[PATCH v6 07/14] drm/msm/a6xx: Resolve the meaning of UBWC_MODE

[Konrad Dybcio]

From: Konrad Dybcio <konrad.dybcio at oss.qualcomm.com>

This bit is set iff the UBWC version is 1.0. That notably does not
include QCM2290's "no UBWC".

This commit is intentionally cross-subsystem to ease review, as the
patchset is intended to be merged together, with a maintainer
consensus.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio at oss.qualcomm.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |  2 +-
 include/linux/soc/qcom/ubwc.h         | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 3d9c98e56d92ed43cf6e702fbd2b5cbd3293ac5a..3d345844337608086ffec1998b47b315ada68a97 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -686,11 +686,11 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 	 */
 	BUG_ON(adreno_gpu->ubwc_config.highest_bank_bit < 13);
 	u32 hbb = adreno_gpu->ubwc_config.highest_bank_bit - 13;
+	bool ubwc_mode = qcom_ubwc_get_ubwc_mode(cfg);
 	bool amsbc = cfg->ubwc_enc_version >= UBWC_3_0;
 	u8 uavflagprd_inv = 0;
 	u32 hbb_hi = hbb >> 2;
 	u32 hbb_lo = hbb & 3;
-	u32 ubwc_mode = adreno_gpu->ubwc_config.ubwc_swizzle & 1;
 	u32 level2_swizzling_dis = !(adreno_gpu->ubwc_config.ubwc_swizzle & 2);
 
 	if (adreno_is_a650_family(adreno_gpu) || adreno_is_a7xx(adreno_gpu))
diff --git a/include/linux/soc/qcom/ubwc.h b/include/linux/soc/qcom/ubwc.h
index d65df559603d95e3db5bc04ce42e00a0b4785828..f0334f4ece2098ddf290eb182897cd8aa74608b3 100644
--- a/include/linux/soc/qcom/ubwc.h
+++ b/include/linux/soc/qcom/ubwc.h
@@ -62,4 +62,14 @@ static inline const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void)
 }
 #endif
 
+static inline bool qcom_ubwc_get_ubwc_mode(const struct qcom_ubwc_cfg_data *cfg)
+{
+	bool ret = cfg->ubwc_enc_version == UBWC_1_0;
+
+	if (ret && !(cfg->ubwc_swizzle & BIT(0)))
+		pr_err("UBWC config discrepancy - level 1 swizzling disabled on UBWC 1.0\n");
+
+	return ret;
+}
+
 #endif /* __QCOM_UBWC_H__ */

-- 
2.50.0