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HSI: omap_ssi_port: avoid pm_runtime_get_sync in ssi_start_dma and ssi_start_pio 

These functions may be called from atomic context,
so avoid synchronous runtime pm calls.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Pavel Machek <pavel@ucw.cz>
hifive-unleashed-5.1
Sebastian Reichel 2016-06-17 21:59:06 +02:00
parent c4a6257315
commit 62aa292b3e
1 changed files with 24 additions and 6 deletions
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30
drivers/hsi/controllers/omap_ssi_port.c
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@ -225,11 +225,21 @@ static int ssi_start_dma(struct hsi_msg *msg, int lch)
u32 d_addr;
u32 tmp;
/* Hold clocks during the transfer */
pm_runtime_get(omap_port->pdev);
if (!pm_runtime_active(omap_port->pdev)) {
dev_warn(&port->device, "ssi_start_dma called without runtime PM!\n");
pm_runtime_put(omap_port->pdev);
return -EREMOTEIO;
}
if (msg->ttype == HSI_MSG_READ) {
err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
DMA_FROM_DEVICE);
if (err < 0) {
dev_dbg(&ssi->device, "DMA map SG failed !\n");
pm_runtime_put(omap_port->pdev);
return err;
}
csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
@ -246,6 +256,7 @@ static int ssi_start_dma(struct hsi_msg *msg, int lch)
DMA_TO_DEVICE);
if (err < 0) {
dev_dbg(&ssi->device, "DMA map SG failed !\n");
pm_runtime_put(omap_port->pdev);
return err;
}
csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
@ -261,9 +272,6 @@ static int ssi_start_dma(struct hsi_msg *msg, int lch)
dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x d_addr %08x\n",
lch, csdp, ccr, s_addr, d_addr);
/* Hold clocks during the transfer */
pm_runtime_get_sync(omap_port->pdev);
writew_relaxed(csdp, gdd + SSI_GDD_CSDP_REG(lch));
writew_relaxed(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch));
writel_relaxed(d_addr, gdd + SSI_GDD_CDSA_REG(lch));
@ -290,11 +298,18 @@ static int ssi_start_pio(struct hsi_msg *msg)
struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
u32 val;
pm_runtime_get_sync(omap_port->pdev);
pm_runtime_get(omap_port->pdev);
if (!pm_runtime_active(omap_port->pdev)) {
dev_warn(&port->device, "ssi_start_pio called without runtime PM!\n");
pm_runtime_put(omap_port->pdev);
return -EREMOTEIO;
}
if (msg->ttype == HSI_MSG_WRITE) {
val = SSI_DATAACCEPT(msg->channel);
/* Hold clocks for pio writes */
pm_runtime_get_sync(omap_port->pdev);
pm_runtime_get(omap_port->pdev);
} else {
val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
}
@ -302,7 +317,7 @@ static int ssi_start_pio(struct hsi_msg *msg)
msg->ttype ? "write" : "read");
val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
pm_runtime_put_sync(omap_port->pdev);
pm_runtime_put(omap_port->pdev);
msg->actual_len = 0;
msg->status = HSI_STATUS_PROCEEDING;
@ -388,6 +403,8 @@ static int ssi_async(struct hsi_msg *msg)
queue = &omap_port->rxqueue[msg->channel];
}
msg->status = HSI_STATUS_QUEUED;
pm_runtime_get_sync(omap_port->pdev);
spin_lock_bh(&omap_port->lock);
list_add_tail(&msg->link, queue);
err = ssi_start_transfer(queue);
@ -396,6 +413,7 @@ static int ssi_async(struct hsi_msg *msg)
msg->status = HSI_STATUS_ERROR;
}
spin_unlock_bh(&omap_port->lock);
pm_runtime_put(omap_port->pdev);
dev_dbg(&port->device, "msg status %d ttype %d ch %d\n",
msg->status, msg->ttype, msg->channel);