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msm_fb: display: skip one vsync event after enabling mdp and vsync clk

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Both mdp and mdp_vsync clks are disabled for command mode panel when
no new frames are being played. When they are re-enabled if new
requests come in, the first vsync event which is signaled by read
pointer interrupt arrives in a random time due to the sync between mdp
and panel, so skip it to maintain correct vsync timing.

Change-Id: I683b765e4a16d3d152b9270f5982234b94921f1e
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
(cherry picked from commit a4567ac320abe5d74b3c7decdbddba4bd8c57463)
This commit is contained in:
Huaibin Yang 2012-10-05 11:02:40 -07:00 committed by Stephen Boyd
parent 623763758a
commit 1844bc38ac
1 changed files with 8 additions and 0 deletions
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8
drivers/video/msm/mdp4_overlay_dsi_cmd.c
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@ -70,6 +70,7 @@ static struct vsycn_ctrl {
struct vsync_update vlist[2];
int vsync_enabled;
int clk_enabled;
int new_update;
int clk_control;
ktime_t vsync_time;
struct work_struct clk_work;
@ -421,6 +422,7 @@ void mdp4_dsi_cmd_vsync_ctrl(struct fb_info *info, int enable)
mipi_dsi_clk_cfg(1);
mdp_clk_ctrl(1);
vctrl->clk_enabled = 1;
vctrl->new_update = 1;
clk_set_on = 1;
}
if (clk_set_on) {
@ -517,6 +519,12 @@ static void primary_rdptr_isr(int cndx)
spin_lock(&vctrl->spin_lock);
vctrl->vsync_time = ktime_get();
if (vctrl->new_update) {
vctrl->new_update = 0;
spin_unlock(&vctrl->spin_lock);
return;
}
complete_all(&vctrl->vsync_comp);
vctrl->wait_vsync_cnt = 0;