diff options
| author | Alex Elder <elder@linaro.org> | 2021-03-20 18:57:04 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-21 04:56:18 +0300 |
| commit | b9aa0805ed31ed95c720f1a0bb606de2988b3ef5 (patch) | |
| tree | be2f15a0d6aa689f310fa23a7626f970b9a7f4a9 /drivers/net/ipa | |
| parent | 8a81efac9417b7e4b2d3e19442f22dcf727944d5 (diff) | |
| download | linux-b9aa0805ed31ed95c720f1a0bb606de2988b3ef5.tar.xz | |
net: ipa: implement MAX_READS_BEATS QSB data
Starting with IPA v4.0, a limit is placed on the number of bytes
outstanding in a transaction, to reduce latency. The limit is
imposed only if this value is non-zero.
We don't use a non-zero value for SC7180, but newer versions of IPA
do. Prepare for that by allowing a programmed value to be specified
in the platform configuration data.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ipa')
| -rw-r--r-- | drivers/net/ipa/ipa_data-sc7180.c | 1 | ||||
| -rw-r--r-- | drivers/net/ipa/ipa_data.h | 2 | ||||
| -rw-r--r-- | drivers/net/ipa/ipa_main.c | 10 |
3 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-sc7180.c index 216f790b22b6..8fa10d0d9a4e 100644 --- a/drivers/net/ipa/ipa_data-sc7180.c +++ b/drivers/net/ipa/ipa_data-sc7180.c @@ -14,6 +14,7 @@ static const struct ipa_qsb_data ipa_qsb_data[] = { [IPA_QSB_MASTER_DDR] = { .max_writes = 8, .max_reads = 12, + /* no outstanding read byte (beat) limit */ }, }; diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h index d50cd5ae7714..4162c4722c00 100644 --- a/drivers/net/ipa/ipa_data.h +++ b/drivers/net/ipa/ipa_data.h @@ -59,10 +59,12 @@ enum ipa_qsb_master_id { * struct ipa_qsb_data - Qualcomm System Bus configuration data * @max_writes: Maximum outstanding write requests for this master * @max_reads: Maximum outstanding read requests for this master + * @max_reads_beats: Max outstanding read bytes in 8-byte "beats" (if non-zero) */ struct ipa_qsb_data { u8 max_writes; u8 max_reads; + u8 max_reads_beats; /* Not present for IPA v3.5.1 */ }; /** diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 1ce593b46b04..64b92dfdd3f5 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -274,10 +274,16 @@ ipa_hardware_config_qsb(struct ipa *ipa, const struct ipa_data *data) /* Max outstanding read accesses for QSB masters */ val = u32_encode_bits(data0->max_reads, GEN_QMB_0_MAX_READS_FMASK); - /* GEN_QMB_0_MAX_READS_BEATS is 0 (IPA v4.0 and above) */ - if (data->qsb_count > 1) + if (ipa->version >= IPA_VERSION_4_0) + val |= u32_encode_bits(data0->max_reads_beats, + GEN_QMB_0_MAX_READS_BEATS_FMASK); + if (data->qsb_count > 1) { val |= u32_encode_bits(data1->max_reads, GEN_QMB_1_MAX_READS_FMASK); + if (ipa->version >= IPA_VERSION_4_0) + val |= u32_encode_bits(data1->max_reads_beats, + GEN_QMB_1_MAX_READS_BEATS_FMASK); + } iowrite32(val, ipa->reg_virt + IPA_REG_QSB_MAX_READS_OFFSET); } |