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Message-ID: <3f6c17a8-b901-c64f-2fbb-48faabccd255@ieee.org>
Date: Wed, 13 Oct 2021 17:30:20 -0500
From: Alex Elder <elder@...e.org>
To: Sireesh Kodali <sireeshkodali1@...il.com>,
phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, elder@...nel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC PATCH 11/17] net: ipa: Add support for IPA v2.x endpoints
On 9/19/21 10:08 PM, Sireesh Kodali wrote:
> IPA v2.x endpoints are the same as the endpoints on later versions. The
> only big change was the addition of the "skip_config" flag. The only
> other change is the backlog limit, which is a fixed number for IPA v2.6L
Not much to say here. Your patches are reasonably small, which
makes them easier to review (thank you).
-Alex
> Signed-off-by: Sireesh Kodali <sireeshkodali1@...il.com>
> ---
> drivers/net/ipa/ipa_endpoint.c | 65 ++++++++++++++++++++++------------
> 1 file changed, 43 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
> index 7d3ab61cd890..024cf3a0ded0 100644
> --- a/drivers/net/ipa/ipa_endpoint.c
> +++ b/drivers/net/ipa/ipa_endpoint.c
> @@ -360,8 +360,10 @@ void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
> {
> u32 endpoint_id;
>
> - /* DELAY mode doesn't work correctly on IPA v4.2 */
> - if (ipa->version == IPA_VERSION_4_2)
> + /* DELAY mode doesn't work correctly on IPA v4.2
> + * Pausing is not supported on IPA v2.6L
> + */
> + if (ipa->version == IPA_VERSION_4_2 || ipa->version <= IPA_VERSION_2_6L)
> return;
>
> for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
> @@ -383,6 +385,7 @@ int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
> {
> u32 initialized = ipa->initialized;
> struct ipa_trans *trans;
> + u32 value = 0, value_mask = ~0;
> u32 count;
>
> /* We need one command per modem TX endpoint. We can get an upper
> @@ -398,6 +401,11 @@ int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
> return -EBUSY;
> }
>
> + if (ipa->version <= IPA_VERSION_2_6L) {
> + value = aggr_force_close_fmask(true);
> + value_mask = aggr_force_close_fmask(true);
> + }
> +
> while (initialized) {
> u32 endpoint_id = __ffs(initialized);
> struct ipa_endpoint *endpoint;
> @@ -416,7 +424,7 @@ int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
> * means status is disabled on the endpoint, and as a
> * result all other fields in the register are ignored.
> */
> - ipa_cmd_register_write_add(trans, offset, 0, ~0, false);
> + ipa_cmd_register_write_add(trans, offset, value, value_mask, false);
> }
>
> ipa_cmd_pipeline_clear_add(trans);
> @@ -1531,8 +1539,10 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
> ipa_endpoint_init_mode(endpoint);
> ipa_endpoint_init_aggr(endpoint);
> ipa_endpoint_init_deaggr(endpoint);
> - ipa_endpoint_init_rsrc_grp(endpoint);
> - ipa_endpoint_init_seq(endpoint);
> + if (endpoint->ipa->version > IPA_VERSION_2_6L) {
> + ipa_endpoint_init_rsrc_grp(endpoint);
> + ipa_endpoint_init_seq(endpoint);
> + }
> ipa_endpoint_status(endpoint);
> }
>
> @@ -1592,7 +1602,6 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
> {
> struct device *dev = &endpoint->ipa->pdev->dev;
> struct ipa_dma *gsi = &endpoint->ipa->dma_subsys;
> - bool stop_channel;
> int ret;
>
> if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
> @@ -1613,7 +1622,6 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
> {
> struct device *dev = &endpoint->ipa->pdev->dev;
> struct ipa_dma *gsi = &endpoint->ipa->dma_subsys;
> - bool start_channel;
> int ret;
>
> if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
> @@ -1750,23 +1758,33 @@ int ipa_endpoint_config(struct ipa *ipa)
> /* Find out about the endpoints supplied by the hardware, and ensure
> * the highest one doesn't exceed the number we support.
> */
> - val = ioread32(ipa->reg_virt + IPA_REG_FLAVOR_0_OFFSET);
> -
> - /* Our RX is an IPA producer */
> - rx_base = u32_get_bits(val, IPA_PROD_LOWEST_FMASK);
> - max = rx_base + u32_get_bits(val, IPA_MAX_PROD_PIPES_FMASK);
> - if (max > IPA_ENDPOINT_MAX) {
> - dev_err(dev, "too many endpoints (%u > %u)\n",
> - max, IPA_ENDPOINT_MAX);
> - return -EINVAL;
> - }
> - rx_mask = GENMASK(max - 1, rx_base);
> + if (ipa->version <= IPA_VERSION_2_6L) {
> + // FIXME Not used anywhere?
> + if (ipa->version == IPA_VERSION_2_6L)
> + val = ioread32(ipa->reg_virt +
> + IPA_REG_V2_ENABLED_PIPES_OFFSET);
> + /* IPA v2.6L supports 20 pipes */
> + ipa->available = ipa->filter_map;
> + return 0;
> + } else {
> + val = ioread32(ipa->reg_virt + IPA_REG_FLAVOR_0_OFFSET);
> +
> + /* Our RX is an IPA producer */
> + rx_base = u32_get_bits(val, IPA_PROD_LOWEST_FMASK);
> + max = rx_base + u32_get_bits(val, IPA_MAX_PROD_PIPES_FMASK);
> + if (max > IPA_ENDPOINT_MAX) {
> + dev_err(dev, "too many endpoints (%u > %u)\n",
> + max, IPA_ENDPOINT_MAX);
> + return -EINVAL;
> + }
> + rx_mask = GENMASK(max - 1, rx_base);
>
> - /* Our TX is an IPA consumer */
> - max = u32_get_bits(val, IPA_MAX_CONS_PIPES_FMASK);
> - tx_mask = GENMASK(max - 1, 0);
> + /* Our TX is an IPA consumer */
> + max = u32_get_bits(val, IPA_MAX_CONS_PIPES_FMASK);
> + tx_mask = GENMASK(max - 1, 0);
>
> - ipa->available = rx_mask | tx_mask;
> + ipa->available = rx_mask | tx_mask;
> + }
>
> /* Check for initialized endpoints not supported by the hardware */
> if (ipa->initialized & ~ipa->available) {
> @@ -1865,6 +1883,9 @@ u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
> filter_map |= BIT(data->endpoint_id);
> }
>
> + if (ipa->version <= IPA_VERSION_2_6L)
> + filter_map = 0x1fffff;
> +
> if (!ipa_filter_map_valid(ipa, filter_map))
> goto err_endpoint_exit;
>
>
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