linux-kernel - [PATCH v3 2/9] soc: qcom: ubwc: add helpers to get programmable values

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Message-Id: <20260116-iris-ubwc-v3-2-662ac0e0761f@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 09:27:36 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-media@...r.kernel.org
Subject: [PATCH v3 2/9] soc: qcom: ubwc: add helpers to get programmable
 values

Currently the database stores macrotile_mode in the data. However it
can be derived from the rest of the data: it should be used for UBWC
encoding >= 3.0 except for several corner cases (SM8150 and SC8180X).

The ubwc_bank_spread field seems to be based on the impreside data we
had for the MDSS and DPU programming. In some cases UBWC engine inside
the display controller doesn't need to program it, although bank spread
is to be enabled.

Bank swizzle is also currently stored as is, but it is almost standard
(banks 1-3 for UBWC 1.0 and 2-3 for other versions), the only exception
being Lemans (it uses only bank 3).

Add helpers returning values from the config for now. They will be
rewritten later, in a separate series, but having the helper now
simplifies refacroring the code later.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 include/linux/soc/qcom/ubwc.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/soc/qcom/ubwc.h b/include/linux/soc/qcom/ubwc.h
index 719b31c8fb3c..4801f288af81 100644
--- a/include/linux/soc/qcom/ubwc.h
+++ b/include/linux/soc/qcom/ubwc.h
@@ -83,4 +83,19 @@ static inline bool qcom_ubwc_min_acc_length_64b(const struct qcom_ubwc_cfg_data
 		 cfg->ubwc_dec_version == UBWC_3_0);
 }
 
+static inline bool qcom_ubwc_macrotile_mode(const struct qcom_ubwc_cfg_data *cfg)
+{
+	return cfg->macrotile_mode;
+}
+
+static inline bool qcom_ubwc_bank_spread(const struct qcom_ubwc_cfg_data *cfg)
+{
+	return cfg->ubwc_bank_spread;
+}
+
+static inline u32 qcom_ubwc_swizzle(const struct qcom_ubwc_cfg_data *cfg)
+{
+	return cfg->ubwc_swizzle;
+}
+
 #endif /* __QCOM_UBWC_H__ */

-- 
2.47.3