[PATCH v3 6/7] drm/mediatek: Add programming flow for unsupported subsys ID hardware

["Jason-JH.Lin" <jason-jh.lin@xxxxxxxxxxxx>]

To support hardware without subsys IDs on new SoCs, add a programming
flow that checks whether the subsys ID is valid. If the subsys ID is
invalid, the flow will call 2 alternative CMDQ APIs:
cmdq_pkt_assign() and cmdq_pkt_write_s_value() to achieve the same
functionality.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 33 ++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index edc6417639e6..219d67735a54 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -66,14 +66,37 @@ struct mtk_ddp_comp_dev {
 	struct cmdq_client_reg cmdq_reg;
 };
 
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+static void mtk_ddp_write_cmdq_pkt(struct cmdq_pkt *cmdq_pkt, struct cmdq_client_reg *cmdq_reg,
+				   unsigned int offset, unsigned int value, unsigned int mask)
+{
+	offset += cmdq_reg->offset;
+
+	if (cmdq_reg->subsys != CMDQ_SUBSYS_INVALID) {
+		if (mask == GENMASK(31, 0))
+			cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys, offset, value);
+		else
+			cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys, offset, value, mask);
+	} else {
+		/* only MMIO access, no need to check mminfro_offset */
+		cmdq_pkt_assign(cmdq_pkt, 0, CMDQ_ADDR_HIGH(cmdq_reg->pa_base));
+		if (mask == GENMASK(31, 0))
+			cmdq_pkt_write_s_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
+					       CMDQ_ADDR_LOW(offset), value);
+		else
+			cmdq_pkt_write_s_mask_value(cmdq_pkt, CMDQ_THR_SPR_IDX0,
+						    CMDQ_ADDR_LOW(offset), value, mask);
+	}
+}
+#endif
+
 void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 		   struct cmdq_client_reg *cmdq_reg, void __iomem *regs,
 		   unsigned int offset)
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt)
-		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
-			       cmdq_reg->offset + offset, value);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
 	else
 #endif
 		writel(value, regs + offset);
@@ -85,8 +108,7 @@ void mtk_ddp_write_relaxed(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt)
-		cmdq_pkt_write(cmdq_pkt, cmdq_reg->subsys,
-			       cmdq_reg->offset + offset, value);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, GENMASK(31, 0));
 	else
 #endif
 		writel_relaxed(value, regs + offset);
@@ -98,8 +120,7 @@ void mtk_ddp_write_mask(struct cmdq_pkt *cmdq_pkt, unsigned int value,
 {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (cmdq_pkt) {
-		cmdq_pkt_write_mask(cmdq_pkt, cmdq_reg->subsys,
-				    cmdq_reg->offset + offset, value, mask);
+		mtk_ddp_write_cmdq_pkt(cmdq_pkt, cmdq_reg, offset, value, mask);
 	} else {
 #endif
 		u32 tmp = readl(regs + offset);
-- 
2.43.0