8033-brcmfmac-common-Add-support-for-external-calibration.patch

From f92aef8679038a4d0b055babf368f8f43bdd072b Mon Sep 17 00:00:00 2001
From: Hector Martin <marcan@marcan.st>
Date: Sun, 26 Dec 2021 00:53:37 +0900
Subject: [PATCH 34/34] brcmfmac: common: Add support for external calibration
 blobs

The calibration blob for a chip is normally stored in SROM and loaded
internally by the firmware. However, Apple ARM64 platforms instead store
it as part of platform configuration data, and provide it via the Apple
Device Tree. We forward this into the Linux DT in the bootloader.

Add support for taking this blob from the DT and loading it into the
dongle. The loading mechanism is the same as used for the CLM and TxCap
blobs.

Signed-off-by: Hector Martin <marcan@marcan.st>
---
 .../broadcom/brcm80211/brcmfmac/common.c      | 24 +++++++++++++++++++
 .../broadcom/brcm80211/brcmfmac/common.h      |  2 ++
 .../wireless/broadcom/brcm80211/brcmfmac/of.c |  9 +++++++
 3 files changed, 35 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
index d65308c3f..ad36e6b5d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
@@ -218,6 +218,23 @@ static int brcmf_c_process_txcap_blob(struct brcmf_if *ifp)
 	return err;
 }
 
+static int brcmf_c_process_cal_blob(struct brcmf_if *ifp)
+{
+	struct brcmf_pub *drvr = ifp->drvr;
+	struct brcmf_mp_device *settings = drvr->settings;
+	s32 err;
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	if (!settings->cal_blob || !settings->cal_size)
+		return 0;
+
+	brcmf_info("Calibration blob provided by platform, loading\n");
+	err = brcmf_c_download_blob(ifp, settings->cal_blob, settings->cal_size,
+				    "calload", "calload_status");
+	return err;
+}
+
 int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 {
 	struct brcmf_pub *drvr = ifp->drvr;
@@ -291,6 +308,13 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 		goto done;
 	}
 
+	/* Download external calibration blob, if available */
+	err = brcmf_c_process_cal_blob(ifp);
+	if (err < 0) {
+		bphy_err(drvr, "download calibration blob file failed, %d\n", err);
+		goto done;
+	}
+
 	/* query for 'ver' to get version info from firmware */
 	memset(buf, 0, sizeof(buf));
 	err = brcmf_fil_iovar_data_get(ifp, "ver", buf, sizeof(buf));
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
index a88c4a931..f321346ed 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
@@ -51,6 +51,8 @@ struct brcmf_mp_device {
 	struct brcmfmac_pd_cc *country_codes;
 	const char	*board_type;
 	const char	*antenna_sku;
+	void		*cal_blob;
+	int		cal_size;
 	union {
 		struct brcmfmac_sdio_pd sdio;
 	} bus;
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index 31407d3a1..9db5fa106 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -86,6 +86,15 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	if (!of_property_read_string(np, "apple,antenna-sku", &prop))
 		settings->antenna_sku = devm_kstrdup(dev, prop, GFP_KERNEL);
 
+	/*
+	 * The WLAN calibration blob is normally stored in SROM, but Apple
+	 * ARM64 platforms pass it via the DT instead.
+	 */
+	prop = of_get_property(np, "brcm,cal-blob", &settings->cal_size);
+	if (prop && settings->cal_size)
+		settings->cal_blob = devm_kmemdup(dev, prop, settings->cal_size,
+						  GFP_KERNEL);
+
 	/* Set board-type to the first string of the machine compatible prop */
 	root = of_find_node_by_path("/");
 	if (root && !settings->board_type) {
-- 
2.25.1