[PATCH v1 7/7] drm/bridge: analogix_dp: Skip native HPD interrupt ops for GPIO HPD

[Damon Ding]

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

Configure interrupt routine mutes native HPD interrupts when
dp->hpd_gpiod exists. Add identical condition guards in hardirq and
threaded irq handlers. Drop redundant dp->hpd_gpiod condition inside
analogix_dp_clear_hotplug_interrupts().

Signed-off-by: Damon Ding <damon.ding at rock-chips.com>
---
 .../drm/bridge/analogix/analogix_dp_core.c    |  5 +--
 .../gpu/drm/bridge/analogix/analogix_dp_reg.c | 32 +++++++++++--------
 2 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index a292bc881b6b..91fa7569950a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -708,7 +708,8 @@ static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
 
 	irq_type = analogix_dp_get_irq_type(dp);
 	if (irq_type) {
-		analogix_dp_mute_hpd_interrupt(dp, irq_type);
+		if (!dp->hpd_gpiod)
+			analogix_dp_mute_hpd_interrupt(dp, irq_type);
 		ret = IRQ_WAKE_THREAD;
 	}
 
@@ -733,7 +734,7 @@ static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
 			drm_helper_hpd_irq_event(dp->drm_dev);
 	}
 
-	if (irq_type) {
+	if (!dp->hpd_gpiod && irq_type) {
 		analogix_dp_clear_hotplug_interrupts(dp, irq_type);
 		analogix_dp_unmute_hpd_interrupt(dp, irq_type);
 	}
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 981ce3810e90..cf1f9216c742 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -177,20 +177,24 @@ 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);
 
-	if (analogix_dp_is_rockchip(dp->plat_data->dev_type)) {
-		/*
-		 * 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.
-		 */
-		writel(0x80, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_L);
-		writel(0xbb, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_H);
-		analogix_dp_unmute_hpd_interrupt(dp, DP_IRQ_TYPE_HP_CHANGE);
+	if (dp->hpd_gpiod) {
+		analogix_dp_mute_hpd_interrupt(dp, HPD_IRQ);
 	} else {
-		analogix_dp_unmute_hpd_interrupt(dp, HPD_IRQ);
+		if (analogix_dp_is_rockchip(dp->plat_data->dev_type)) {
+			/*
+			 * 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.
+			 */
+			writel(0x80, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_L);
+			writel(0xbb, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_H);
+			analogix_dp_unmute_hpd_interrupt(dp, DP_IRQ_TYPE_HP_CHANGE);
+		} else {
+			analogix_dp_unmute_hpd_interrupt(dp, HPD_IRQ);
+		}
 	}
 }
 
@@ -411,7 +415,7 @@ 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