ath11k: Refactor spectral FFT bin size

In IPQ8074, actual FFT bin size is two bytes but hardware reports it
with extra pad size of two bytes for each FFT bin. So finally each FFT
bin advertise as four bytes size in the collected data. This FFT pad is
not advertised in IPQ6018 platform. To accommodate this different
behavior across the platforms, introduce the hw param fft_pad_sz and use
it in spectral process. Also group all the spectral params under the new
structure in hw param structure for scalable in future.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01492-QCAHKSWPL_SILICONZ-1
Tested-on: IPQ6018 hw1.0 AHB WLAN.HK.2.4.0.1-00330-QCAHKSWPL_SILICONZ-1
Signed-off-by: Karthikeyan Periyasamy <periyasa@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210721180809.90960-2-jouni@codeaurora.org

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

@@ -59,7 +59,14 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.vdev_start_delay = false,
 		.htt_peer_map_v2 = true,
 		.tcl_0_only = false,
-		.spectral_fft_sz = 2,
+
+		.spectral = {
+			.fft_sz = 2,
+			/* HW bug, expected BIN size is 2 bytes but HW report as 4 bytes.
+			 * so added pad size as 2 bytes to compensate the BIN size
+			 */
+			.fft_pad_sz = 2,
+		},
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP) |
@@ -100,7 +107,11 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.vdev_start_delay = false,
 		.htt_peer_map_v2 = true,
 		.tcl_0_only = false,
-		.spectral_fft_sz = 4,
+
+		.spectral = {
+			.fft_sz = 4,
+			.fft_pad_sz = 0,
+		},
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP) |
@@ -141,7 +152,11 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.vdev_start_delay = true,
 		.htt_peer_map_v2 = false,
 		.tcl_0_only = true,
-		.spectral_fft_sz = 0,
+
+		.spectral = {
+			.fft_sz = 0,
+			.fft_pad_sz = 0,
+		},
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP),
@@ -180,6 +195,12 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.vdev_start_delay = false,
 		.htt_peer_map_v2 = true,
 		.tcl_0_only = false,
+
+		.spectral = {
+			.fft_sz = 0,
+			.fft_pad_sz = 0,
+		},
+
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP) |
 					BIT(NL80211_IFTYPE_MESH_POINT),
@@ -219,7 +240,11 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.vdev_start_delay = true,
 		.htt_peer_map_v2 = false,
 		.tcl_0_only = true,
-		.spectral_fft_sz = 0,
+
+		.spectral = {
+			.fft_sz = 0,
+			.fft_pad_sz = 0,
+		},
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP),

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

@@ -153,7 +153,11 @@ struct ath11k_hw_params {
 	bool vdev_start_delay;
 	bool htt_peer_map_v2;
 	bool tcl_0_only;
-	u8 spectral_fft_sz;
+
+	struct {
+		u8 fft_sz;
+		u8 fft_pad_sz;
+	} spectral;
 
 	u16 interface_modes;
 	bool supports_monitor;

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

@@ -11,8 +11,6 @@
 #define ATH11K_SPECTRAL_EVENT_TIMEOUT_MS	1
 
 #define ATH11K_SPECTRAL_DWORD_SIZE		4
-/* HW bug, expected BIN size is 2 bytes but HW report as 4 bytes */
-#define ATH11K_SPECTRAL_BIN_SIZE		4
 #define ATH11K_SPECTRAL_ATH11K_MIN_BINS		64
 #define ATH11K_SPECTRAL_ATH11K_MIN_IB_BINS	32
 #define ATH11K_SPECTRAL_ATH11K_MAX_IB_BINS	256
@@ -581,12 +579,12 @@ int ath11k_spectral_process_fft(struct ath11k *ar,
 	struct spectral_tlv *tlv;
 	int tlv_len, bin_len, num_bins;
 	u16 length, freq;
-	u8 chan_width_mhz;
+	u8 chan_width_mhz, bin_sz;
 	int ret;
 
 	lockdep_assert_held(&ar->spectral.lock);
 
-	if (!ab->hw_params.spectral_fft_sz) {
+	if (!ab->hw_params.spectral.fft_sz) {
 		ath11k_warn(ab, "invalid bin size type for hw rev %d\n",
 			    ab->hw_rev);
 		return -EINVAL;
@@ -604,7 +602,8 @@ int ath11k_spectral_process_fft(struct ath11k *ar,
 		return -EINVAL;
 	}
 
-	num_bins = bin_len / ATH11K_SPECTRAL_BIN_SIZE;
+	bin_sz = ab->hw_params.spectral.fft_sz + ab->hw_params.spectral.fft_pad_sz;
+	num_bins = bin_len / bin_sz;
 	/* Only In-band bins are useful to user for visualize */
 	num_bins >>= 1;
 
@@ -654,7 +653,7 @@ int ath11k_spectral_process_fft(struct ath11k *ar,
 	fft_sample->freq2 = __cpu_to_be16(freq);
 
 	ath11k_spectral_parse_fft(fft_sample->data, fft_report->bins, num_bins,
-				  ab->hw_params.spectral_fft_sz);
+				  ab->hw_params.spectral.fft_sz);
 
 	fft_sample->max_exp = ath11k_spectral_get_max_exp(fft_sample->max_index,
 							  search.peak_mag,
@@ -962,7 +961,7 @@ int ath11k_spectral_init(struct ath11k_base *ab)
 		      ab->wmi_ab.svc_map))
 		return 0;
 
-	if (!ab->hw_params.spectral_fft_sz)
+	if (!ab->hw_params.spectral.fft_sz)
 		return 0;
 
 	for (i = 0; i < ab->num_radios; i++) {