[PATCH 3/8] fbdev: Add Kconfig macro FB_IOMEM_HELPERS_DEFERRED

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The new Kconfig macro FB_IOMEM_HELPERS_DEFERRED selects fbdev's
helpers for device I/O memory and deferred I/O. Drivers should
use it if they perform damage updates on device I/O memory.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/video/fbdev/core/Kconfig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/video/fbdev/core/Kconfig b/drivers/video/fbdev/core/Kconfig
index baf7e852c75b..e80d6429f76a 100644
--- a/drivers/video/fbdev/core/Kconfig
+++ b/drivers/video/fbdev/core/Kconfig
@@ -151,6 +151,12 @@ config FB_IOMEM_HELPERS
 	select FB_CFB_FILLRECT
 	select FB_CFB_IMAGEBLIT
 
+config FB_IOMEM_HELPERS_DEFERRED
+	bool
+	depends on FB_CORE
+	select FB_DEFERRED_IO
+	select FB_IOMEM_HELPERS
+
 config FB_SYSMEM_HELPERS
 	bool
 	depends on FB_CORE
-- 
2.41.0




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