From: Chad Goodman <cgoodman@HP-EliteBook-2730p.(none)>
Date: Tue, 27 Nov 2012 03:01:35 +0000 (-0800)
Subject: GPU: force GPU clock to change 1 clock step at a time
X-Git-Url: https://ziggy471.com/git/gitweb.cgi?p=ziggy471-sgs3-jb.git;a=commitdiff;h=7ba69885981b38d5d4405a2e6c7d87553fc6acb8

GPU: force GPU clock to change 1 clock step at a time

Signed-off-by: Ziggy <ziggy@tardis.(none)>
---

--- a/drivers/gpu/msm/kgsl_pwrctrl.c
+++ b/drivers/gpu/msm/kgsl_pwrctrl.c
@@ -64,9 +64,17 @@ void kgsl_pwrctrl_pwrlevel_change(struct
 		new_level >= pwr->thermal_pwrlevel &&
 		new_level != pwr->active_pwrlevel) {
 		struct kgsl_pwrlevel *pwrlevel = &pwr->pwrlevels[new_level];
+		int diff = new_level - pwr->active_pwrlevel;
+		int d = (diff > 0) ? 1 : -1;
+		int level = pwr->active_pwrlevel;
 		pwr->active_pwrlevel = new_level;
 		if ((test_bit(KGSL_PWRFLAGS_CLK_ON, &pwr->power_flags)) ||
 			(device->state == KGSL_STATE_NAP)) {
+			while (level != new_level) {
+				level += d;
+				clk_set_rate(pwr->grp_clks[0],
+					pwr->pwrlevels[level].gpu_freq);
+			}
 			/*
 			 * On some platforms, instability is caused on
 			 * changing clock freq when the core is busy.