diff mbox series

[v2,06/10] drm/fb-helper: Initialize fb-helper's preferred BPP in prepare function

Message ID 20230124134010.30263-7-tzimmermann@suse.de (mailing list archive)
State New, archived
Headers show
Series drm/fb-helper: Various cleanups | expand

Commit Message

Thomas Zimmermann Jan. 24, 2023, 1:40 p.m. UTC
Initialize the fb-helper's preferred_bpp field early from within
drm_fb_helper_prepare(); instead of the later client hot-plugging
callback. This simplifies the generic fbdev setup function.

No real changes, but all drivers' fbdev code has to be adapted.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/armada/armada_fbdev.c      |  4 ++--
 drivers/gpu/drm/drm_fb_helper.c            | 22 ++++++++++++++++++----
 drivers/gpu/drm/drm_fbdev_generic.c        | 19 ++-----------------
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c  |  4 ++--
 drivers/gpu/drm/gma500/framebuffer.c       |  4 ++--
 drivers/gpu/drm/i915/display/intel_fbdev.c | 11 ++++++-----
 drivers/gpu/drm/msm/msm_fbdev.c            |  4 ++--
 drivers/gpu/drm/omapdrm/omap_fbdev.c       |  4 ++--
 drivers/gpu/drm/radeon/radeon_fb.c         |  4 ++--
 drivers/gpu/drm/tegra/fb.c                 |  7 +++----
 include/drm/drm_fb_helper.h                |  3 ++-
 11 files changed, 43 insertions(+), 43 deletions(-)

Comments

kernel test robot Jan. 25, 2023, 4:51 a.m. UTC | #1
Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on 7d3e7f64a42d66ba8da6e7b66a8d85457ef84570]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/drm-client-Test-for-connectors-before-sending-hotplug-event/20230124-214220
base:   7d3e7f64a42d66ba8da6e7b66a8d85457ef84570
patch link:    https://lore.kernel.org/r/20230124134010.30263-7-tzimmermann%40suse.de
patch subject: [Intel-gfx] [PATCH v2 06/10] drm/fb-helper: Initialize fb-helper's preferred BPP in prepare function
config: riscv-randconfig-r042-20230123 (https://download.01.org/0day-ci/archive/20230125/202301251250.eyIn4zjn-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/70e38534e74e4d12bb02b3b352bba2aed417f541
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Thomas-Zimmermann/drm-client-Test-for-connectors-before-sending-hotplug-event/20230124-214220
        git checkout 70e38534e74e4d12bb02b3b352bba2aed417f541
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/gpu/drm/radeon/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/radeon/radeon_fb.c:352:10: error: too many arguments to function call, expected 3, have 4
                                 &radeon_fb_helper_funcs);
                                 ^~~~~~~~~~~~~~~~~~~~~~~
   include/drm/drm_fb_helper.h:295:20: note: 'drm_fb_helper_prepare' declared here
   static inline void drm_fb_helper_prepare(struct drm_device *dev,
                      ^
>> drivers/gpu/drm/radeon/radeon_fb.c:361:52: error: too few arguments to function call, expected 2, have 1
           ret = drm_fb_helper_initial_config(&rfbdev->helper);
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~                ^
   include/drm/drm_fb_helper.h:459:19: note: 'drm_fb_helper_initial_config' declared here
   static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
                     ^
   2 errors generated.


vim +352 drivers/gpu/drm/radeon/radeon_fb.c

386516744ba45d Dave Airlie       2010-03-30  326  
386516744ba45d Dave Airlie       2010-03-30  327  int radeon_fbdev_init(struct radeon_device *rdev)
386516744ba45d Dave Airlie       2010-03-30  328  {
8be48d924c307e Dave Airlie       2010-03-30  329  	struct radeon_fbdev *rfbdev;
4abe35204af82a Dave Airlie       2010-03-30  330  	int bpp_sel = 32;
5a79395b2791cc Chris Wilson      2010-06-06  331  	int ret;
4abe35204af82a Dave Airlie       2010-03-30  332  
e5f243bd2edd95 Alex Deucher      2016-03-10  333  	/* don't enable fbdev if no connectors */
e5f243bd2edd95 Alex Deucher      2016-03-10  334  	if (list_empty(&rdev->ddev->mode_config.connector_list))
e5f243bd2edd95 Alex Deucher      2016-03-10  335  		return 0;
e5f243bd2edd95 Alex Deucher      2016-03-10  336  
7b8bd6bb4298ac Egbert Eich       2017-07-18  337  	/* select 8 bpp console on 8MB cards, or 16 bpp on RN50 or 32MB */
7b8bd6bb4298ac Egbert Eich       2017-07-18  338  	if (rdev->mc.real_vram_size <= (8*1024*1024))
4abe35204af82a Dave Airlie       2010-03-30  339  		bpp_sel = 8;
7b8bd6bb4298ac Egbert Eich       2017-07-18  340  	else if (ASIC_IS_RN50(rdev) ||
7b8bd6bb4298ac Egbert Eich       2017-07-18  341  		 rdev->mc.real_vram_size <= (32*1024*1024))
7b8bd6bb4298ac Egbert Eich       2017-07-18  342  		bpp_sel = 16;
8be48d924c307e Dave Airlie       2010-03-30  343  
8be48d924c307e Dave Airlie       2010-03-30  344  	rfbdev = kzalloc(sizeof(struct radeon_fbdev), GFP_KERNEL);
8be48d924c307e Dave Airlie       2010-03-30  345  	if (!rfbdev)
8be48d924c307e Dave Airlie       2010-03-30  346  		return -ENOMEM;
771fe6b912fca5 Jerome Glisse     2009-06-05  347  
8be48d924c307e Dave Airlie       2010-03-30  348  	rfbdev->rdev = rdev;
8be48d924c307e Dave Airlie       2010-03-30  349  	rdev->mode_info.rfbdev = rfbdev;
10a231026574f9 Thierry Reding    2014-06-27  350  
70e38534e74e4d Thomas Zimmermann 2023-01-24  351  	drm_fb_helper_prepare(rdev->ddev, &rfbdev->helper, bpp_sel,
10a231026574f9 Thierry Reding    2014-06-27 @352  			      &radeon_fb_helper_funcs);
785b93ef8c3097 Dave Airlie       2009-08-28  353  
2dea2d1182179e Pankaj Bharadiya  2020-03-05  354  	ret = drm_fb_helper_init(rdev->ddev, &rfbdev->helper);
01934c2a691882 Thierry Reding    2014-12-19  355  	if (ret)
01934c2a691882 Thierry Reding    2014-12-19  356  		goto free;
5a79395b2791cc Chris Wilson      2010-06-06  357  
76a39dbfb2d1bc Daniel Vetter     2013-01-20  358  	/* disable all the possible outputs/crtcs before entering KMS mode */
76a39dbfb2d1bc Daniel Vetter     2013-01-20  359  	drm_helper_disable_unused_functions(rdev->ddev);
76a39dbfb2d1bc Daniel Vetter     2013-01-20  360  
70e38534e74e4d Thomas Zimmermann 2023-01-24 @361  	ret = drm_fb_helper_initial_config(&rfbdev->helper);
01934c2a691882 Thierry Reding    2014-12-19  362  	if (ret)
01934c2a691882 Thierry Reding    2014-12-19  363  		goto fini;
01934c2a691882 Thierry Reding    2014-12-19  364  
771fe6b912fca5 Jerome Glisse     2009-06-05  365  	return 0;
01934c2a691882 Thierry Reding    2014-12-19  366  
01934c2a691882 Thierry Reding    2014-12-19  367  fini:
01934c2a691882 Thierry Reding    2014-12-19  368  	drm_fb_helper_fini(&rfbdev->helper);
01934c2a691882 Thierry Reding    2014-12-19  369  free:
01934c2a691882 Thierry Reding    2014-12-19  370  	kfree(rfbdev);
01934c2a691882 Thierry Reding    2014-12-19  371  	return ret;
386516744ba45d Dave Airlie       2010-03-30  372  }
386516744ba45d Dave Airlie       2010-03-30  373
Javier Martinez Canillas Jan. 25, 2023, 9:41 a.m. UTC | #2
On 1/24/23 14:40, Thomas Zimmermann wrote:
> Initialize the fb-helper's preferred_bpp field early from within
> drm_fb_helper_prepare(); instead of the later client hot-plugging
> callback. This simplifies the generic fbdev setup function.
> 
> No real changes, but all drivers' fbdev code has to be adapted.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
kernel test robot Jan. 25, 2023, 12:12 p.m. UTC | #3
Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on 7d3e7f64a42d66ba8da6e7b66a8d85457ef84570]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/drm-client-Test-for-connectors-before-sending-hotplug-event/20230124-214220
base:   7d3e7f64a42d66ba8da6e7b66a8d85457ef84570
patch link:    https://lore.kernel.org/r/20230124134010.30263-7-tzimmermann%40suse.de
patch subject: [Intel-gfx] [PATCH v2 06/10] drm/fb-helper: Initialize fb-helper's preferred BPP in prepare function
config: x86_64-randconfig-a014-20230123 (https://download.01.org/0day-ci/archive/20230125/202301252016.vm7ksFra-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/70e38534e74e4d12bb02b3b352bba2aed417f541
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Thomas-Zimmermann/drm-client-Test-for-connectors-before-sending-hotplug-event/20230124-214220
        git checkout 70e38534e74e4d12bb02b3b352bba2aed417f541
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/gma500/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/gma500/framebuffer.c:412:44: error: too many arguments to function call, expected 3, have 4
           drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fb_helper_funcs);
           ~~~~~~~~~~~~~~~~~~~~~                     ^~~~~~~~~~~~~~~~~~~~
   include/drm/drm_fb_helper.h:295:20: note: 'drm_fb_helper_prepare' declared here
   static inline void drm_fb_helper_prepare(struct drm_device *dev,
                      ^
>> drivers/gpu/drm/gma500/framebuffer.c:421:46: error: too few arguments to function call, expected 2, have 1
           ret = drm_fb_helper_initial_config(fb_helper);
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~          ^
   include/drm/drm_fb_helper.h:459:19: note: 'drm_fb_helper_initial_config' declared here
   static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
                     ^
   2 errors generated.


vim +412 drivers/gpu/drm/gma500/framebuffer.c

   397	
   398	int psb_fbdev_init(struct drm_device *dev)
   399	{
   400		struct drm_fb_helper *fb_helper;
   401		struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
   402		int ret;
   403	
   404		fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
   405		if (!fb_helper) {
   406			dev_err(dev->dev, "no memory\n");
   407			return -ENOMEM;
   408		}
   409	
   410		dev_priv->fb_helper = fb_helper;
   411	
 > 412		drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fb_helper_funcs);
   413	
   414		ret = drm_fb_helper_init(dev, fb_helper);
   415		if (ret)
   416			goto free;
   417	
   418		/* disable all the possible outputs/crtcs before entering KMS mode */
   419		drm_helper_disable_unused_functions(dev);
   420	
 > 421		ret = drm_fb_helper_initial_config(fb_helper);
   422		if (ret)
   423			goto fini;
   424	
   425		return 0;
   426	
   427	fini:
   428		drm_fb_helper_fini(fb_helper);
   429	free:
   430		kfree(fb_helper);
   431		return ret;
   432	}
   433
diff mbox series

Patch

diff --git a/drivers/gpu/drm/armada/armada_fbdev.c b/drivers/gpu/drm/armada/armada_fbdev.c
index 584cee123bd8..07e410c62b7a 100644
--- a/drivers/gpu/drm/armada/armada_fbdev.c
+++ b/drivers/gpu/drm/armada/armada_fbdev.c
@@ -129,7 +129,7 @@  int armada_fbdev_init(struct drm_device *dev)
 
 	priv->fbdev = fbh;
 
-	drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(dev, fbh);
 	if (ret) {
@@ -137,7 +137,7 @@  int armada_fbdev_init(struct drm_device *dev)
 		goto err_fb_helper;
 	}
 
-	ret = drm_fb_helper_initial_config(fbh, 32);
+	ret = drm_fb_helper_initial_config(fbh);
 	if (ret) {
 		DRM_ERROR("failed to set initial config\n");
 		goto err_fb_setup;
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 258103d317ac..28c428e9c530 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -416,14 +416,30 @@  static void drm_fb_helper_damage_work(struct work_struct *work)
  * drm_fb_helper_prepare - setup a drm_fb_helper structure
  * @dev: DRM device
  * @helper: driver-allocated fbdev helper structure to set up
+ * @preferred_bpp: Preferred bits per pixel for the device.
  * @funcs: pointer to structure of functions associate with this helper
  *
  * Sets up the bare minimum to make the framebuffer helper usable. This is
  * useful to implement race-free initialization of the polling helpers.
  */
 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
+			   unsigned int preferred_bpp,
 			   const struct drm_fb_helper_funcs *funcs)
 {
+	/*
+	 * Pick a preferred bpp of 32 if no value has been given. This
+	 * will select XRGB8888 for the framebuffer formats. All drivers
+	 * have to support XRGB8888 for backwards compatibility with legacy
+	 * userspace, so it's the safe choice here.
+	 *
+	 * TODO: Replace struct drm_mode_config.preferred_depth and this
+	 *       bpp value with a preferred format that is given as struct
+	 *       drm_format_info. Then derive all other values from the
+	 *       format.
+	 */
+	if (!preferred_bpp)
+		preferred_bpp = 32;
+
 	INIT_LIST_HEAD(&helper->kernel_fb_list);
 	spin_lock_init(&helper->damage_lock);
 	INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
@@ -432,6 +448,7 @@  void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 	mutex_init(&helper->lock);
 	helper->funcs = funcs;
 	helper->dev = dev;
+	helper->preferred_bpp = preferred_bpp;
 }
 EXPORT_SYMBOL(drm_fb_helper_prepare);
 
@@ -2183,7 +2200,6 @@  __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
 /**
  * drm_fb_helper_initial_config - setup a sane initial connector configuration
  * @fb_helper: fb_helper device struct
- * @bpp_sel: bpp value to use for the framebuffer configuration
  *
  * Scans the CRTCs and connectors and tries to put together an initial setup.
  * At the moment, this is a cloned configuration across all heads with
@@ -2221,15 +2237,13 @@  __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
  * RETURNS:
  * Zero if everything went ok, nonzero otherwise.
  */
-int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
+int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper)
 {
 	int ret;
 
 	if (!drm_fbdev_emulation)
 		return 0;
 
-	fb_helper->preferred_bpp = bpp_sel;
-
 	mutex_lock(&fb_helper->lock);
 	ret = __drm_fb_helper_initial_config_and_unlock(fb_helper);
 
diff --git a/drivers/gpu/drm/drm_fbdev_generic.c b/drivers/gpu/drm/drm_fbdev_generic.c
index 63f66325a8a5..6ae014040df3 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -392,7 +392,7 @@  static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
 	if (!drm_drv_uses_atomic_modeset(dev))
 		drm_helper_disable_unused_functions(dev);
 
-	ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp);
+	ret = drm_fb_helper_initial_config(fb_helper);
 	if (ret)
 		goto err_cleanup;
 
@@ -454,7 +454,7 @@  void drm_fbdev_generic_setup(struct drm_device *dev,
 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 	if (!fb_helper)
 		return;
-	drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
+	drm_fb_helper_prepare(dev, fb_helper, preferred_bpp, &drm_fb_helper_generic_funcs);
 
 	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
 	if (ret) {
@@ -462,21 +462,6 @@  void drm_fbdev_generic_setup(struct drm_device *dev,
 		goto err_drm_client_init;
 	}
 
-	/*
-	 * Pick a preferred bpp of 32 if no value has been given. This
-	 * will select XRGB8888 for the framebuffer formats. All drivers
-	 * have to support XRGB8888 for backwards compatibility with legacy
-	 * userspace, so it's the safe choice here.
-	 *
-	 * TODO: Replace struct drm_mode_config.preferred_depth and this
-	 *       bpp value with a preferred format that is given as struct
-	 *       drm_format_info. Then derive all other values from the
-	 *       format.
-	 */
-	if (!preferred_bpp)
-		preferred_bpp = 32;
-	fb_helper->preferred_bpp = preferred_bpp;
-
 	ret = drm_fbdev_client_hotplug(&fb_helper->client);
 	if (ret)
 		drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index 55c92372fca0..b89e33af8da8 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -163,7 +163,7 @@  int exynos_drm_fbdev_init(struct drm_device *dev)
 
 	private->fb_helper = helper = &fbdev->drm_fb_helper;
 
-	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(dev, helper);
 	if (ret < 0) {
@@ -172,7 +172,7 @@  int exynos_drm_fbdev_init(struct drm_device *dev)
 		goto err_init;
 	}
 
-	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
+	ret = drm_fb_helper_initial_config(helper);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev->dev,
 			      "failed to set up hw configuration.\n");
diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c
index 52ae3ade9a61..1f04c07ee180 100644
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -409,7 +409,7 @@  int psb_fbdev_init(struct drm_device *dev)
 
 	dev_priv->fb_helper = fb_helper;
 
-	drm_fb_helper_prepare(dev, fb_helper, &psb_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(dev, fb_helper);
 	if (ret)
@@ -418,7 +418,7 @@  int psb_fbdev_init(struct drm_device *dev)
 	/* disable all the possible outputs/crtcs before entering KMS mode */
 	drm_helper_disable_unused_functions(dev);
 
-	ret = drm_fb_helper_initial_config(fb_helper, 32);
+	ret = drm_fb_helper_initial_config(fb_helper);
 	if (ret)
 		goto fini;
 
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 19f3b5d92a55..ed197db5861d 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -520,10 +520,12 @@  int intel_fbdev_init(struct drm_device *dev)
 		return -ENOMEM;
 
 	mutex_init(&ifbdev->hpd_lock);
-	drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
 
-	if (!intel_fbdev_init_bios(dev, ifbdev))
-		ifbdev->preferred_bpp = 32;
+	if (intel_fbdev_init_bios(dev, ifbdev))
+		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
+	else
+		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
 
 	ret = drm_fb_helper_init(dev, &ifbdev->helper);
 	if (ret) {
@@ -542,8 +544,7 @@  static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 	struct intel_fbdev *ifbdev = data;
 
 	/* Due to peculiar init order wrt to hpd handling this is separate. */
-	if (drm_fb_helper_initial_config(&ifbdev->helper,
-					 ifbdev->preferred_bpp))
+	if (drm_fb_helper_initial_config(&ifbdev->helper))
 		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 }
 
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
index 31e1e30cb52a..915b213f3a5c 100644
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -146,7 +146,7 @@  struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 
 	helper = &fbdev->base;
 
-	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(dev, helper);
 	if (ret) {
@@ -159,7 +159,7 @@  struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 	if (ret)
 		goto fini;
 
-	ret = drm_fb_helper_initial_config(helper, 32);
+	ret = drm_fb_helper_initial_config(helper);
 	if (ret)
 		goto fini;
 
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index 98d8758048fc..fc5f52d567c6 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -239,13 +239,13 @@  void omap_fbdev_init(struct drm_device *dev)
 
 	helper = &fbdev->base;
 
-	drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
+	drm_fb_helper_prepare(dev, helper, 32, &omap_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(dev, helper);
 	if (ret)
 		goto fail;
 
-	ret = drm_fb_helper_initial_config(helper, 32);
+	ret = drm_fb_helper_initial_config(helper);
 	if (ret)
 		goto fini;
 
diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index fe4087bfdb3c..6e5eed0e157c 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -348,7 +348,7 @@  int radeon_fbdev_init(struct radeon_device *rdev)
 	rfbdev->rdev = rdev;
 	rdev->mode_info.rfbdev = rfbdev;
 
-	drm_fb_helper_prepare(rdev->ddev, &rfbdev->helper,
+	drm_fb_helper_prepare(rdev->ddev, &rfbdev->helper, bpp_sel,
 			      &radeon_fb_helper_funcs);
 
 	ret = drm_fb_helper_init(rdev->ddev, &rfbdev->helper);
@@ -358,7 +358,7 @@  int radeon_fbdev_init(struct radeon_device *rdev)
 	/* disable all the possible outputs/crtcs before entering KMS mode */
 	drm_helper_disable_unused_functions(rdev->ddev);
 
-	ret = drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
+	ret = drm_fb_helper_initial_config(&rfbdev->helper);
 	if (ret)
 		goto fini;
 
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index a900300ae5bd..153c39c32c71 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -308,7 +308,7 @@  static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 		return ERR_PTR(-ENOMEM);
 	}
 
-	drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
+	drm_fb_helper_prepare(drm, &fbdev->base, 32, &tegra_fb_helper_funcs);
 
 	return fbdev;
 }
@@ -319,7 +319,6 @@  static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 }
 
 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
-			    unsigned int preferred_bpp,
 			    unsigned int num_crtc,
 			    unsigned int max_connectors)
 {
@@ -333,7 +332,7 @@  static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 		return err;
 	}
 
-	err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
+	err = drm_fb_helper_initial_config(&fbdev->base);
 	if (err < 0) {
 		dev_err(drm->dev, "failed to set initial configuration: %d\n",
 			err);
@@ -396,7 +395,7 @@  int tegra_drm_fb_init(struct drm_device *drm)
 	struct tegra_drm *tegra = drm->dev_private;
 	int err;
 
-	err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
+	err = tegra_fbdev_init(tegra->fbdev, drm->mode_config.num_crtc,
 			       drm->mode_config.num_connector);
 	if (err < 0)
 		return err;
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 39710c570a04..9604e67c2838 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -229,6 +229,7 @@  drm_fb_helper_from_client(struct drm_client_dev *client)
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
+			   unsigned int preferred_bpp,
 			   const struct drm_fb_helper_funcs *funcs);
 void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper);
 int drm_fb_helper_init(struct drm_device *dev, struct drm_fb_helper *helper);
@@ -284,7 +285,7 @@  int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 			unsigned long arg);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
+int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper);
 int drm_fb_helper_debug_enter(struct fb_info *info);
 int drm_fb_helper_debug_leave(struct fb_info *info);