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Commit 5bd891e4 authored by Nilaan Gunabalachandran's avatar Nilaan Gunabalachandran Committed by Gerrit - the friendly Code Review server
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disp: msm: sde: fix failure in perf mode clk update through debugfs 



Setting perf tuning mode through debugfs during suspend can
result in underflow. Ensure that we are able to set rates,
or reset values and return to remain in normal mode.

Change-Id: Ib88de888690086d982b023b017083fee4e4d2091
Signed-off-by: default avatarNilaan Gunabalachandran <ngunabal@codeaurora.org>
parent c4f345dd

msm/sde/sde_core_perf.c

+8 −3
Original line number Diff line number Diff line
@@ -879,7 +879,7 @@ void sde_core_perf_crtc_update(struct drm_crtc *crtc, 


		if ((params_changed &&

				(new->core_clk_rate > old->core_clk_rate)) ||

				(!params_changed &&

				(!params_changed && new->core_clk_rate &&

				(new->core_clk_rate < old->core_clk_rate))) {

			old->core_clk_rate = new->core_clk_rate;

			update_clk = 1;
@@ -1037,12 +1037,17 @@ static ssize_t _sde_core_perf_mode_write(struct file *file, 


		ret = sde_power_clk_set_rate(perf->phandle,

				perf->clk_name, perf->max_core_clk_rate);

		if (ret)

		if (ret) {

			SDE_ERROR("failed to set %s clock rate %llu\n",

					perf->clk_name,

					perf->max_core_clk_rate);

		else



			perf->perf_tune.min_core_clk = 0;

			perf->perf_tune.min_bus_vote = 0;

			perf_mode = SDE_PERF_MODE_NORMAL;

		} else {

			DRM_INFO("minimum performance mode\n");

		}

		SDE_EVT32(perf->max_core_clk_rate, ret);

	} else if (perf_mode == SDE_PERF_MODE_NORMAL) {

		/* reset the perf tune params to 0 */