drm/msm/a6xx: Use the per-GPU value for gmu_cgc_mode

This register's magic value differs wildly between different GPUs, use
the hardcoded data instead of trying to make some logic out of it.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/611096/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -402,7 +402,7 @@ static void a6xx_set_hwcg(struct msm_gpu *gpu, bool state)
 	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
 	const struct adreno_reglist *reg;
 	unsigned int i;
-	u32 val, clock_cntl_on, cgc_mode;
+	u32 val, clock_cntl_on;
 
 	if (!(adreno_gpu->info->a6xx->hwcg || adreno_is_a7xx(adreno_gpu)))
 		return;
@@ -417,10 +417,8 @@ static void a6xx_set_hwcg(struct msm_gpu *gpu, bool state)
 		clock_cntl_on = 0x8aa8aa82;
 
 	if (adreno_is_a7xx(adreno_gpu)) {
-		cgc_mode = adreno_is_a740_family(adreno_gpu) ? 0x20222 : 0x20000;
-
 		gmu_write(&a6xx_gpu->gmu, REG_A6XX_GPU_GMU_AO_GMU_CGC_MODE_CNTL,
-			  state ? cgc_mode : 0);
+			  state ? adreno_gpu->info->a6xx->gmu_cgc_mode : 0);
 		gmu_write(&a6xx_gpu->gmu, REG_A6XX_GPU_GMU_AO_GMU_CGC_DELAY_CNTL,
 			  state ? 0x10111 : 0);
 		gmu_write(&a6xx_gpu->gmu, REG_A6XX_GPU_GMU_AO_GMU_CGC_HYST_CNTL,