linux-kernel - [PATCH] mmc: cqhci: data size depending on queue depth

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Message-Id: <20190115191356.32714-1-alamy.liu@gmail.com>
Date:   Tue, 15 Jan 2019 11:13:50 -0800
From:   Alamy Liu <alamy.liu@...il.com>
To:     Venkat Gopalakrishnan <venkatg@...eaurora.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: cqhci: data size depending on queue depth

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@...il.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