diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0039-staging-fsl_qbman-Calculate-valid-bit-from-MC-RR.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0039-staging-fsl_qbman-Calculate-valid-bit-from-MC-RR.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0039-staging-fsl_qbman-Calculate-valid-bit-from-MC-RR.patch b/target/linux/layerscape/patches-5.4/701-net-0039-staging-fsl_qbman-Calculate-valid-bit-from-MC-RR.patch new file mode 100644 index 0000000000..1e4cfe8069 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0039-staging-fsl_qbman-Calculate-valid-bit-from-MC-RR.patch @@ -0,0 +1,47 @@ +From 5ebee96094c5a97a89a986108242cca9d853ff55 Mon Sep 17 00:00:00 2001 +From: Roy Pledge <roy.pledge@nxp.com> +Date: Wed, 27 Sep 2017 14:50:08 -0400 +Subject: [PATCH] staging/fsl_qbman: Calculate valid bit from MC-RR + +Use the management commmand response registers to determine +the next expected valid bit when initializing a software +portal. This avoids using the wrong valid bit in cases +where a command was partially written but then not +completed. + +Signed-off-by: Roy Pledge <roy.pledge@nxp.com> +--- + drivers/staging/fsl_qbman/qman_low.h | 19 +++++++++++++++++-- + 1 file changed, 17 insertions(+), 2 deletions(-) + +--- a/drivers/staging/fsl_qbman/qman_low.h ++++ b/drivers/staging/fsl_qbman/qman_low.h +@@ -1095,11 +1095,26 @@ static inline void qm_mr_set_ithresh(str + + static inline int qm_mc_init(struct qm_portal *portal) + { ++ u8 rr0, rr1; + register struct qm_mc *mc = &portal->mc; ++ + mc->cr = portal->addr.addr_ce + QM_CL_CR; + mc->rr = portal->addr.addr_ce + QM_CL_RR0; +- mc->rridx = (__raw_readb(&mc->cr->__dont_write_directly__verb) & +- QM_MCC_VERB_VBIT) ? 0 : 1; ++ ++ /* ++ * The expected valid bit polarity for the next CR command is 0 ++ * if RR1 contains a valid response, and is 1 if RR0 contains a ++ * valid response. If both RR contain all 0, this indicates either ++ * that no command has been executed since reset (in which case the ++ * expected valid bit polarity is 1) ++ */ ++ rr0 = __raw_readb(&mc->rr->verb); ++ rr1 = __raw_readb(&(mc->rr+1)->verb); ++ if ((rr0 == 0 && rr1 == 0) || rr0 != 0) ++ mc->rridx = 1; ++ else ++ mc->rridx = 0; ++ + mc->vbit = mc->rridx ? QM_MCC_VERB_VBIT : 0; + #ifdef CONFIG_FSL_DPA_CHECKING + mc->state = qman_mc_idle; |