[PATCH v2] drm/ast: use managed devres functions

[Philipp Stanner <pstanner@redhat.com>]

Currently, tha ast-driver just maps the PCI-dev's regions with
pcim_iomap(). It does not actually reserve the regions exclusively
with, e.g., pci_request_regions().

Replace the calls to pcim_iomap() with ones to pcim_iomap_regions() to
reserve and map the regions simultaneously.

Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
Changes in v2:
- Remove unnecessary return code checks for pcim_iomap_regions()
  (Jocelyn)

Thx Jocelyn for the kind review
---
 drivers/gpu/drm/ast/ast_main.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index dae365ed3969..8b714b99f9d6 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -444,9 +444,11 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 	if (ret)
 		return ERR_PTR(ret);
 
-	ast->regs = pcim_iomap(pdev, 1, 0);
-	if (!ast->regs)
-		return ERR_PTR(-EIO);
+	ret = pcim_iomap_regions(pdev, BIT(1), 0);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ast->regs = pcim_iomap_table(pdev)[1];
 
 	/*
 	 * After AST2500, MMIO is enabled by default, and it should be adopted
@@ -461,9 +463,10 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 
 	/* "map" IO regs if the above hasn't done so already */
 	if (!ast->ioregs) {
-		ast->ioregs = pcim_iomap(pdev, 2, 0);
-		if (!ast->ioregs)
-			return ERR_PTR(-EIO);
+		ret = pcim_iomap_regions(pdev, BIT(2), 0);
+		if (ret)
+			return ERR_PTR(ret);
+		ast->ioregs = pcim_iomap_table(pdev)[2];
 	}
 
 	if (!ast_is_vga_enabled(dev)) {
-- 
2.41.0