drm/msm: Remove 'src_clk' from adreno configuration

The adreno code inherited a silly workaround from downstream
from the bad old days before decent clock control. grp_clk[0]
(named 'src_clk') doesn't actually exist - it was used as a proxy
for whatever the core clock actually was (usually 'core_clk').

All targets should be able to correctly request 'core_clk' and
get the right thing back so zap the anachronism and directly
use grp_clk[0] to control the clock rate.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_gpu.c

@@ -91,21 +91,16 @@ static int disable_pwrrail(struct msm_gpu *gpu)
 
 static int enable_clk(struct msm_gpu *gpu)
 {
-	struct clk *rate_clk = NULL;
 	int i;
 
-	/* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
-	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
-		if (gpu->grp_clks[i]) {
-			clk_prepare(gpu->grp_clks[i]);
-			rate_clk = gpu->grp_clks[i];
-		}
-	}
+	if (gpu->grp_clks[0] && gpu->fast_rate)
+		clk_set_rate(gpu->grp_clks[0], gpu->fast_rate);
 
-	if (rate_clk && gpu->fast_rate)
-		clk_set_rate(rate_clk, gpu->fast_rate);
+	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
+		if (gpu->grp_clks[i])
+			clk_prepare(gpu->grp_clks[i]);
 
-	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
+	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 		if (gpu->grp_clks[i])
 			clk_enable(gpu->grp_clks[i]);
 
@@ -114,24 +109,19 @@ static int enable_clk(struct msm_gpu *gpu)
 
 static int disable_clk(struct msm_gpu *gpu)
 {
-	struct clk *rate_clk = NULL;
 	int i;
 
-	/* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
-	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
-		if (gpu->grp_clks[i]) {
+	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
+		if (gpu->grp_clks[i])
 			clk_disable(gpu->grp_clks[i]);
-			rate_clk = gpu->grp_clks[i];
-		}
-	}
 
-	if (rate_clk && gpu->slow_rate)
-		clk_set_rate(rate_clk, gpu->slow_rate);
-
-	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
+	for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 		if (gpu->grp_clks[i])
 			clk_unprepare(gpu->grp_clks[i]);
 
+	if (gpu->grp_clks[0] && gpu->slow_rate)
+		clk_set_rate(gpu->grp_clks[0], gpu->slow_rate);
+
 	return 0;
 }
 
@@ -563,7 +553,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 }
 
 static const char *clk_names[] = {
-		"src_clk", "core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
+		"core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
 		"alt_mem_iface_clk",
 };
 

drivers/gpu/drm/msm/msm_gpu.h

@@ -103,7 +103,7 @@ struct msm_gpu {
 
 	/* Power Control: */
 	struct regulator *gpu_reg, *gpu_cx;
-	struct clk *ebi1_clk, *grp_clks[6];
+	struct clk *ebi1_clk, *grp_clks[5];
 	uint32_t fast_rate, slow_rate, bus_freq;
 
 #ifdef DOWNSTREAM_CONFIG_MSM_BUS_SCALING