linux-kernel - [PATCH v2 5/5] usb: xhci: allow multiple firmware versions

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Message-Id: <20190621085913.8722-6-vkoul@kernel.org>
Date:   Fri, 21 Jun 2019 14:29:13 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Christian Lamparter <chunkeey@...glemail.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] usb: xhci: allow multiple firmware versions

Allow multiple firmware file versions in table and load them in
increasing order as we find them in the file system.

Signed-off-by: Vinod Koul <vkoul@...nel.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: Christian Lamparter <chunkeey@...glemail.com>
---
 drivers/usb/host/xhci-pci.c | 46 +++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 771948ce3d38..1fb890984d6d 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -336,13 +336,19 @@ static const struct renesas_fw_entry {
 	 *  - uPD720201 ES 2.0 sample whose revision ID is 2.
 	 *  - uPD720201 ES 2.1 sample & CS sample & Mass product, ID is 3.
 	 *  - uPD720202 ES 2.0 sample & CS sample & Mass product, ID is 2.
+	 *
+	 *  Entry expected_version should be kept in increasing order for a
+	 *  chip, so that driver will pick first version and if that fails
+	 *  then next one will be picked
 	 */
 	{ "K2013080.mem", 0x0014, 0x02, 0x2013 },
 	{ "K2013080.mem", 0x0014, 0x03, 0x2013 },
+	{ "K2026090.mem", 0x0014, 0x03, 0x2026 },
 	{ "K2013080.mem", 0x0015, 0x02, 0x2013 },
 };
 
 MODULE_FIRMWARE("K2013080.mem");
+MODULE_FIRMWARE("K2026090.mem");
 
 static const struct renesas_fw_entry *renesas_needs_fw_dl(struct pci_dev *dev)
 {
@@ -363,6 +369,24 @@ static const struct renesas_fw_entry *renesas_needs_fw_dl(struct pci_dev *dev)
 	return NULL;
 }
 
+static const struct
+renesas_fw_entry *renesas_get_next_entry(struct pci_dev *dev,
+					 const struct renesas_fw_entry *entry)
+{
+	const struct renesas_fw_entry *next_entry;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(renesas_fw_table); i++) {
+		next_entry = &renesas_fw_table[i];
+		if (next_entry->device == dev->device &&
+		    next_entry->revision == dev->revision &&
+		    next_entry->expected_version > entry->expected_version)
+			return next_entry;
+	}
+
+	return NULL;
+}
+
 static int renesas_fw_download_image(struct pci_dev *dev,
 				     const u32 *fw,
 				     size_t step)
@@ -709,6 +733,7 @@ struct renesas_fw_ctx {
 	struct pci_dev *pdev;
 	const struct pci_device_id *id;
 	bool resume;
+	const struct renesas_fw_entry *entry;
 };
 
 static int xhci_pci_probe(struct pci_dev *pdev,
@@ -968,13 +993,29 @@ static void renesas_fw_callback(const struct firmware *fw,
 	struct renesas_fw_ctx *ctx = context;
 	struct pci_dev *pdev = ctx->pdev;
 	struct device *parent = pdev->dev.parent;
+	const struct renesas_fw_entry *next_entry;
 	bool rom;
 	int err;
 
 	if (!fw) {
 		dev_err(&pdev->dev, "firmware failed to load\n");
-
-		goto cleanup;
+		/*
+		 * we didn't find firmware, check if we have another
+		 * entry for this device
+		 */
+		next_entry = renesas_get_next_entry(ctx->pdev, ctx->entry);
+		if (next_entry) {
+			ctx->entry = next_entry;
+			dev_dbg(&pdev->dev, "Found next entry, requesting: %s\n",
+				next_entry->firmware_name);
+			request_firmware_nowait(THIS_MODULE, 1,
+						next_entry->firmware_name,
+						&pdev->dev, GFP_KERNEL,
+						ctx, renesas_fw_callback);
+			return;
+		} else {
+			goto cleanup;
+		}
 	}
 
 	err = renesas_fw_verify(pdev, fw->data, fw->size);
@@ -1072,6 +1113,7 @@ static int renesas_fw_download_to_hw(struct pci_dev *pdev,
 	ctx->pdev = pdev;
 	ctx->resume = do_resume;
 	ctx->id = id;
+	ctx->entry = entry;
 
 	pci_dev_get(pdev);
 	err = request_firmware_nowait(THIS_MODULE, 1, entry->firmware_name,
-- 
2.20.1