From: Alamy Liu <alamy.liu@gmail.com>
To: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] mmc: cqhci: data size depending on queue depth
Date: Tue, 15 Jan 2019 11:13:50 -0800 [thread overview]
Message-ID: <20190115191356.32714-1-alamy.liu@gmail.com> (raw)
CQE_DCMD is not necessary to be enabled when CQE is enabled.
(Software could halt CQE to send command, or via DCMD)
In the case that CQE_DCMD is not enabled, it still needs to allocate
space for data transfer. For instance:
CQE_DCMD is enabled: 32 slots space
CQE_DCMD is disabled: 31 slots space (is good enough)
Signed-off-by: Alamy Liu <alamy.liu@gmail.com>
---
drivers/mmc/host/cqhci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
index 4cc7863c13..974997b6cb 100644
--- a/drivers/mmc/host/cqhci.c
+++ b/drivers/mmc/host/cqhci.c
@@ -202,7 +202,7 @@ static int cqhci_host_alloc_tdl(struct cqhci_host *cq_host)
cq_host->desc_size = cq_host->slot_sz * cq_host->num_slots;
cq_host->data_size = cq_host->trans_desc_len * cq_host->mmc->max_segs *
- (cq_host->num_slots - 1);
+ cq_host->mmc->cqe_qdepth;
pr_debug("%s: cqhci: desc_size: %zu data_sz: %zu slot-sz: %d\n",
mmc_hostname(cq_host->mmc), cq_host->desc_size, cq_host->data_size,
--
2.17.1
next reply other threads:[~2019-01-15 19:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 19:13 Alamy Liu [this message]
2019-01-31 9:53 ` [PATCH] mmc: cqhci: data size depending on queue depth Adrian Hunter
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