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Subject: media: qcom: camss: Add support for named power-domains
Author: Bryan O'Donoghue <bryan.odonog...@linaro.org>
Date: Wed Dec 6 13:25:00 2023 +0100
Right now we use fixed indexes to assign power-domains, with a
requirement for the TOP GDSC to come last in the list.
Adding support for named power-domains means the declaration in the dtsi
can come in any order.
After this change we continue to support the old indexing - if a SoC
resource declaration or the in-use dtb doesn't declare power-domain names
we fall back to the default legacy indexing.
From this point on though new SoC additions should contain named
power-domains, eventually we will drop support for legacy indexing.
Tested-by: Matti Lehtimäki <matti.lehtim...@gmail.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonog...@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/platform/qcom/camss/camss-vfe.c | 24 ++++++++++++++++++++-
drivers/media/platform/qcom/camss/camss.c | 31 +++++++++++++++++++++------
drivers/media/platform/qcom/camss/camss.h | 2 ++
3 files changed, 50 insertions(+), 7 deletions(-)
---
diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c
b/drivers/media/platform/qcom/camss/camss-vfe.c
index 60286dac60e0..b2f91c00acaf 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -1380,7 +1380,29 @@ int msm_vfe_subdev_init(struct camss *camss, struct
vfe_device *vfe,
if (!res->line_num)
return -EINVAL;
- if (res->has_pd) {
+ /* Power domain */
+
+ if (res->pd_name) {
+ vfe->genpd = dev_pm_domain_attach_by_name(camss->dev,
+ res->pd_name);
+ if (IS_ERR(vfe->genpd)) {
+ ret = PTR_ERR(vfe->genpd);
+ return ret;
+ }
+ }
+
+ if (!vfe->genpd && res->has_pd) {
+ /*
+ * Legacy magic index.
+ * Requires
+ * power-domain = <VFE_X>,
+ * <VFE_Y>,
+ * <TITAN_TOP>
+ * id must correspondng to the index of the VFE which must
+ * come before the TOP GDSC. VFE Lite has no individually
+ * collapasible domain which is why id < vfe_num is a valid
+ * check.
+ */
vfe->genpd = dev_pm_domain_attach_by_id(camss->dev, id);
if (IS_ERR(vfe->genpd))
return PTR_ERR(vfe->genpd);
diff --git a/drivers/media/platform/qcom/camss/camss.c
b/drivers/media/platform/qcom/camss/camss.c
index 35918cf837bd..8de0e9e8d34b 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -1522,13 +1522,32 @@ static int camss_configure_pd(struct camss *camss)
return 0;
/*
- * VFE power domains are in the beginning of the list, and while all
- * power domains should be attached, only if TITAN_TOP power domain is
- * found in the list, it should be linked over here.
+ * If a power-domain name is defined try to use it.
+ * It is possible we are running a new kernel with an old dtb so
+ * fallback to indexes even if a pd_name is defined but not found.
*/
- camss->genpd = dev_pm_domain_attach_by_id(camss->dev, camss->genpd_num
- 1);
- if (IS_ERR(camss->genpd)) {
- ret = PTR_ERR(camss->genpd);
+ if (camss->res->pd_name) {
+ camss->genpd = dev_pm_domain_attach_by_name(camss->dev,
+
camss->res->pd_name);
+ if (IS_ERR(camss->genpd)) {
+ ret = PTR_ERR(camss->genpd);
+ goto fail_pm;
+ }
+ }
+
+ if (!camss->genpd) {
+ /*
+ * Legacy magic index. TITAN_TOP GDSC must be the last
+ * item in the power-domain list.
+ */
+ camss->genpd = dev_pm_domain_attach_by_id(camss->dev,
+ camss->genpd_num - 1);
+ }
+ if (IS_ERR_OR_NULL(camss->genpd)) {
+ if (!camss->genpd)
+ ret = -ENODEV;
+ else
+ ret = PTR_ERR(camss->genpd);
goto fail_pm;
}
camss->genpd_link = device_link_add(camss->dev, camss->genpd,
diff --git a/drivers/media/platform/qcom/camss/camss.h
b/drivers/media/platform/qcom/camss/camss.h
index 1ba824a2cb76..cd8186fe1797 100644
--- a/drivers/media/platform/qcom/camss/camss.h
+++ b/drivers/media/platform/qcom/camss/camss.h
@@ -48,6 +48,7 @@ struct camss_subdev_resources {
u32 clock_rate[CAMSS_RES_MAX][CAMSS_RES_MAX];
char *reg[CAMSS_RES_MAX];
char *interrupt[CAMSS_RES_MAX];
+ char *pd_name;
u8 line_num;
bool has_pd;
const void *ops;
@@ -84,6 +85,7 @@ enum icc_count {
struct camss_resources {
enum camss_version version;
+ const char *pd_name;
const struct camss_subdev_resources *csiphy_res;
const struct camss_subdev_resources *csid_res;
const struct camss_subdev_resources *ispif_res;
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