[PATCH 2/3] mx3fb: support pan display with fb_set_var
From: Liu Ying <hidden>
Date: 2012-06-11 01:58:49
Also in:
linux-fbdev, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Users may call FBIOPUT_VSCREENINFO ioctrl to do pan display. This ioctrl relies on fb_set_var() to do the job. fb_set_var() calls the custom fb_set_par() method and then calls the custom fb_pan_display() method. Before calling the custom fb_pan_display() method, info->var is already updated from the new *var in fb_set_var(). And, the custom fb_pan_display() method checks if xoffset and yoffset in info->var and the new *var are different before doing actual panning, which prevents the panning from happening within fb_set_var() context. This patch caches the current var info locally in mx3fb driver so that pan display with fb_set_var is supported. Signed-off-by: Liu Ying <redacted> --- drivers/video/mx3fb.c | 33 ++++++++++++++++++++++++++------- 1 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index d53db60..2dd11c4 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c@@ -268,7 +268,7 @@ struct mx3fb_info { dma_cookie_t cookie; struct scatterlist sg[2]; - u32 sync; /* preserve var->sync flags */ + struct fb_var_screeninfo cur_var; /* current var info */ }; static void mx3fb_dma_done(void *);
@@ -723,7 +723,7 @@ static void mx3fb_dma_done(void *arg) static int __set_par(struct fb_info *fbi, bool lock) { - u32 mem_len; + u32 mem_len, cur_xoffset, cur_yoffset; struct ipu_di_signal_cfg sig_cfg; enum ipu_panel mode = IPU_PANEL_TFT; struct mx3fb_info *mx3_fbi = fbi->par;
@@ -805,8 +805,25 @@ static int __set_par(struct fb_info *fbi, bool lock) video->out_height = fbi->var.yres; video->out_stride = fbi->var.xres_virtual; - if (mx3_fbi->blank == FB_BLANK_UNBLANK) + if (mx3_fbi->blank == FB_BLANK_UNBLANK) { sdc_enable_channel(mx3_fbi); + /* + * sg[0] points to fb smem_start address + * and is actually active in controller. + */ + mx3_fbi->cur_var.xoffset = 0; + mx3_fbi->cur_var.yoffset = 0; + } + + /* + * Preserve xoffset and yoffest in case they are + * inactive in controller as fb is blanked. + */ + cur_xoffset = mx3_fbi->cur_var.xoffset; + cur_yoffset = mx3_fbi->cur_var.yoffset; + mx3_fbi->cur_var = fbi->var; + mx3_fbi->cur_var.xoffset = cur_xoffset; + mx3_fbi->cur_var.yoffset = cur_yoffset; return 0; }
@@ -926,8 +943,8 @@ static int mx3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *fbi) var->grayscale = 0; /* Preserve sync flags */ - var->sync |= mx3_fbi->sync; - mx3_fbi->sync |= var->sync; + var->sync |= mx3_fbi->cur_var.sync; + mx3_fbi->cur_var.sync |= var->sync; return 0; }
@@ -1073,8 +1090,8 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var, return -EINVAL; } - if (fbi->var.xoffset == var->xoffset && - fbi->var.yoffset == var->yoffset) + if (mx3_fbi->cur_var.xoffset == var->xoffset && + mx3_fbi->cur_var.yoffset == var->yoffset) return 0; /* No change, do nothing */ y_bottom = var->yoffset;
@@ -1157,6 +1174,8 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var, else fbi->var.vmode &= ~FB_VMODE_YWRAP; + mx3_fbi->cur_var = fbi->var; + mutex_unlock(&mx3_fbi->mutex); dev_dbg(fbi->device, "Update complete\n");
--
1.7.1