drm/tegra: gr3d: Convert into devm_pm_domain_attach_list()

Rather than hooking up the PM domains through devm_pm_opp_attach_genpd()
and manage the device-link, let's avoid the boilerplate-code by converting
into devm_pm_domain_attach_list().

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20241002122232.194245-9-ulf.hansson@linaro.org

diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index 00c8564..caee824 100644 (file)
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -46,6 +46,7 @@ struct gr3d {
        unsigned int nclocks;
        struct reset_control_bulk_data resets[RST_GR3D_MAX];
        unsigned int nresets;
+       struct dev_pm_domain_list *pd_list;
 
        DECLARE_BITMAP(addr_regs, GR3D_NUM_REGS);
 };
@@ -369,18 +370,13 @@ static int gr3d_power_up_legacy_domain(struct device *dev, const char *name,
        return 0;
 }
 
-static void gr3d_del_link(void *link)
-{
-       device_link_del(link);
-}
-
 static int gr3d_init_power(struct device *dev, struct gr3d *gr3d)
 {
-       static const char * const opp_genpd_names[] = { "3d0", "3d1", NULL };
-       const u32 link_flags = DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME;
-       struct device **opp_virt_devs, *pd_dev;
-       struct device_link *link;
-       unsigned int i;
+       struct dev_pm_domain_attach_data pd_data = {
+               .pd_names = (const char *[]) { "3d0", "3d1" },
+               .num_pd_names = 2,
+               .pd_flags = PD_FLAG_REQUIRED_OPP,
+       };
        int err;
 
        err = of_count_phandle_with_args(dev->of_node, "power-domains",
@@ -414,29 +410,10 @@ static int gr3d_init_power(struct device *dev, struct gr3d *gr3d)
        if (dev->pm_domain)
                return 0;
 
-       err = devm_pm_opp_attach_genpd(dev, opp_genpd_names, &opp_virt_devs);
-       if (err)
+       err = devm_pm_domain_attach_list(dev, &pd_data, &gr3d->pd_list);
+       if (err < 0)
                return err;
 
-       for (i = 0; opp_genpd_names[i]; i++) {
-               pd_dev = opp_virt_devs[i];
-               if (!pd_dev) {
-                       dev_err(dev, "failed to get %s power domain\n",
-                               opp_genpd_names[i]);
-                       return -EINVAL;
-               }
-
-               link = device_link_add(dev, pd_dev, link_flags);
-               if (!link) {
-                       dev_err(dev, "failed to link to %s\n", dev_name(pd_dev));
-                       return -EINVAL;
-               }
-
-               err = devm_add_action_or_reset(dev, gr3d_del_link, link);
-               if (err)
-                       return err;
-       }
-
        return 0;
 }