[PATCH v3] drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS()

[Vitor Soares <ivitro@gmail.com>]

From: Vitor Soares <vitor.soares@toradex.com>

The deprecated UNIVERSAL_DEV_PM_OPS() macro uses the provided callbacks
for both runtime PM and system sleep. This causes the DSI clocks to be
disabled twice: once during runtime suspend and again during system
suspend, resulting in a WARN message from the clock framework when
attempting to disable already-disabled clocks.

[   84.384540] clk:231:5 already disabled
[   84.388314] WARNING: CPU: 2 PID: 531 at /drivers/clk/clk.c:1181 clk_core_disable+0xa4/0xac
...
[   84.579183] Call trace:
[   84.581624]  clk_core_disable+0xa4/0xac
[   84.585457]  clk_disable+0x30/0x4c
[   84.588857]  cdns_dsi_suspend+0x20/0x58 [cdns_dsi]
[   84.593651]  pm_generic_suspend+0x2c/0x44
[   84.597661]  ti_sci_pd_suspend+0xbc/0x15c
[   84.601670]  dpm_run_callback+0x8c/0x14c
[   84.605588]  __device_suspend+0x1a0/0x56c
[   84.609594]  dpm_suspend+0x17c/0x21c
[   84.613165]  dpm_suspend_start+0xa0/0xa8
[   84.617083]  suspend_devices_and_enter+0x12c/0x634
[   84.621872]  pm_suspend+0x1fc/0x368

To address this issue, replace UNIVERSAL_DEV_PM_OPS() with
SET_RUNTIME_PM_OPS(), enabling suspend/resume handling through the
_enable()/_disable() hooks managed by the DRM framework for both
runtime and system-wide PM.

Cc: <stable@vger.kernel.org> # 6.1.x
Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
Signed-off-by: Vitor Soares <vitor.soares@toradex.com>
---
v2 -> v3
 - Fix warning: 'cdns_dsi_suspend' defined but not used [-Wunused-function]
 - Fix warning: 'cdns_dsi_resume' defined but not used [-Wunused-function]

v1 -> v2
 - Rely only on SET_RUNTIME_PM_OPS() for the PM.

 drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index b022dd6e6b6e..6429d541889c 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -1258,7 +1258,7 @@ static const struct mipi_dsi_host_ops cdns_dsi_ops = {
 	.transfer = cdns_dsi_transfer,
 };
 
-static int __maybe_unused cdns_dsi_resume(struct device *dev)
+static int cdns_dsi_resume(struct device *dev)
 {
 	struct cdns_dsi *dsi = dev_get_drvdata(dev);
 
@@ -1269,7 +1269,7 @@ static int __maybe_unused cdns_dsi_resume(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused cdns_dsi_suspend(struct device *dev)
+static int cdns_dsi_suspend(struct device *dev)
 {
 	struct cdns_dsi *dsi = dev_get_drvdata(dev);
 
@@ -1279,8 +1279,9 @@ static int __maybe_unused cdns_dsi_suspend(struct device *dev)
 	return 0;
 }
 
-static UNIVERSAL_DEV_PM_OPS(cdns_dsi_pm_ops, cdns_dsi_suspend, cdns_dsi_resume,
-			    NULL);
+static const struct dev_pm_ops cdns_dsi_pm_ops = {
+	RUNTIME_PM_OPS(cdns_dsi_suspend, cdns_dsi_resume, NULL)
+};
 
 static int cdns_dsi_drm_probe(struct platform_device *pdev)
 {
@@ -1427,7 +1428,7 @@ static struct platform_driver cdns_dsi_platform_driver = {
 	.driver = {
 		.name   = "cdns-dsi",
 		.of_match_table = cdns_dsi_of_match,
-		.pm = &cdns_dsi_pm_ops,
+		.pm = pm_ptr(&cdns_dsi_pm_ops),
 	},
 };
 module_platform_driver(cdns_dsi_platform_driver);
-- 
2.34.1