linux-kernel - [PATCH 3/8] media: venus: hfi_venus: Support only updating certain bits with presets

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Message-Id: <20250304-b4-linux-media-comitters-sc8280xp-venus-v1-3-279c7ea55493@linaro.org>
Date: Tue, 04 Mar 2025 13:07:09 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Stanimir Varbanov <stanimir.k.varbanov@...il.com>, 
 Vikash Garodia <quic_vgarodia@...cinc.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Johan Hovold <johan+linaro@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Subject: [PATCH 3/8] media: venus: hfi_venus: Support only updating certain
 bits with presets

From: Konrad Dybcio <konradybcio@...nel.org>

On some platforms (like SM8350) we're expected to only touch certain bits
(such as 0 and 4 corresponding to mask 0x11). Add support for doing so.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Link: https://lore.kernel.org/r/20230731-topic-8280_venus-v1-3-8c8bbe1983a5@linaro.org
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/media/platform/qcom/venus/core.h      |  1 +
 drivers/media/platform/qcom/venus/hfi_venus.c | 15 ++++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index abeeafa866971..b595f72b3afc4 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -38,6 +38,7 @@ struct freq_tbl {
 struct reg_val {
 	u32 reg;
 	u32 value;
+	u32 mask;
 };
 
 struct bw_tbl {
diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index a9167867063c4..ef2ea4727758f 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -359,10 +359,19 @@ static void venus_set_registers(struct venus_hfi_device *hdev)
 	const struct venus_resources *res = hdev->core->res;
 	const struct reg_val *tbl = res->reg_tbl;
 	unsigned int count = res->reg_tbl_size;
-	unsigned int i;
+	unsigned int i, val;
+
+	for (i = 0; i < count; i++) {
+		val = tbl[i].value;
 
-	for (i = 0; i < count; i++)
-		writel(tbl[i].value, hdev->core->base + tbl[i].reg);
+		/* In some cases, we only want to update certain bits */
+		if (tbl[i].mask) {
+			val = readl(hdev->core->base + tbl[i].reg);
+			val = (val & ~tbl[i].mask) | (tbl[i].value & tbl[i].mask);
+		}
+
+		writel(val, hdev->core->base + tbl[i].reg);
+	}
 }
 
 static void venus_soft_int(struct venus_hfi_device *hdev)

-- 
2.47.2