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

Thomas Zimmermann
2023-01-23T10:06:15Z

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(-)

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 123f2ef035c5..9331c36bdab6 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);

--
2.39.0