drm/i2c: tda998x: handle all outstanding interrupts

As reading the interrupt registers clears the outstanding interrupts, we
must process all received interrupts to avoid dropping any.  Rearrange
the code to achieve this, and properly check for a HPD interrupt from
the CEC_RXSHPDINT register.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/gpu/drm/i2c/tda998x_drv.c

@@ -330,6 +330,8 @@ struct tda998x_priv {
 # define CEC_FRO_IM_CLK_CTRL_FRO_DIV   (1 << 0)
 #define REG_CEC_RXSHPDINTENA	  0xfc		      /* read/write */
 #define REG_CEC_RXSHPDINT	  0xfd		      /* read */
+# define CEC_RXSHPDINT_RXSENS     BIT(0)
+# define CEC_RXSHPDINT_HPD        BIT(1)
 #define REG_CEC_RXSHPDLEV         0xfe                /* read */
 # define CEC_RXSHPDLEV_RXSENS     (1 << 0)
 # define CEC_RXSHPDLEV_HPD        (1 << 1)
@@ -619,11 +621,8 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 	DRM_DEBUG_DRIVER(
 		"tda irq sta %02x cec %02x lvl %02x f0 %02x f1 %02x f2 %02x\n",
 		sta, cec, lvl, flag0, flag1, flag2);
-	if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
-		priv->wq_edid_wait = 0;
-		wake_up(&priv->wq_edid);
-		handled = true;
-	} else if (cec != 0) {			/* HPD change */
+
+	if (cec & CEC_RXSHPDINT_HPD) {
 		if (lvl & CEC_RXSHPDLEV_HPD)
 			tda998x_edid_delay_start(priv);
 		else
@@ -631,6 +630,13 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 
 		handled = true;
 	}
+
+	if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
+		priv->wq_edid_wait = 0;
+		wake_up(&priv->wq_edid);
+		handled = true;
+	}
+
 	return IRQ_RETVAL(handled);
 }