[PATCH v9 19/20] drm/msm/a6xx: Add A619_holi speedbin support

[Konrad Dybcio]

A619_holi is implemented on at least two SoCs: SM4350 (holi) and SM6375
(blair). This is what seems to be a first occurrence of this happening,
but it's easy to overcome by guarding the SoC-specific fuse values with
of_machine_is_compatible(). Do just that to enable frequency limiting
on these SoCs.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
Reviewed-by: Akhil P Oommen <quic_akhilpo at quicinc.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio at linaro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index d7139eae0f73..ff9a8d342c77 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -2216,6 +2216,34 @@ static u32 a618_get_speed_bin(u32 fuse)
 	return UINT_MAX;
 }
 
+static u32 a619_holi_get_speed_bin(u32 fuse)
+{
+	/*
+	 * There are (at least) two SoCs implementing A619_holi: SM4350 (holi)
+	 * and SM6375 (blair). Limit the fuse matching to the corresponding
+	 * SoC to prevent bogus frequency setting (as improbable as it may be,
+	 * given unexpected fuse values are.. unexpected! But still possible.)
+	 */
+
+	if (fuse == 0)
+		return 0;
+
+	if (of_machine_is_compatible("qcom,sm4350")) {
+		if (fuse == 138)
+			return 1;
+		else if (fuse == 92)
+			return 2;
+	} else if (of_machine_is_compatible("qcom,sm6375")) {
+		if (fuse == 190)
+			return 1;
+		else if (fuse == 177)
+			return 2;
+	} else
+		pr_warn("Unknown SoC implementing A619_holi!\n");
+
+	return UINT_MAX;
+}
+
 static u32 a619_get_speed_bin(u32 fuse)
 {
 	if (fuse == 0)
@@ -2276,6 +2304,9 @@ static u32 fuse_to_supp_hw(struct device *dev, struct adreno_gpu *adreno_gpu, u3
 	if (adreno_is_a618(adreno_gpu))
 		val = a618_get_speed_bin(fuse);
 
+	else if (adreno_is_a619_holi(adreno_gpu))
+		val = a619_holi_get_speed_bin(fuse);
+
 	else if (adreno_is_a619(adreno_gpu))
 		val = a619_get_speed_bin(fuse);
 

-- 
2.41.0