linux-kernel - [PATCH v3 1/9] soc: qcom: ubwc: add helper to get min

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Message-Id: <20260116-iris-ubwc-v3-1-662ac0e0761f@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 09:27:35 +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,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH v3 1/9] soc: qcom: ubwc: add helper to get min_acc length

MDSS and GPU drivers use different approaches to get min_acc length.
Add helper function that can be used by all the drivers.

The helper reflects our current best guess, it blindly copies the
approach adopted by the MDSS drivers and it matches current values
selected by the GPU driver.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Acked-by: Bjorn Andersson <andersson@...nel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Reviewed-by: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 include/linux/soc/qcom/ubwc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/soc/qcom/ubwc.h b/include/linux/soc/qcom/ubwc.h
index 0a4edfe3d96d..719b31c8fb3c 100644
--- a/include/linux/soc/qcom/ubwc.h
+++ b/include/linux/soc/qcom/ubwc.h
@@ -73,4 +73,14 @@ static inline bool qcom_ubwc_get_ubwc_mode(const struct qcom_ubwc_cfg_data *cfg)
 	return ret;
 }
 
+/*
+ * This is the best guess, based on the MDSS driver, which worked so far.
+ */
+static inline bool qcom_ubwc_min_acc_length_64b(const struct qcom_ubwc_cfg_data *cfg)
+{
+	return cfg->ubwc_enc_version == UBWC_1_0 &&
+		(cfg->ubwc_dec_version == UBWC_2_0 ||
+		 cfg->ubwc_dec_version == UBWC_3_0);
+}
+
 #endif /* __QCOM_UBWC_H__ */

-- 
2.47.3