[PATCH v2] media: venus: pm_helpers: add fallback for the opp-table

[Renjiang Han <quic_renjiang@quicinc.com>]

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@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Renjiang Han <quic_renjiang@quicinc.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 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 | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index 8dd5a9b0d060cddfeafd4da477ade0c7aeb6c390..77c12273dbb9505244e260fc8fa635e4fe045236 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;
@@ -48,7 +50,14 @@ static int core_clks_enable(struct venus_core *core)
 	int ret;
 
 	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
-	dev_pm_opp_put(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)) {

---
base-commit: d086c886ceb9f59dea6c3a9dae7eb89e780a20c9
change-id: 20250721-fallback_of_opp_table-4ea39376f617

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