxxxx>

Looks sane to me, but I'm really not involved enough to fully judge.

Acked-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/qxl/qxl_kms.c | 4 ++--
  drivers/gpu/drm/qxl/qxl_ttm.c | 4 ++--
  2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 4dc5ad13f12c..a054e4a00fe8 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -165,7 +165,7 @@ int qxl_device_init(struct qxl_device *qdev,
  		 (int)qdev->surfaceram_size / 1024,
  		 (sb == 4) ? "64bit" : "32bit");
- qdev->rom = ioremap(qdev->rom_base, qdev->rom_size);
+	qdev->rom = ioremap_wc(qdev->rom_base, qdev->rom_size);
  	if (!qdev->rom) {
  		pr_err("Unable to ioremap ROM\n");
  		r = -ENOMEM;
@@ -183,7 +183,7 @@ int qxl_device_init(struct qxl_device *qdev,
  		goto rom_unmap;
  	}
- qdev->ram_header = ioremap(qdev->vram_base +
+	qdev->ram_header = ioremap_wc(qdev->vram_base +
  				   qdev->rom->ram_header_offset,
  				   sizeof(*qdev->ram_header));
  	if (!qdev->ram_header) {
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index b2e33d5ba5d0..95df5750f47f 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -82,13 +82,13 @@ int qxl_ttm_io_mem_reserve(struct ttm_device *bdev,
  	case TTM_PL_VRAM:
  		mem->bus.is_iomem = true;
  		mem->bus.offset = (mem->start << PAGE_SHIFT) + qdev->vram_base;
-		mem->bus.caching = ttm_cached;
+		mem->bus.caching = ttm_write_combined;
  		break;
  	case TTM_PL_PRIV:
  		mem->bus.is_iomem = true;
  		mem->bus.offset = (mem->start << PAGE_SHIFT) +
  			qdev->surfaceram_base;
-		mem->bus.caching = ttm_cached;
+		mem->bus.caching = ttm_write_combined;
  		break;
  	default:
  		return -EINVAL;

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