Revert "ath11k: add read variant from SMBIOS for download board data"

This reverts commit 46e46db3. Mark reported
that it breaks QCA6390 hw2.0 on Dell XPS 13 9310:

[    5.537034] ath11k_pci 0000:72:00.0: chip_id 0x0 chip_family 0xb board_id 0xff soc_id 0xffffffff
[    5.537038] ath11k_pci 0000:72:00.0: fw_version 0x101c06cc fw_build_timestamp 2020-06-24 19:50 fw_build_id
[    5.537236] ath11k_pci 0000:72:00.0: failed to fetch board data for bus=pci,qmi-chip-id=0,qmi-board-id=255,variant=DE_1901 from ath11k/QCA6390/hw2.0/board-2.bin
[    5.537255] ath11k_pci 0000:72:00.0: failed to fetch board-2.bin or board.bin from QCA6390/hw2.0
[    5.537257] ath11k_pci 0000:72:00.0: qmi failed to fetch board file: -2
[    5.537258] ath11k_pci 0000:72:00.0: failed to load board data file: -2

So we need to back to the drawing board and implement it so that backwards
compatiblity is not broken.
Reported-by: Mark Herbert <mark.herbert42@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211124094316.9096-1-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/core.c

@@ -8,9 +8,6 @@
 #include <linux/remoteproc.h>
 #include <linux/firmware.h>
 #include <linux/of.h>
-#include <linux/dmi.h>
-#include <linux/ctype.h>
-
 #include "core.h"
 #include "dp_tx.h"
 #include "dp_rx.h"
@@ -387,82 +384,6 @@ int ath11k_core_resume(struct ath11k_base *ab)
 }
 EXPORT_SYMBOL(ath11k_core_resume);
 
-static void ath11k_core_check_bdfext(const struct dmi_header *hdr, void *data)
-{
-	struct ath11k_base *ab = data;
-	const char *bdf_ext;
-	const char *magic = ATH11K_SMBIOS_BDF_EXT_MAGIC;
-	u8 bdf_enabled;
-	int i;
-	size_t len;
-
-	if (ab->qmi.target.bdf_ext[0] != '\0')
-		return;
-
-	if (hdr->type != ATH11K_SMBIOS_BDF_EXT_TYPE)
-		return;
-
-	if (hdr->length != ATH11K_SMBIOS_BDF_EXT_LENGTH) {
-		ath11k_dbg(ab, ATH11K_DBG_BOOT,
-			   "wrong smbios bdf ext type length (%d).\n",
-			   hdr->length);
-		return;
-	}
-
-	bdf_enabled = *((u8 *)hdr + ATH11K_SMBIOS_BDF_EXT_OFFSET);
-	if (!bdf_enabled) {
-		ath11k_dbg(ab, ATH11K_DBG_BOOT, "bdf variant name not found.\n");
-		return;
-	}
-
-	/* Only one string exists (per spec) */
-	bdf_ext = (char *)hdr + hdr->length;
-
-	if (memcmp(bdf_ext, magic, strlen(magic)) != 0) {
-		ath11k_dbg(ab, ATH11K_DBG_BOOT,
-			   "bdf variant magic does not match.\n");
-		return;
-	}
-
-	len = strlen(bdf_ext);
-	for (i = 0; i < len; i++) {
-		if (!isascii(bdf_ext[i]) || !isprint(bdf_ext[i])) {
-			ath11k_dbg(ab, ATH11K_DBG_BOOT,
-				   "bdf variant name contains non ascii chars.\n");
-			return;
-		}
-	}
-
-	/* Copy extension name without magic prefix */
-	if (strscpy(ab->qmi.target.bdf_ext, bdf_ext + strlen(magic),
-		    sizeof(ab->qmi.target.bdf_ext)) < 0) {
-		ath11k_dbg(ab, ATH11K_DBG_BOOT,
-			   "bdf variant string is longer than the buffer can accommodate (variant: %s)\n",
-			    bdf_ext);
-		return;
-	}
-
-	ath11k_dbg(ab, ATH11K_DBG_BOOT,
-		   "found and validated bdf variant smbios_type 0x%x bdf %s\n",
-		   ATH11K_SMBIOS_BDF_EXT_TYPE, bdf_ext);
-}
-
-int ath11k_core_check_smbios(struct ath11k_base *ab)
-{
-	int ret;
-
-	ab->qmi.target.bdf_ext[0] = '\0';
-
-	ret = dmi_walk(ath11k_core_check_bdfext, ab);
-	if (ret)
-		return ret;
-
-	if (ab->qmi.target.bdf_ext[0] == '\0')
-		return -ENODATA;
-
-	return 0;
-}
-
 int ath11k_core_check_dt(struct ath11k_base *ab)
 {
 	size_t max_len = sizeof(ab->qmi.target.bdf_ext);

drivers/net/wireless/ath/ath11k/core.h

@@ -938,18 +938,6 @@ struct ath11k_fw_stats_bcn {
 	u32 tx_bcn_outage_cnt;
 };
 
-/* SMBIOS type containing Board Data File Name Extension */
-#define ATH11K_SMBIOS_BDF_EXT_TYPE 0xF8
-
-/* SMBIOS type structure length (excluding strings-set) */
-#define ATH11K_SMBIOS_BDF_EXT_LENGTH 0x9
-
-/* Offset pointing to Board Data File Name Extension */
-#define ATH11K_SMBIOS_BDF_EXT_OFFSET 0x8
-
-/* The magic used by QCA spec */
-#define ATH11K_SMBIOS_BDF_EXT_MAGIC "BDF_"
-
 extern const struct ce_pipe_config ath11k_target_ce_config_wlan_ipq8074[];
 extern const struct service_to_pipe ath11k_target_service_to_ce_map_wlan_ipq8074[];
 extern const struct service_to_pipe ath11k_target_service_to_ce_map_wlan_ipq6018[];
@@ -971,7 +959,6 @@ int ath11k_core_fetch_bdf(struct ath11k_base *ath11k,
 			  struct ath11k_board_data *bd);
 void ath11k_core_free_bdf(struct ath11k_base *ab, struct ath11k_board_data *bd);
 int ath11k_core_check_dt(struct ath11k_base *ath11k);
-int ath11k_core_check_smbios(struct ath11k_base *ab);
 
 void ath11k_core_halt(struct ath11k *ar);
 int ath11k_core_resume(struct ath11k_base *ab);

drivers/net/wireless/ath/ath11k/qmi.c

@@ -1991,10 +1991,6 @@ static int ath11k_qmi_request_target_cap(struct ath11k_base *ab)
 		    ab->qmi.target.fw_build_timestamp,
 		    ab->qmi.target.fw_build_id);
 
-	r = ath11k_core_check_smbios(ab);
-	if (r)
-		ath11k_dbg(ab, ATH11K_DBG_QMI, "SMBIOS bdf variant name not set.\n");
-
 	r = ath11k_core_check_dt(ab);
 	if (r)
 		ath11k_dbg(ab, ATH11K_DBG_QMI, "DT bdf variant name not set.\n");