evie/android_kernel_oneplus_msm8998
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mdss: mdp: Update histogram start failure reporting

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Userspace clients will enable the histogram and disable it as per the
algorithm requirements. If the process under which the client is
running crashes and restarts states of histogram between client and
driver is not in sync. In case the driver is not in sync with client it
should return EBUSY error to client. Client will stop and start the
histogram to maintain the sync.

Change-Id: I7b3c8d7890d8ca24ecf065e48a9ea5884cc886de
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>
This commit is contained in:
Gopikrishnaiah Anandan 2015-06-01 11:47:58 -07:00 • committed by David Keitel
parent 4d9b8c2d45
commit f08932c70f
1 changed files with 7 additions and 1 deletions
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8
drivers/video/fbdev/msm/mdss_mdp_pp.c
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@ -3846,8 +3846,9 @@ static int pp_hist_enable(struct pp_hist_col_info *hist_info,
spin_lock_irqsave(&hist_info->hist_lock, flag);
if (hist_info->col_en) {
spin_unlock_irqrestore(&hist_info->hist_lock, flag);
pr_info("%s Hist collection has already been enabled %p\n",
pr_err("%s Hist collection has already been enabled %p\n",
__func__, hist_info->base);
ret = -EBUSY;
goto exit;
}
hist_info->col_state = HIST_IDLE;
@ -3968,6 +3969,11 @@ int mdss_mdp_hist_start(struct mdp_histogram_start_req *req)
hist_info->disp_num = PP_BLOCK(req->block);
hist_info->ctl = ctl;
ret = pp_hist_enable(hist_info, req);
if (ret) {
pr_err("failed to enable histogram dspp_num %d ret %d\n",
dspp_num, ret);
goto hist_stop_clk;
}
mdss_pp_res->pp_disp_flags[disp_num] |=
PP_FLAGS_DIRTY_HIST_COL;
}