linux-kernel - [PATCH v3] media: venus: pm_helpers: add fallback for the opp-table

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Message-ID: <20250918-fallback_of_opp_table-v3-1-f07b34eb7b3a@quicinc.com>
Date: Thu, 18 Sep 2025 17:31:08 +0530
From: Renjiang Han <quic_renjiang@...cinc.com>
To: <quic_qiweil@...cinc.com>, <quic_wangaow@...cinc.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>,
        Hans Verkuil
	<hverkuil@...nel.org>
CC: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>,
        Renjiang Han
	<quic_renjiang@...cinc.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>
Subject: [PATCH v3] media: venus: pm_helpers: add fallback for the
 opp-table

Since the device trees for both HFI_VERSION_1XX and HFI_VERSION_3XX
do not include an opp-table and have not configured opp-pmdomain, they
still need to use the frequencies defined in the driver's freq_tbl.

Both core_power_v1 and core_power_v4 functions require core_clks_enable
function during POWER_ON. Therefore, in the core_clks_enable function,
if calling dev_pm_opp_find_freq_ceil to obtain the frequency fails,
it needs to fall back to the freq_tbl to retrieve the frequency.

Fixes: b179234b5e59 ("media: venus: pm_helpers: use opp-table for the frequency")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Reviewed-by: Vikash Garodia <quic_vgarodia@...cinc.com>
Closes: https://lore.kernel.org/linux-media/CA+G9fYu5=3n84VY+vTbCAcfFKOq7Us5vgBZgpypY4MveM=eVwg@mail.gmail.com
Signed-off-by: Renjiang Han <quic_renjiang@...cinc.com>
---
Since device trees for both HFI_VERSION_1XX and HFI_VERSION_3XX do not
contain an opp-table and have not configured opp-pmdomain, they still
need to use the frequencies defined in the driver's freq_tbl.

Therefore, if calling dev_pm_opp_find_freq_ceil to obtain the frequency
fails in the core_clks_enable, it needs to fall back to the freq_tbl to
retrieve the frequency.

Validated this series on QCS615 and msm8916.
---
Changes in v3:
- 1. Fix patch conflict issue.
- Link to v2: https://lore.kernel.org/r/20250724-fallback_of_opp_table-v2-1-2fc61f2407dc@quicinc.com

Changes in v2:
- 1. Update the returned error value as per the feedback.
- Link to v1: https://lore.kernel.org/r/20250723-fallback_of_opp_table-v1-1-20a6277fdded@quicinc.com
---
 drivers/media/platform/qcom/venus/pm_helpers.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index 88618378129a086274b61be5b23410783b92ca26..f0269524ac70eb72384a06aa6a215e2046abf5c2 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -40,6 +40,8 @@ static int core_clks_get(struct venus_core *core)
 
 static int core_clks_enable(struct venus_core *core)
 {
+	const struct freq_tbl *freq_tbl = core->res->freq_tbl;
+	unsigned int freq_tbl_size = core->res->freq_tbl_size;
 	const struct venus_resources *res = core->res;
 	struct device *dev = core->dev;
 	unsigned long freq = 0;
@@ -48,8 +50,13 @@ static int core_clks_enable(struct venus_core *core)
 	int ret;
 
 	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
-	if (!IS_ERR(opp))
+	if (IS_ERR(opp)) {
+		if (!freq_tbl)
+			return -ENODEV;
+		freq = freq_tbl[freq_tbl_size - 1].freq;
+	} else {
 		dev_pm_opp_put(opp);
+	}
 
 	for (i = 0; i < res->clks_num; i++) {
 		if (IS_V6(core) || (IS_V4(core) && is_lite(core))) {

---
base-commit: ae2d20002576d2893ecaff25db3d7ef9190ac0b6
change-id: 20250918-fallback_of_opp_table-bfae64cca1a0

Best regards,
-- 
Renjiang Han <quic_renjiang@...cinc.com>