drm/msm/dpu: autodetect supported interrupts

Declaring the mask of supported interrupts proved to be error-prone. It
is very easy to add a bit with no corresponding backing block or to miss
the INTF TE bit. Replace this with looping over the enabled INTF blocks
to setup the irq mask.
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/549654/
Link: https://lore.kernel.org/r/20230727144543.1483630-4-dmitry.baryshkov@linaro.org

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c

@@ -463,6 +463,7 @@ struct dpu_hw_intr *dpu_hw_intr_init(void __iomem *addr,
 {
 	struct dpu_hw_intr *intr;
 	int nirq = MDP_INTR_MAX * 32;
+	unsigned int i;
 
 	if (!addr || !m)
 		return ERR_PTR(-EINVAL);
@@ -480,7 +481,20 @@ struct dpu_hw_intr *dpu_hw_intr_init(void __iomem *addr,
 
 	intr->total_irqs = nirq;
 
-	intr->irq_mask = m->mdss_irqs;
+	intr->irq_mask = BIT(MDP_SSPP_TOP0_INTR) |
+			 BIT(MDP_SSPP_TOP0_INTR2) |
+			 BIT(MDP_SSPP_TOP0_HIST_INTR);
+	for (i = 0; i < m->intf_count; i++) {
+		const struct dpu_intf_cfg *intf = &m->intf[i];
+
+		if (intf->type == INTF_NONE)
+			continue;
+
+		intr->irq_mask |= BIT(MDP_INTFn_INTR(intf->id));
+
+		if (intf->intr_tear_rd_ptr != -1)
+			intr->irq_mask |= BIT(DPU_IRQ_REG(intf->intr_tear_rd_ptr));
+	}
 
 	spin_lock_init(&intr->irq_lock);
 

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h

@@ -17,6 +17,7 @@ enum dpu_hw_intr_reg {
 	MDP_SSPP_TOP0_INTR,
 	MDP_SSPP_TOP0_INTR2,
 	MDP_SSPP_TOP0_HIST_INTR,
+	/* All MDP_INTFn_INTR should come sequentially */
 	MDP_INTF0_INTR,
 	MDP_INTF1_INTR,
 	MDP_INTF2_INTR,
@@ -33,6 +34,8 @@ enum dpu_hw_intr_reg {
 	MDP_INTR_MAX,
 };
 
+#define MDP_INTFn_INTR(intf)	(MDP_INTF0_INTR + (intf - INTF_0))
+
 /* compatibility */
 #define MDP_INTF0_7xxx_INTR MDP_INTF0_INTR
 #define MDP_INTF1_7xxx_INTR MDP_INTF1_INTR