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net: ipa: FLAVOR_0 register doesn't exist until IPA v3.5

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The FLAVOR_0 version first appears in IPA v3.5, so avoid attempting
to read it for versions prior to that.

This register contains a concise definition of the number and
direction of endpoints supported by the hardware, and without it
we can't verify endpoint configuration in ipa_endpoint_config().
In this case, just indicate that any endpoint number is available
for use.

Originally proposed by AngeloGioacchino Del Regno.

Link: https://lore.kernel.org/netdev/20210211175015.200772-3-angelogioacchino.delregno@somainline.org
Signed-off-by: Alex Elder <elder@linaro.org>
Acked-by: AngeloGioacchino Del Regno
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2021-06-21 12:56:25 -05:00 committed by David S. Miller
parent 3833d0abd2
commit 110971d1ee
1 changed files with 15 additions and 0 deletions
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15
drivers/net/ipa/ipa_endpoint.c
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@ -1731,6 +1731,21 @@ int ipa_endpoint_config(struct ipa *ipa)
u32 max;
u32 val;
/* Prior to IPAv3.5, the FLAVOR_0 register was not supported.
* Furthermore, the endpoints were not grouped such that TX
* endpoint numbers started with 0 and RX endpoints had numbers
* higher than all TX endpoints, so we can't do the simple
* direction check used for newer hardware below.
*
* For hardware that doesn't support the FLAVOR_0 register,
* just set the available mask to support any endpoint, and
* assume the configuration is valid.
*/
if (ipa->version < IPA_VERSION_3_5) {
ipa->available = ~0;
return 0;
}
/* Find out about the endpoints supplied by the hardware, and ensure
* the highest one doesn't exceed the number we support.
*/