[PATCH] ath10k: Fix spectral scan for QCA99X0 family of chipsets
Mohammed Shafi Shajakhan (Mohammed Shafi)
mohammed at qti.qualcomm.com
Mon Apr 10 08:40:05 PDT 2017
Hello Adrian,
For reference, would you mind pulling out what hte format of the edge
detection dword is?
[shafi] Sorry I did not dig into the DWORD carrying some radar related info,
as this gets discarded anyway for spectral processing. If you think the discarded
data is going to be useful in some way ??, let me get the dump for you. But feel
free to experiment with this patch !
This is anyway needed for fixing spectral scan ...
If you look into this patch more closely it just extends what Raja had fixed
long time back for QCA99X0 alone
https://patchwork.kernel.org/patch/7040681/
regards,
shafi
On 10 April 2017 at 07:26, Mohammed Shafi Shajakhan
<mohammed at qti.qualcomm.com> wrote:
> From: Mohammed Shafi Shajakhan <mohammed at qti.qualcomm.com>
>
> spectral_bin length (number of bins per fft sample) is usually
> a value where (2^n = value), n is an integer. All of the QCA99X0
> family of chipsets seems to report a spectral_bin length of
> 2^n + 'm' bytes, where m = 4, 12 based on the chipset. This 'm'
> bytes seems to carry some radar related info which is currenly
> discarded only for 'bin_len = 68' bytes. Extend this discarding of
> irrelevant 'bin_len' for QCA9984, QCA9888, IPQ4019 as well by
> introducing a hardware parameter 'spectral_bin_discard'. Also
> for QCA988X based family of chipsets which doesn't seem to have this
> issue and also for some of the hardware which I have not tested
> like QCA6174/QCA9377 the existing behaviour is retained as it is.
>
> Signed-off-by: Mohammed Shafi Shajakhan <mohammed at qti.qualcomm.com>
> ---
>
> drivers/net/wireless/ath/ath10k/core.c | 12 ++++++++++++
> drivers/net/wireless/ath/ath10k/hw.h | 3 +++
> drivers/net/wireless/ath/ath10k/spectral.c | 25 +++++++++++++++++--------
> 3 files changed, 32 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
> index 5736f79..b543c84 100644
> --- a/drivers/net/wireless/ath/ath10k/core.c
> +++ b/drivers/net/wireless/ath/ath10k/core.c
> @@ -71,6 +71,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA9887_HW_1_0_VERSION,
> @@ -91,6 +92,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA6174_HW_2_1_VERSION,
> @@ -110,6 +112,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA6174_HW_2_1_VERSION,
> @@ -129,6 +132,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA6174_HW_3_0_VERSION,
> @@ -148,6 +152,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA6174_HW_3_2_VERSION,
> @@ -168,6 +173,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA99X0_HW_2_0_DEV_VERSION,
> @@ -193,6 +199,7 @@
> .sw_decrypt_mcast_mgmt = true,
> .hw_ops = &qca99x0_ops,
> .decap_align_bytes = 1,
> + .spectral_bin_discard = 4,
> },
> {
> .id = QCA9984_HW_1_0_DEV_VERSION,
> @@ -219,6 +226,7 @@
> .sw_decrypt_mcast_mgmt = true,
> .hw_ops = &qca99x0_ops,
> .decap_align_bytes = 1,
> + .spectral_bin_discard = 12,
> },
> {
> .id = QCA9888_HW_2_0_DEV_VERSION,
> @@ -244,6 +252,7 @@
> .sw_decrypt_mcast_mgmt = true,
> .hw_ops = &qca99x0_ops,
> .decap_align_bytes = 1,
> + .spectral_bin_discard = 12,
> },
> {
> .id = QCA9377_HW_1_0_DEV_VERSION,
> @@ -263,6 +272,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA9377_HW_1_1_DEV_VERSION,
> @@ -282,6 +292,7 @@
> },
> .hw_ops = &qca988x_ops,
> .decap_align_bytes = 4,
> + .spectral_bin_discard = 0,
> },
> {
> .id = QCA4019_HW_1_0_DEV_VERSION,
> @@ -308,6 +319,7 @@
> .sw_decrypt_mcast_mgmt = true,
> .hw_ops = &qca99x0_ops,
> .decap_align_bytes = 1,
> + .spectral_bin_discard = 4,
> },
> };
>
> diff --git a/drivers/net/wireless/ath/ath10k/hw.h b/drivers/net/wireless/ath/ath10k/hw.h
> index f0fda0f..8a0f9db 100644
> --- a/drivers/net/wireless/ath/ath10k/hw.h
> +++ b/drivers/net/wireless/ath/ath10k/hw.h
> @@ -416,6 +416,9 @@ struct ath10k_hw_params {
>
> /* Number of bytes used for alignment in rx_hdr_status of rx desc. */
> int decap_align_bytes;
> +
> + /* Number of bytes to be discarded for each FFT sample */
> + int spectral_bin_discard;
> };
>
> struct htt_rx_desc;
> diff --git a/drivers/net/wireless/ath/ath10k/spectral.c b/drivers/net/wireless/ath/ath10k/spectral.c
> index c061d69..3fd5d7d 100644
> --- a/drivers/net/wireless/ath/ath10k/spectral.c
> +++ b/drivers/net/wireless/ath/ath10k/spectral.c
> @@ -56,6 +56,21 @@ static uint8_t get_max_exp(s8 max_index, u16 max_magnitude, size_t bin_len,
> return max_exp;
> }
>
> +static inline size_t ath10k_spectral_fix_bin_size(struct ath10k *ar,
> + size_t bin_len)
> +{
> + /* some chipsets reports bin size as 2^n bytes + 'm' bytes in
> + * report mode 2. First 2^n bytes carries inband tones and last
> + * 'm' bytes carries band edge detection data mainly used in
> + * radar detection purpose. Strip last 'm' bytes to make bin size
> + * as a valid one. 'm' can take possible values of 4, 12.
> + */
> + if (!is_power_of_2(bin_len))
> + bin_len -= ar->hw_params.spectral_bin_discard;
> +
> + return bin_len;
> +}
> +
> int ath10k_spectral_process_fft(struct ath10k *ar,
> struct wmi_phyerr_ev_arg *phyerr,
> const struct phyerr_fft_report *fftr,
> @@ -70,17 +85,11 @@ int ath10k_spectral_process_fft(struct ath10k *ar,
>
> fft_sample = (struct fft_sample_ath10k *)&buf;
>
> + bin_len = ath10k_spectral_fix_bin_size(ar, bin_len);
> +
> if (bin_len < 64 || bin_len > SPECTRAL_ATH10K_MAX_NUM_BINS)
> return -EINVAL;
>
> - /* qca99x0 reports bin size as 68 bytes (64 bytes + 4 bytes) in
> - * report mode 2. First 64 bytes carries inband tones (-32 to +31)
> - * and last 4 byte carries band edge detection data (+32) mainly
> - * used in radar detection purpose. Strip last 4 byte to make bin
> - * size is valid one.
> - */
> - if (bin_len == 68)
> - bin_len -= 4;
>
> reg0 = __le32_to_cpu(fftr->reg0);
> reg1 = __le32_to_cpu(fftr->reg1);
> --
> 1.9.1
>
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