[PATCH v2 15/17] crypto: qce: Defer probing if BAM dma is not yet initialized

[Bhupesh Sharma]

Since the Qualcomm qce crypto driver needs the BAM dma driver to be
setup first (to allow crypto operations), it makes sense to defer
the qce crypto driver probing in case the BAM dma driver is not yet
probed.

This fixes the qce probe failure issues when both qce and BMA dma
are compiled as static part of the kernel.

Cc: Thara Gopinath <thara.gopinath@xxxxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Andy Gross <agross@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Cc: Michael Turquette <mturquette@xxxxxxxxxxxx>
Cc: Vinod Koul <vkoul@xxxxxxxxxx>
Cc: dmaengine@xxxxxxxxxxxxxxx
Cc: linux-clk@xxxxxxxxxxxxxxx
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: bhupesh.linux@xxxxxxxxx
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx>
---
 drivers/crypto/qce/core.c  | 4 ++++
 drivers/dma/qcom/bam_dma.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
index 9a7d7ef94687..3e742e9911fa 100644
--- a/drivers/crypto/qce/core.c
+++ b/drivers/crypto/qce/core.c
@@ -15,6 +15,7 @@
 #include <linux/types.h>
 #include <crypto/algapi.h>
 #include <crypto/internal/hash.h>
+#include <soc/qcom/bam_dma.h>
 
 #include "core.h"
 #include "cipher.h"
@@ -201,6 +202,9 @@ static int qce_crypto_probe(struct platform_device *pdev)
 			of_match_device(qce_crypto_of_match, &pdev->dev);
 	int ret;
 
+	/* qce driver requires BAM dma driver to be setup first */
+	if (!bam_is_probed())
+		return -EPROBE_DEFER;
 
 	qce = devm_kzalloc(dev, sizeof(*qce), GFP_KERNEL);
 	if (!qce)
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 2bc3b7c7ee5a..c854fcc82dbf 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -935,6 +935,12 @@ static void bam_channel_init(struct bam_device *bdev, struct bam_chan *bchan,
 	INIT_LIST_HEAD(&bchan->desc_list);
 }
 
+bool bam_is_probed(void)
+{
+	return bam_probed;
+}
+EXPORT_SYMBOL_GPL(bam_is_probed);
+
 static const struct of_device_id bam_of_match[] = {
 	{ .compatible = "qcom,bam-v1.3.0", .data = &bam_v1_3_reg_info },
 	{ .compatible = "qcom,bam-v1.4.0", .data = &bam_v1_4_reg_info },
@@ -1084,6 +1090,7 @@ static int bam_dma_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_unregister_dma;
 
+	bam_probed = true;
 	if (!bdev->bamclk) {
 		pm_runtime_disable(&pdev->dev);
 		return 0;
-- 
2.30.2