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Date: Fri, 27 Jul 2018 10:14:06 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH] mmc: tmio: allow DMA request hook to return error status
dma_request_chan() may return ERR_PTR(-EPROBE_DEFER), but
tmio_mmc_request_dma() cannot propagate it since it is a
void function.
Change the return type to int so that the driver can retry
probing later in case the DMA-engine driver is probed after
the TMIO MMC driver.
I moved the call for tmio_mmc_request_dma() up because it may
fail now. I also removed unneeded clearing of host->chan_{tx,rx}
because (struct tmio_mmc_host) is allocated by kzalloc().
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---
drivers/mmc/host/renesas_sdhi_internal_dmac.c | 4 +++-
drivers/mmc/host/renesas_sdhi_sys_dmac.c | 14 ++++++++------
drivers/mmc/host/tmio_mmc.h | 3 +--
drivers/mmc/host/tmio_mmc_core.c | 21 ++++++++++-----------
4 files changed, 22 insertions(+), 20 deletions(-)
diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
index d032bd6..f3475a5 100644
--- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
@@ -230,7 +230,7 @@ static void renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg)
spin_unlock_irq(&host->lock);
}
-static void
+static int
renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host,
struct tmio_mmc_data *pdata)
{
@@ -245,6 +245,8 @@ renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host,
tasklet_init(&host->dma_issue,
renesas_sdhi_internal_dmac_issue_tasklet_fn,
(unsigned long)host);
+
+ return 0;
}
static void
diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
index 4bb46c4..3f806f5 100644
--- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
@@ -359,15 +359,15 @@ static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
dma_async_issue_pending(chan);
}
-static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata)
+static int renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
{
struct renesas_sdhi *priv = host_to_priv(host);
/* We can only either use DMA for both Tx and Rx or not use it at all */
if (!host->pdev->dev.of_node &&
(!pdata->chan_priv_tx || !pdata->chan_priv_rx))
- return;
+ return 0;
if (!host->chan_tx && !host->chan_rx) {
struct resource *res = platform_get_resource(host->pdev,
@@ -377,7 +377,7 @@ static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
int ret;
if (!res)
- return;
+ return 0;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
@@ -389,7 +389,7 @@ static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
host->chan_tx);
if (!host->chan_tx)
- return;
+ return 0;
cfg.direction = DMA_MEM_TO_DEV;
cfg.dst_addr = res->start +
@@ -433,7 +433,7 @@ static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
renesas_sdhi_sys_dmac_enable_dma(host, true);
- return;
+ return 0;
ebouncebuf:
ecfgrx:
@@ -443,6 +443,8 @@ static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
ecfgtx:
dma_release_channel(host->chan_tx);
host->chan_tx = NULL;
+
+ return 0;
}
static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index e7d6513..d8383d4 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -115,8 +115,7 @@ struct tmio_mmc_host;
struct tmio_mmc_dma_ops {
void (*start)(struct tmio_mmc_host *host, struct mmc_data *data);
void (*enable)(struct tmio_mmc_host *host, bool enable);
- void (*request)(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata);
+ int (*request)(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
void (*release)(struct tmio_mmc_host *host);
void (*abort)(struct tmio_mmc_host *host);
void (*dataend)(struct tmio_mmc_host *host);
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 3cb554c..09c2d0c 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -65,15 +65,13 @@ static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
host->dma_ops->enable(host, enable);
}
-static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata)
+static inline int tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
{
- if (host->dma_ops) {
- host->dma_ops->request(host, pdata);
- } else {
- host->chan_tx = NULL;
- host->chan_rx = NULL;
- }
+ if (host->dma_ops)
+ return host->dma_ops->request(host, pdata);
+
+ return 0;
}
static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
@@ -1218,6 +1216,10 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
return ret;
}
+ ret = tmio_mmc_request_dma(_host, pdata);
+ if (ret)
+ return ret;
+
mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
mmc->caps2 |= pdata->capabilities2;
mmc->max_segs = pdata->max_segs ? : 32;
@@ -1286,9 +1288,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
INIT_WORK(&_host->done, tmio_mmc_done_work);
- /* See if we also get DMA */
- tmio_mmc_request_dma(_host, pdata);
-
pm_runtime_set_active(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
--
2.7.4
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