[RFC 12/21] drm/udl: Remove FB_KMS_HELPER and FB related config options

[Archit Taneja <architt@codeaurora.org>]

Remove FB_* config options since the driver doesn't call any fbdev
functions directly.

Remove FB_KMS_HELPER as this would now be selected by the top level
FBDEV_EMULATION config option. If the fbdev emulation isn't selected,
the drm_fb_helper functions will be stubbed out.

The code relying on DEFERRED_IO can't be stubbed out using drm_fb_helper
functions. This is because the deferred io members in fbdev core structs
are defined based on whether FB_DEFERRED_IO is defined or not.

For now, wrap around deferred io code with an #ifdef check for
CONFIG_DEFERRED_IO. We could consider creating stub fb helper functions
here, but this would require some changes in the core fbdev structs.

Cc: David Airlie <airlied@linux.ie>
Cc: Haixia Shi <hshi@chromium.org>
Cc: "Stéphane Marchesin" <marcheu@chromium.org>

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/udl/Kconfig  |  5 -----
 drivers/gpu/drm/udl/udl_fb.c | 10 ++++++++++
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/udl/Kconfig b/drivers/gpu/drm/udl/Kconfig
index 613ab06..1616ec4 100644
--- a/drivers/gpu/drm/udl/Kconfig
+++ b/drivers/gpu/drm/udl/Kconfig
@@ -4,12 +4,7 @@ config DRM_UDL
 	depends on USB_SUPPORT
 	depends on USB_ARCH_HAS_HCD
 	select USB
-	select FB_SYS_FILLRECT
-	select FB_SYS_COPYAREA
-	select FB_SYS_IMAGEBLIT
-	select FB_DEFERRED_IO
 	select DRM_KMS_HELPER
-        select DRM_KMS_FB_HELPER
 	help
 	  This is a KMS driver for the USB displaylink video adapters.
           Say M/Y to add support for these devices via drm/kms interfaces.
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 9fd6e83..4aa5118d 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -24,11 +24,15 @@
 
 #define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */
 
+#ifdef CONFIG_FB_DEFERRED_IO
 static int fb_defio = 0;  /* Optionally enable experimental fb_defio mmap support */
+#endif
 static int fb_bpp = 16;
 
 module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
+#ifdef CONFIG_FB_DEFERRED_IO
 module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
+#endif
 
 struct udl_fbdev {
 	struct drm_fb_helper helper;
@@ -78,6 +82,7 @@ static uint16_t rgb16(uint32_t col)
 }
 #endif
 
+#ifdef CONFIG_FB_DEFERRED_IO
 /*
  * NOTE: fb_defio.c is holding info->fbdefio.mutex
  *   Touching ANY framebuffer memory that triggers a page fault
@@ -139,6 +144,7 @@ error:
 		    >> 10)), /* Kcycles */
 		   &udl->cpu_kcycles_used);
 }
+#endif
 
 int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
 		      int width, int height)
@@ -331,6 +337,7 @@ static int udl_fb_open(struct fb_info *info, int user)
 
 	ufbdev->fb_count++;
 
+#ifdef CONFIG_FB_DEFERRED_IO
 	if (fb_defio && (info->fbdefio == NULL)) {
 		/* enable defio at last moment if not disabled by client */
 
@@ -346,6 +353,7 @@ static int udl_fb_open(struct fb_info *info, int user)
 		info->fbdefio = fbdefio;
 		fb_deferred_io_init(info);
 	}
+#endif
 
 	pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 		  info->node, user, info, ufbdev->fb_count);
@@ -363,12 +371,14 @@ static int udl_fb_release(struct fb_info *info, int user)
 
 	ufbdev->fb_count--;
 
+#ifdef CONFIG_FB_DEFERRED_IO
 	if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 		fb_deferred_io_cleanup(info);
 		kfree(info->fbdefio);
 		info->fbdefio = NULL;
 		info->fbops->fb_mmap = udl_fb_mmap;
 	}
+#endif
 
 	pr_warn("released /dev/fb%d user=%d count=%d\n",
 		info->node, user, ufbdev->fb_count);
-- 
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