soc: mediatek: Cleanup ifdefs for IS_REACHABLE(CONFIG_MTK_CMDQ)

Now that the mtk-cmdq.h header contains inline functions for cases
in which the driver is not enabled (either module or built-in), we
can safely go on with cleaning up ifdefs for CMDQ handling.

This also shows in a clearer manner that writing through CMDQ HW is
optional and used only for performance purposes when/where wanted,
needed and/or required.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230222094253.23678-10-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Author: AngeloGioacchino Del Regno

drivers/soc/mediatek/mtk-mmsys.c

@@ -131,21 +131,18 @@ struct mtk_mmsys {
 static void mtk_mmsys_update_bits(struct mtk_mmsys *mmsys, u32 offset, u32 mask, u32 val,
 				  struct cmdq_pkt *cmdq_pkt)
 {
+	int ret;
 	u32 tmp;
 
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
-	if (cmdq_pkt) {
-		if (mmsys->cmdq_base.size == 0) {
-			pr_err("mmsys lose gce property, failed to update mmsys bits with cmdq");
+	if (mmsys->cmdq_base.size && cmdq_pkt) {
+		ret = cmdq_pkt_write_mask(cmdq_pkt, mmsys->cmdq_base.subsys,
+					  mmsys->cmdq_base.offset + offset, val,
+					  mask);
+		if (ret)
+			pr_debug("CMDQ unavailable: using CPU write\n");
+		else
 			return;
-		}
-		cmdq_pkt_write_mask(cmdq_pkt, mmsys->cmdq_base.subsys,
-				    mmsys->cmdq_base.offset + offset, val,
-				    mask);
-		return;
 	}
-#endif
-
 	tmp = readl_relaxed(mmsys->regs + offset);
 	tmp = (tmp & ~mask) | (val & mask);
 	writel_relaxed(tmp, mmsys->regs + offset);
@@ -376,11 +373,10 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 		}
 	}
 
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	/* CMDQ is optional */
 	ret = cmdq_dev_get_client_reg(dev, &mmsys->cmdq_base, 0);
 	if (ret)
 		dev_dbg(dev, "No mediatek,gce-client-reg!\n");
-#endif
 
 	platform_set_drvdata(pdev, mmsys);
 

drivers/soc/mediatek/mtk-mutex.c

@@ -871,23 +871,18 @@ int mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex, void *pkt)
 {
 	struct mtk_mutex_ctx *mtx = container_of(mutex, struct mtk_mutex_ctx,
 						 mutex[mutex->id]);
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	struct cmdq_pkt *cmdq_pkt = (struct cmdq_pkt *)pkt;
 
 	WARN_ON(&mtx->mutex[mutex->id] != mutex);
 
 	if (!mtx->cmdq_reg.size) {
 		dev_err(mtx->dev, "mediatek,gce-client-reg hasn't been set");
-		return -EINVAL;
+		return -ENODEV;
 	}
 
 	cmdq_pkt_write(cmdq_pkt, mtx->cmdq_reg.subsys,
 		       mtx->addr + DISP_REG_MUTEX_EN(mutex->id), 1);
 	return 0;
-#else
-	dev_err(mtx->dev, "Not support for enable MUTEX by CMDQ");
-	return -ENODEV;
-#endif
 }
 EXPORT_SYMBOL_GPL(mtk_mutex_enable_by_cmdq);
 
@@ -1000,10 +995,7 @@ static int mtk_mutex_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct mtk_mutex_ctx *mtx;
 	struct resource *regs;
-	int i;
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
-	int ret;
-#endif
+	int i, ret;
 
 	mtx = devm_kzalloc(dev, sizeof(*mtx), GFP_KERNEL);
 	if (!mtx)
@@ -1030,11 +1022,10 @@ static int mtk_mutex_probe(struct platform_device *pdev)
 	}
 	mtx->addr = regs->start;
 
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	/* CMDQ is optional */
 	ret = cmdq_dev_get_client_reg(dev, &mtx->cmdq_reg, 0);
 	if (ret)
 		dev_dbg(dev, "No mediatek,gce-client-reg!\n");
-#endif
 
 	platform_set_drvdata(pdev, mtx);