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net: ipa: FLAVOR_0 register doesn't exist until IPA v3.5
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>
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@ -1731,6 +1731,21 @@ int ipa_endpoint_config(struct ipa *ipa)
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u32 max;
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u32 val;
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/* Prior to IPAv3.5, the FLAVOR_0 register was not supported.
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* Furthermore, the endpoints were not grouped such that TX
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* endpoint numbers started with 0 and RX endpoints had numbers
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* higher than all TX endpoints, so we can't do the simple
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* direction check used for newer hardware below.
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*
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* For hardware that doesn't support the FLAVOR_0 register,
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* just set the available mask to support any endpoint, and
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* assume the configuration is valid.
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*/
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if (ipa->version < IPA_VERSION_3_5) {
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ipa->available = ~0;
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return 0;
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}
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/* Find out about the endpoints supplied by the hardware, and ensure
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* the highest one doesn't exceed the number we support.
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*/
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