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From:   Bryan O'Donoghue <bryan.odonoghue@linaro.org>
To:     hverkuil-cisco@xs4all.nl, laurent.pinchart@ideasonboard.com,
        rfoss@kernel.org, todor.too@gmail.com, agross@kernel.org,
        andersson@kernel.org, konrad.dybcio@linaro.org, mchehab@kernel.org
Cc:     linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Subject: [PATCH 1/4] media: qcom: camss: Convert to per-VFE pointer for power-domain linkages
Date:   Tue, 24 Oct 2023 23:42:52 +0100
Message-ID: <20231024224255.754779-2-bryan.odonoghue@linaro.org>
In-Reply-To: <20231024224255.754779-1-bryan.odonoghue@linaro.org>
References: <20231024224255.754779-1-bryan.odonoghue@linaro.org>
MIME-Version: 1.0
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Precedence: bulk

Right now we use the top-level camss structure to provide pointers via
VFE id index back to genpd linkages.

In effect this hard-codes VFE indexes to power-domain indexes in the
dtsi and mandates a very particular ordering of power domains in the
dtsi, which bears no relationship to a real hardware dependency.

As a first step to rationalising the VFE power-domain code and breaking
the magic indexing in dtsi use per-VFE pointers to genpd linkages.

The top-level index in msm_vfe_subdev_init is still used to attain the
initial so no functional or logical change arises from this change.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 drivers/media/platform/qcom/camss/camss-vfe-170.c | 12 ++++++------
 drivers/media/platform/qcom/camss/camss-vfe-4-7.c | 12 ++++--------
 drivers/media/platform/qcom/camss/camss-vfe-4-8.c | 10 ++++------
 drivers/media/platform/qcom/camss/camss-vfe-480.c | 12 ++++++------
 drivers/media/platform/qcom/camss/camss-vfe.c     |  3 +++
 drivers/media/platform/qcom/camss/camss-vfe.h     |  2 ++
 6 files changed, 25 insertions(+), 26 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe-170.c b/drivers/media/platform/qcom/camss/camss-vfe-170.c
index 0b211fed12760..59b0ea0aac48f 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-170.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-170.c
@@ -638,7 +638,7 @@ static void vfe_pm_domain_off(struct vfe_device *vfe)
 	if (vfe->id >= camss->res->vfe_num)
 		return;
 
-	device_link_del(camss->genpd_link[vfe->id]);
+	device_link_del(vfe->genpd_link);
 }
 
 /*
@@ -653,11 +653,11 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
 	if (id >= camss->res->vfe_num)
 		return 0;
 
-	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id],
-						DL_FLAG_STATELESS |
-						DL_FLAG_PM_RUNTIME |
-						DL_FLAG_RPM_ACTIVE);
-	if (!camss->genpd_link[id])
+	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd,
+					  DL_FLAG_STATELESS |
+					  DL_FLAG_PM_RUNTIME |
+					  DL_FLAG_RPM_ACTIVE);
+	if (!vfe->genpd_link)
 		return -EINVAL;
 
 	return 0;
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
index b65ed0fef595e..c668494ee1e98 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
@@ -1109,14 +1109,10 @@ static void vfe_isr_read(struct vfe_device *vfe, u32 *value0, u32 *value1)
  */
 static void vfe_pm_domain_off(struct vfe_device *vfe)
 {
-	struct camss *camss;
-
 	if (!vfe)
 		return;
 
-	camss = vfe->camss;
-
-	device_link_del(camss->genpd_link[vfe->id]);
+	device_link_del(vfe->genpd_link);
 }
 
 /*
@@ -1128,10 +1124,10 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
 	struct camss *camss = vfe->camss;
 	enum vfe_line_id id = vfe->id;
 
-	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id], DL_FLAG_STATELESS |
-						DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd, DL_FLAG_STATELESS |
+					  DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
 
-	if (!camss->genpd_link[id]) {
+	if (!vfe->genpd_link) {
 		dev_err(vfe->camss->dev, "Failed to add VFE#%d to power domain\n", id);
 		return -EINVAL;
 	}
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
index 7b3805177f037..5bd5b6b3c992a 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
@@ -1099,9 +1099,7 @@ static void vfe_isr_read(struct vfe_device *vfe, u32 *value0, u32 *value1)
  */
 static void vfe_pm_domain_off(struct vfe_device *vfe)
 {
-	struct camss *camss = vfe->camss;
-
-	device_link_del(camss->genpd_link[vfe->id]);
+	device_link_del(vfe->genpd_link);
 }
 
 /*
@@ -1113,10 +1111,10 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
 	struct camss *camss = vfe->camss;
 	enum vfe_line_id id = vfe->id;
 
-	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id], DL_FLAG_STATELESS |
-						DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd, DL_FLAG_STATELESS |
+					  DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
 
-	if (!camss->genpd_link[id]) {
+	if (!vfe->genpd_link) {
 		dev_err(vfe->camss->dev, "Failed to add VFE#%d to power domain\n", id);
 		return -EINVAL;
 	}
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-480.c b/drivers/media/platform/qcom/camss/camss-vfe-480.c
index f2368b77fc6d6..ca16a7ebb2903 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-480.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-480.c
@@ -463,7 +463,7 @@ static void vfe_pm_domain_off(struct vfe_device *vfe)
 	if (vfe->id >= camss->res->vfe_num)
 		return;
 
-	device_link_del(camss->genpd_link[vfe->id]);
+	device_link_del(vfe->genpd_link);
 }
 
 /*
@@ -478,11 +478,11 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
 	if (id >= camss->res->vfe_num)
 		return 0;
 
-	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id],
-						DL_FLAG_STATELESS |
-						DL_FLAG_PM_RUNTIME |
-						DL_FLAG_RPM_ACTIVE);
-	if (!camss->genpd_link[id])
+	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd,
+					  DL_FLAG_STATELESS |
+					  DL_FLAG_PM_RUNTIME |
+					  DL_FLAG_RPM_ACTIVE);
+	if (!vfe->genpd_link)
 		return -EINVAL;
 
 	return 0;
diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index 4839e2cedfe58..3d31f4289b724 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -1347,6 +1347,9 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 	if (!res->line_num)
 		return -EINVAL;
 
+	if (camss->genpd)
+		vfe->genpd = camss->genpd[id];
+
 	vfe->line_num = res->line_num;
 	vfe->ops->subdev_init(dev, vfe);
 
diff --git a/drivers/media/platform/qcom/camss/camss-vfe.h b/drivers/media/platform/qcom/camss/camss-vfe.h
index 09baded0dcdd6..c1c50023d4876 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.h
+++ b/drivers/media/platform/qcom/camss/camss-vfe.h
@@ -150,6 +150,8 @@ struct vfe_device {
 	const struct vfe_hw_ops_gen1 *ops_gen1;
 	struct vfe_isr_ops isr_ops;
 	struct camss_video_ops video_ops;
+	struct device *genpd;
+	struct device_link *genpd_link;
 };
 
 struct camss_subdev_resources;
-- 
2.42.0