evie/android_kernel_oneplus_msm8998
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msm: mdss: fix potential crash when sending backlight DCS commands

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If MDSS idle power collapse feature is enabled, MDSS GDSC can get
toggled when exiting idle power collapse. This may require an
explicit call to TZ to restore MDSS security configs prior to accessing
any MDSS registers, which is typically done whenever IOMMU is attached.
For panels where backlight is controlled using DCS commands, it is
possible that a backlight update could be triggered when MDSS is power
collapsed. This would result in enabling MDSS GDSC and restoring DSI
registers prior to sending the DCS commands. For such use cases, ensure
that IOMMU is attached prior to any register programming to avoid any
crashes.

Change-Id: I245d1180cfeedeb938e70b792fd6d627e86c5d14
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
This commit is contained in:
Aravind Venkateswaran 2015-01-14 23:19:03 -08:00 • committed by David Keitel
parent b088e80929
commit 4a73f2adf8
1 changed files with 2 additions and 1 deletions
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3
drivers/video/fbdev/msm/mdss_dsi_host.c
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@ -2023,7 +2023,6 @@ int mdss_dsi_cmdlist_commit(struct mdss_dsi_ctrl_pdata *ctrl, int from_mdp)
ctrl->mdss_util->bus_scale_set_quota(MDSS_DSI_RT, SZ_1M, SZ_1M);
pr_debug("%s: from_mdp=%d pid=%d\n", __func__, from_mdp, current->pid);
mdss_dsi_clk_ctrl(ctrl, DSI_ALL_CLKS, 1);
if (ctrl->mdss_util->iommu_ctrl) {
rc = ctrl->mdss_util->iommu_ctrl(1);
@ -2034,6 +2033,8 @@ int mdss_dsi_cmdlist_commit(struct mdss_dsi_ctrl_pdata *ctrl, int from_mdp)
}
}
mdss_dsi_clk_ctrl(ctrl, DSI_ALL_CLKS, 1);
if (req->flags & CMD_REQ_HS_MODE)
mdss_dsi_set_tx_power_mode(0, &ctrl->panel_data);