net: ipa: kill FILT_ROUT_CACHE_CFG IPA register

A recent commit defined a few IPA registers used for IPA v5.0+.
One of those was a mistake.  Although the filter and router caches
get *flushed* using a single register, they use distinct registers
(ENDP_FILTER_CACHE_CFG and ENDP_ROUTER_CACHE_CFG) for configuration.

And although there *exists* a FILT_ROUT_CACHE_CFG register, it is
not needed in upstream code.  So get rid of definitions related to
FILT_ROUT_CACHE_CFG, because they are not needed.

Fixes: 8ba59716 ("net: ipa: define IPA v5.0+ registers")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/ipa_reg.c

@@ -39,7 +39,8 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 		return version <= IPA_VERSION_3_1;
 
 	case ENDP_FILTER_ROUTER_HSH_CFG:
-		return version != IPA_VERSION_4_2;
+		return version < IPA_VERSION_5_0 &&
+			version != IPA_VERSION_4_2;
 
 	case IRQ_SUSPEND_EN:
 	case IRQ_SUSPEND_CLR:
@@ -52,7 +53,6 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 	case QSB_MAX_WRITES:
 	case QSB_MAX_READS:
 	case FILT_ROUT_HASH_EN:
-	case FILT_ROUT_CACHE_CFG:
 	case FILT_ROUT_HASH_FLUSH:
 	case FILT_ROUT_CACHE_FLUSH:
 	case STATE_AGGR_ACTIVE:

drivers/net/ipa/ipa_reg.h

@@ -61,7 +61,6 @@ enum ipa_reg_id {
 	QSB_MAX_WRITES,
 	QSB_MAX_READS,
 	FILT_ROUT_HASH_EN,				/* Not IPA v5.0+ */
-	FILT_ROUT_CACHE_CFG,				/* IPA v5.0+ */
 	FILT_ROUT_HASH_FLUSH,				/* Not IPA v5.0+ */
 	FILT_ROUT_CACHE_FLUSH,				/* IPA v5.0+ */
 	STATE_AGGR_ACTIVE,
@@ -206,14 +205,6 @@ enum ipa_reg_qsb_max_reads_field_id {
 	GEN_QMB_1_MAX_READS_BEATS,			/* IPA v4.0+ */
 };
 
-/* FILT_ROUT_CACHE_CFG register */
-enum ipa_reg_filt_rout_cache_cfg_field_id {
-	ROUTER_CACHE_EN,
-	FILTER_CACHE_EN,
-	LOW_PRI_HASH_HIT_DISABLE,
-	LRU_EVICTION_THRESHOLD,
-};
-
 /* FILT_ROUT_HASH_EN and FILT_ROUT_HASH_FLUSH registers */
 enum ipa_reg_filt_rout_hash_field_id {
 	IPV6_ROUTER_HASH,