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authorDave Airlie <airlied@redhat.com>2009-08-28 15:46:53 +1000
committerDave Airlie <airlied@redhat.com>2009-08-31 09:09:31 +1000
commit785b93ef8c309730c2de84ce9c229e40e2d01480 (patch)
treeea1b26781fc49cef92d439fdaffa41af8c165778 /drivers/gpu/drm/drm_fb_helper.c
parent7dc482dfeeeefcfd000d4271c4626937406756d7 (diff)
drm/kms: move driver specific fb common code to helper functions (v2)
Initially I always meant this code to be shared, but things ran away from me before I got to it. This refactors the i915 and radeon kms fbdev interaction layers out into generic helpers + driver specific pieces. It moves all the panic/sysrq enhancements to the core file, and stores a linked list of kernel fbs. This could possibly be improved to only store the fb which has fbcon on it for panics etc. radeon retains some specific codes used for a big endian workaround. changes: fix oops in v1 fix freeing path for crtc_info Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
-rw-r--r--drivers/gpu/drm/drm_fb_helper.c697
1 files changed, 697 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
new file mode 100644
index 00000000000..d6ffea74a50
--- /dev/null
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -0,0 +1,697 @@
+/*
+ * Copyright (c) 2006-2009 Red Hat Inc.
+ * Copyright (c) 2006-2008 Intel Corporation
+ * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
+ *
+ * DRM framebuffer helper functions
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ *
+ * Authors:
+ * Dave Airlie <airlied@linux.ie>
+ * Jesse Barnes <jesse.barnes@intel.com>
+ */
+#include <linux/sysrq.h>
+#include <linux/fb.h>
+#include "drmP.h"
+#include "drm_crtc.h"
+#include "drm_fb_helper.h"
+#include "drm_crtc_helper.h"
+
+static LIST_HEAD(kernel_fb_helper_list);
+
+bool drm_fb_helper_force_kernel_mode(void)
+{
+ int i = 0;
+ bool ret, error = false;
+ struct drm_fb_helper *helper;
+
+ if (list_empty(&kernel_fb_helper_list))
+ return false;
+
+ list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
+ for (i = 0; i < helper->crtc_count; i++) {
+ struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
+ ret = drm_crtc_helper_set_config(mode_set);
+ if (ret)
+ error = true;
+ }
+ }
+ return error;
+}
+
+int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
+ void *panic_str)
+{
+ DRM_ERROR("panic occurred, switching back to text console\n");
+ return drm_fb_helper_force_kernel_mode();
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_panic);
+
+static struct notifier_block paniced = {
+ .notifier_call = drm_fb_helper_panic,
+};
+
+/**
+ * drm_fb_helper_restore - restore the framebuffer console (kernel) config
+ *
+ * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
+ */
+void drm_fb_helper_restore(void)
+{
+ bool ret;
+ ret = drm_fb_helper_force_kernel_mode();
+ if (ret == true)
+ DRM_ERROR("Failed to restore crtc configuration\n");
+}
+EXPORT_SYMBOL(drm_fb_helper_restore);
+
+static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
+{
+ drm_fb_helper_restore();
+}
+static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
+
+static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
+{
+ schedule_work(&drm_fb_helper_restore_work);
+}
+
+static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
+ .handler = drm_fb_helper_sysrq,
+ .help_msg = "force-fb(V)",
+ .action_msg = "Restore framebuffer console",
+};
+
+static void drm_fb_helper_on(struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_crtc *crtc;
+ struct drm_encoder *encoder;
+ int i;
+
+ /*
+ * For each CRTC in this fb, turn the crtc on then,
+ * find all associated encoders and turn them on.
+ */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
+ break;
+ }
+
+ mutex_lock(&dev->mode_config.mutex);
+ crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
+ mutex_unlock(&dev->mode_config.mutex);
+
+ /* Found a CRTC on this fb, now find encoders */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ if (encoder->crtc == crtc) {
+ struct drm_encoder_helper_funcs *encoder_funcs;
+
+ encoder_funcs = encoder->helper_private;
+ mutex_lock(&dev->mode_config.mutex);
+ encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
+ mutex_unlock(&dev->mode_config.mutex);
+ }
+ }
+ }
+}
+
+static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_crtc *crtc;
+ struct drm_encoder *encoder;
+ int i;
+
+ /*
+ * For each CRTC in this fb, find all associated encoders
+ * and turn them off, then turn off the CRTC.
+ */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
+ break;
+ }
+
+ /* Found a CRTC on this fb, now find encoders */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ if (encoder->crtc == crtc) {
+ struct drm_encoder_helper_funcs *encoder_funcs;
+
+ encoder_funcs = encoder->helper_private;
+ mutex_lock(&dev->mode_config.mutex);
+ encoder_funcs->dpms(encoder, dpms_mode);
+ mutex_unlock(&dev->mode_config.mutex);
+ }
+ }
+ if (dpms_mode == DRM_MODE_DPMS_OFF) {
+ mutex_lock(&dev->mode_config.mutex);
+ crtc_funcs->dpms(crtc, dpms_mode);
+ mutex_unlock(&dev->mode_config.mutex);
+ }
+ }
+}
+
+int drm_fb_helper_blank(int blank, struct fb_info *info)
+{
+ switch (blank) {
+ case FB_BLANK_UNBLANK:
+ drm_fb_helper_on(info);
+ break;
+ case FB_BLANK_NORMAL:
+ drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
+ break;
+ case FB_BLANK_HSYNC_SUSPEND:
+ drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
+ break;
+ case FB_BLANK_VSYNC_SUSPEND:
+ drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
+ break;
+ case FB_BLANK_POWERDOWN:
+ drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
+ break;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_blank);
+
+static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
+{
+ int i;
+
+ for (i = 0; i < helper->crtc_count; i++)
+ kfree(helper->crtc_info[i].mode_set.connectors);
+ kfree(helper->crtc_info);
+}
+
+int drm_fb_helper_init_crtc_count(struct drm_fb_helper *helper, int crtc_count, int max_conn_count)
+{
+ struct drm_device *dev = helper->dev;
+ struct drm_crtc *crtc;
+ int ret = 0;
+ int i;
+
+ helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
+ if (!helper->crtc_info)
+ return -ENOMEM;
+
+ helper->crtc_count = crtc_count;
+
+ for (i = 0; i < crtc_count; i++) {
+ helper->crtc_info[i].mode_set.connectors =
+ kcalloc(max_conn_count,
+ sizeof(struct drm_connector *),
+ GFP_KERNEL);
+
+ if (!helper->crtc_info[i].mode_set.connectors) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+ helper->crtc_info[i].mode_set.num_connectors = 0;
+ }
+
+ i = 0;
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ helper->crtc_info[i].crtc_id = crtc->base.id;
+ helper->crtc_info[i].mode_set.crtc = crtc;
+ i++;
+ }
+ helper->conn_limit = max_conn_count;
+ return 0;
+out_free:
+ drm_fb_helper_crtc_free(helper);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(drm_fb_helper_init_crtc_count);
+
+int drm_fb_helper_setcolreg(unsigned regno,
+ unsigned red,
+ unsigned green,
+ unsigned blue,
+ unsigned transp,
+ struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_crtc *crtc;
+ int i;
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ struct drm_framebuffer *fb = fb_helper->fb;
+
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
+ break;
+ }
+ if (i == fb_helper->crtc_count)
+ continue;
+
+ if (regno > 255)
+ return 1;
+
+ if (fb->depth == 8) {
+ fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
+ return 0;
+ }
+
+ if (regno < 16) {
+ switch (fb->depth) {
+ case 15:
+ fb->pseudo_palette[regno] = ((red & 0xf800) >> 1) |
+ ((green & 0xf800) >> 6) |
+ ((blue & 0xf800) >> 11);
+ break;
+ case 16:
+ fb->pseudo_palette[regno] = (red & 0xf800) |
+ ((green & 0xfc00) >> 5) |
+ ((blue & 0xf800) >> 11);
+ break;
+ case 24:
+ case 32:
+ fb->pseudo_palette[regno] =
+ (((red >> 8) & 0xff) << info->var.red.offset) |
+ (((green >> 8) & 0xff) << info->var.green.offset) |
+ (((blue >> 8) & 0xff) << info->var.blue.offset);
+ break;
+ }
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_setcolreg);
+
+int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_framebuffer *fb = fb_helper->fb;
+ int depth;
+
+ if (var->pixclock == -1 || !var->pixclock)
+ return -EINVAL;
+
+ /* Need to resize the fb object !!! */
+ if (var->xres > fb->width || var->yres > fb->height) {
+ DRM_ERROR("Requested width/height is greater than current fb "
+ "object %dx%d > %dx%d\n", var->xres, var->yres,
+ fb->width, fb->height);
+ DRM_ERROR("Need resizing code.\n");
+ return -EINVAL;
+ }
+
+ switch (var->bits_per_pixel) {
+ case 16:
+ depth = (var->green.length == 6) ? 16 : 15;
+ break;
+ case 32:
+ depth = (var->transp.length > 0) ? 32 : 24;
+ break;
+ default:
+ depth = var->bits_per_pixel;
+ break;
+ }
+
+ switch (depth) {
+ case 8:
+ var->red.offset = 0;
+ var->green.offset = 0;
+ var->blue.offset = 0;
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ var->transp.length = 0;
+ var->transp.offset = 0;
+ break;
+ case 15:
+ var->red.offset = 10;
+ var->green.offset = 5;
+ var->blue.offset = 0;
+ var->red.length = 5;
+ var->green.length = 5;
+ var->blue.length = 5;
+ var->transp.length = 1;
+ var->transp.offset = 15;
+ break;
+ case 16:
+ var->red.offset = 11;
+ var->green.offset = 5;
+ var->blue.offset = 0;
+ var->red.length = 5;
+ var->green.length = 6;
+ var->blue.length = 5;
+ var->transp.length = 0;
+ var->transp.offset = 0;
+ break;
+ case 24:
+ var->red.offset = 16;
+ var->green.offset = 8;
+ var->blue.offset = 0;
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ var->transp.length = 0;
+ var->transp.offset = 0;
+ break;
+ case 32:
+ var->red.offset = 16;
+ var->green.offset = 8;
+ var->blue.offset = 0;
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ var->transp.length = 8;
+ var->transp.offset = 24;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_check_var);
+
+/* this will let fbcon do the mode init */
+int drm_fb_helper_set_par(struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct fb_var_screeninfo *var = &info->var;
+ struct drm_crtc *crtc;
+ int ret;
+ int i;
+
+ if (var->pixclock != -1) {
+ DRM_ERROR("PIXEL CLCOK SET\n");
+ return -EINVAL;
+ }
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
+ break;
+ }
+ if (i == fb_helper->crtc_count)
+ continue;
+
+ if (crtc->fb == fb_helper->crtc_info[i].mode_set.fb) {
+ mutex_lock(&dev->mode_config.mutex);
+ ret = crtc->funcs->set_config(&fb_helper->crtc_info->mode_set);
+ mutex_unlock(&dev->mode_config.mutex);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_set_par);
+
+int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_mode_set *modeset;
+ struct drm_crtc *crtc;
+ int ret = 0;
+ int i;
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
+ break;
+ }
+
+ if (i == fb_helper->crtc_count)
+ continue;
+
+ modeset = &fb_helper->crtc_info[i].mode_set;
+
+ modeset->x = var->xoffset;
+ modeset->y = var->yoffset;
+
+ if (modeset->num_connectors) {
+ mutex_lock(&dev->mode_config.mutex);
+ ret = crtc->funcs->set_config(modeset);
+ mutex_unlock(&dev->mode_config.mutex);
+ if (!ret) {
+ info->var.xoffset = var->xoffset;
+ info->var.yoffset = var->yoffset;
+ }
+ }
+ }
+ return ret;
+}
+EXPORT_SYMBOL(drm_fb_helper_pan_display);
+
+int drm_fb_helper_single_fb_probe(struct drm_device *dev,
+ int (*fb_create)(struct drm_device *dev,
+ uint32_t fb_width,
+ uint32_t fb_height,
+ uint32_t surface_width,
+ uint32_t surface_height,
+ struct drm_framebuffer **fb_ptr))
+{
+ struct drm_crtc *crtc;
+ struct drm_connector *connector;
+ unsigned int fb_width = (unsigned)-1, fb_height = (unsigned)-1;
+ unsigned int surface_width = 0, surface_height = 0;
+ int new_fb = 0;
+ int crtc_count = 0;
+ int ret, i, conn_count = 0;
+ struct fb_info *info;
+ struct drm_framebuffer *fb;
+ struct drm_mode_set *modeset = NULL;
+ struct drm_fb_helper *fb_helper;
+
+ /* first up get a count of crtcs now in use and new min/maxes width/heights */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ if (drm_helper_crtc_in_use(crtc)) {
+ if (crtc->desired_mode) {
+ if (crtc->desired_mode->hdisplay < fb_width)
+ fb_width = crtc->desired_mode->hdisplay;
+
+ if (crtc->desired_mode->vdisplay < fb_height)
+ fb_height = crtc->desired_mode->vdisplay;
+
+ if (crtc->desired_mode->hdisplay > surface_width)
+ surface_width = crtc->desired_mode->hdisplay;
+
+ if (crtc->desired_mode->vdisplay > surface_height)
+ surface_height = crtc->desired_mode->vdisplay;
+ }
+ crtc_count++;
+ }
+ }
+
+ if (crtc_count == 0 || fb_width == -1 || fb_height == -1) {
+ /* hmm everyone went away - assume VGA cable just fell out
+ and will come back later. */
+ return 0;
+ }
+
+ /* do we have an fb already? */
+ if (list_empty(&dev->mode_config.fb_kernel_list)) {
+ ret = (*fb_create)(dev, fb_width, fb_height, surface_width,
+ surface_height, &fb);
+ if (ret)
+ return -EINVAL;
+ new_fb = 1;
+ } else {
+ fb = list_first_entry(&dev->mode_config.fb_kernel_list,
+ struct drm_framebuffer, filp_head);
+
+ /* if someone hotplugs something bigger than we have already allocated, we are pwned.
+ As really we can't resize an fbdev that is in the wild currently due to fbdev
+ not really being designed for the lower layers moving stuff around under it.
+ - so in the grand style of things - punt. */
+ if ((fb->width < surface_width) ||
+ (fb->height < surface_height)) {
+ DRM_ERROR("Framebuffer not large enough to scale console onto.\n");
+ return -EINVAL;
+ }
+ }
+
+ info = fb->fbdev;
+ fb_helper = info->par;
+
+ crtc_count = 0;
+ /* okay we need to setup new connector sets in the crtcs */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ modeset = &fb_helper->crtc_info[crtc_count].mode_set;
+ modeset->fb = fb;
+ conn_count = 0;
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ if (connector->encoder)
+ if (connector->encoder->crtc == modeset->crtc) {
+ modeset->connectors[conn_count] = connector;
+ conn_count++;
+ if (conn_count > fb_helper->conn_limit)
+ BUG();
+ }
+ }
+
+ for (i = conn_count; i < fb_helper->conn_limit; i++)
+ modeset->connectors[i] = NULL;
+
+ modeset->crtc = crtc;
+ crtc_count++;
+
+ modeset->num_connectors = conn_count;
+ if (modeset->crtc->desired_mode) {
+ if (modeset->mode)
+ drm_mode_destroy(dev, modeset->mode);
+ modeset->mode = drm_mode_duplicate(dev,
+ modeset->crtc->desired_mode);
+ }
+ }
+ fb_helper->crtc_count = crtc_count;
+ fb_helper->fb = fb;
+
+ if (new_fb) {
+ info->var.pixclock = -1;
+ if (register_framebuffer(info) < 0)
+ return -EINVAL;
+ } else {
+ drm_fb_helper_set_par(info);
+ }
+ printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
+ info->fix.id);
+
+ /* Switch back to kernel console on panic */
+ /* multi card linked list maybe */
+ if (list_empty(&kernel_fb_helper_list)) {
+ printk(KERN_INFO "registered panic notifier\n");
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &paniced);
+ register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
+ }
+ list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
+ return 0;
+}
+EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
+
+void drm_fb_helper_free(struct drm_fb_helper *helper)
+{
+ list_del(&helper->kernel_fb_list);
+ if (list_empty(&kernel_fb_helper_list)) {
+ printk(KERN_INFO "unregistered panic notifier\n");
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &paniced);
+ unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
+ }
+ drm_fb_helper_crtc_free(helper);
+}
+EXPORT_SYMBOL(drm_fb_helper_free);
+
+void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch)
+{
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ info->fix.type_aux = 0;
+ info->fix.xpanstep = 1; /* doing it in hw */
+ info->fix.ypanstep = 1; /* doing it in hw */
+ info->fix.ywrapstep = 0;
+ info->fix.accel = FB_ACCEL_I830;
+ info->fix.type_aux = 0;
+
+ info->fix.line_length = pitch;
+ return;
+}
+EXPORT_SYMBOL(drm_fb_helper_fill_fix);
+
+void drm_fb_helper_fill_var(struct fb_info *info, struct drm_framebuffer *fb,
+ uint32_t fb_width, uint32_t fb_height)
+{
+ info->pseudo_palette = fb->pseudo_palette;
+ info->var.xres_virtual = fb->width;
+ info->var.yres_virtual = fb->height;
+ info->var.bits_per_pixel = fb->bits_per_pixel;
+ info->var.xoffset = 0;
+ info->var.yoffset = 0;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->var.height = -1;
+ info->var.width = -1;
+
+ switch (fb->depth) {
+ case 8:
+ info->var.red.offset = 0;
+ info->var.green.offset = 0;
+ info->var.blue.offset = 0;
+ info->var.red.length = 8; /* 8bit DAC */
+ info->var.green.length = 8;
+ info->var.blue.length = 8;
+ info->var.transp.offset = 0;
+ info->var.transp.length = 0;
+ break;
+ case 15:
+ info->var.red.offset = 10;
+ info->var.green.offset = 5;
+ info->var.blue.offset = 0;
+ info->var.red.length = 5;
+ info->var.green.length = 5;
+ info->var.blue.length = 5;
+ info->var.transp.offset = 15;
+ info->var.transp.length = 1;
+ break;
+ case 16:
+ info->var.red.offset = 11;
+ info->var.green.offset = 5;
+ info->var.blue.offset = 0;
+ info->var.red.length = 5;
+ info->var.green.length = 6;
+ info->var.blue.length = 5;
+ info->var.transp.offset = 0;
+ break;
+ case 24:
+ info->var.red.offset = 16;
+ info->var.green.offset = 8;
+ info->var.blue.offset = 0;
+ info->var.red.length = 8;
+ info->var.green.length = 8;
+ info->var.blue.length = 8;
+ info->var.transp.offset = 0;
+ info->var.transp.length = 0;
+ break;
+ case 32:
+ info->var.red.offset = 16;
+ info->var.green.offset = 8;
+ info->var.blue.offset = 0;
+ info->var.red.length = 8;
+ info->var.green.length = 8;
+ info->var.blue.length = 8;
+ info->var.transp.offset = 24;
+ info->var.transp.length = 8;
+ break;
+ default:
+ break;
+ }
+
+ info->var.xres = fb_width;
+ info->var.yres = fb_height;
+}
+EXPORT_SYMBOL(drm_fb_helper_fill_var);