linux-kernel - [PATCH 4/8] media: iris: scale MMCX power domain on SM8250

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Message-Id: <20260131-iris-venus-fix-sm8250-v1-4-b635ee66284c@oss.qualcomm.com>
Date: Sat, 31 Jan 2026 19:33:46 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Bryan O'Donoghue <bod@...nel.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Hans Verkuil <hverkuil@...nel.org>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Dikshita Agarwal <dikshita@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 4/8] media: iris: scale MMCX power domain on SM8250

On SM8250 most of the video clocks are powered by the MMCX domain, while
the PLL it powered on by the MX domain. Extend the driver to support
scaling both power domains, while keeping compatibitility with the
existing DTs, which define only the MX domain.

Fixes: 79865252acb6 ("media: iris: enable video driver probe of SM8250 SoC")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_platform_gen1.c | 2 +-
 drivers/media/platform/qcom/iris/iris_probe.c         | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen1.c b/drivers/media/platform/qcom/iris/iris_platform_gen1.c
index df8e6bf9430e..aa71f7f53ee3 100644
--- a/drivers/media/platform/qcom/iris/iris_platform_gen1.c
+++ b/drivers/media/platform/qcom/iris/iris_platform_gen1.c
@@ -281,7 +281,7 @@ static const struct bw_info sm8250_bw_table_dec[] = {
 
 static const char * const sm8250_pmdomain_table[] = { "venus", "vcodec0" };
 
-static const char * const sm8250_opp_pd_table[] = { "mx" };
+static const char * const sm8250_opp_pd_table[] = { "mx", "mmcx" };
 
 static const struct platform_clk_data sm8250_clk_table[] = {
 	{IRIS_AXI_CLK,  "iface"        },
diff --git a/drivers/media/platform/qcom/iris/iris_probe.c b/drivers/media/platform/qcom/iris/iris_probe.c
index 7b612ad37e4f..74ec81e3d622 100644
--- a/drivers/media/platform/qcom/iris/iris_probe.c
+++ b/drivers/media/platform/qcom/iris/iris_probe.c
@@ -64,6 +64,13 @@ static int iris_init_power_domains(struct iris_core *core)
 		return ret;
 
 	ret =  devm_pm_domain_attach_list(core->dev, &iris_opp_pd_data, &core->opp_pmdomain_tbl);
+	/* backwards compatibility for incomplete ABI SM8250 */
+	if (ret == -ENODEV &&
+	    of_device_is_compatible(core->dev->of_node, "qcom,sm8250-venus")) {
+		iris_opp_pd_data.num_pd_names--;
+		ret = devm_pm_domain_attach_list(core->dev, &iris_opp_pd_data,
+						 &core->opp_pmdomain_tbl);
+	}
 	if (ret < 0)
 		return ret;
 

-- 
2.47.3