[PATCH v2 08/10] drm/bridge: analogix_dp: Skip native HPD interrupt ops for GPIO HPD

GPIO HPD does not rely on DP controller internal native HPD interrupts.
Skip native HPD register manipulations to avoid irrelevant operations.

In analogix_dp_config_interrupt(), mute all native HPD interrupts when
dp->hpd_gpiod is set. Move the dp->hpd_gpiod guard from inside
analogix_dp_clear_hotplug_interrupts() to its caller in the threaded
IRQ handler, so that the function operates purely on the given irq_type
bitmask without implicit mode-dependent behavior. This makes it
reusable for future callers that may need to clear specific interrupt
status bits regardless of the HPD detection mode.

Signed-off-by: Damon Ding <[email protected]>

---

Changes in v2:
- Adapt to the newly added IRQF_ONESHOT related commit and expand the
  commit msg.
---
 .../drm/bridge/analogix/analogix_dp_core.c    |  2 +-
 .../gpu/drm/bridge/analogix/analogix_dp_reg.c | 30 +++++++++++--------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index d207cc864bdc..f05db455b430 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -720,7 +720,7 @@ static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
 	bool hpd_detected;
 
 	irq_type = analogix_dp_get_irq_type(dp);
-	if (irq_type)
+	if (!dp->hpd_gpiod && irq_type)
 		analogix_dp_clear_hotplug_interrupts(dp, irq_type);
 
 	if (!dp->hpd_gpiod && analogix_dp_is_rockchip(dp->plat_data->dev_type))
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index fa8e2f104d6c..4b210e685747 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -182,18 +182,22 @@ void analogix_dp_config_interrupt(struct analogix_dp_device *dp)
 	writel(0, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_2);
 	writel(0, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_3);
 
-	/*
-	 * Either HOTPLUG_CHG interrupt or PLUG + HPD_LOST interrupt
-	 * pair can be used to implement hotplug detection.
-	 *
-	 * On Rockchip platforms, configuring HPD deglitch to 2ms and
-	 * using HOTPLUG_CHG interrupt for hotplug detection is proven
-	 * as a better solution via engineering verification.
-	 */
-	if (analogix_dp_is_rockchip(dp->plat_data->dev_type))
-		analogix_dp_unmute_hpd_interrupt(dp, DP_IRQ_TYPE_HP_CHANGE);
-	else
-		analogix_dp_unmute_hpd_interrupt(dp, HPD_IRQ);
+	if (dp->hpd_gpiod) {
+		analogix_dp_mute_hpd_interrupt(dp, HPD_IRQ);
+	} else {
+		/*
+		 * Either HOTPLUG_CHG interrupt or PLUG + HPD_LOST interrupt
+		 * pair can be used to implement hotplug detection.
+		 *
+		 * On Rockchip platforms, configuring HPD deglitch to 2ms and
+		 * using HOTPLUG_CHG interrupt for hotplug detection is proven
+		 * as a better solution via engineering verification.
+		 */
+		if (analogix_dp_is_rockchip(dp->plat_data->dev_type))
+			analogix_dp_unmute_hpd_interrupt(dp, DP_IRQ_TYPE_HP_CHANGE);
+		else
+			analogix_dp_unmute_hpd_interrupt(dp, HPD_IRQ);
+	}
 }
 
 void analogix_dp_mute_hpd_interrupt(struct analogix_dp_device *dp, u32 irq_type)
@@ -413,7 +417,7 @@ void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp, u32 irq
 {
 	u32 reg = 0;
 
-	if (dp->hpd_gpiod || !irq_type)
+	if (!irq_type)
 		return;
 
 	if (irq_type & COMMON_INT_4_HPD_IRQ) {
-- 
2.34.1