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Subject[PATCH v3 14/16] mmc: tmio: move TMIO_MASK_{READOP,WRITEOP} handling to correct place
Date
As far as I tested the IP on UniPhier SoCs, TMIO_STAT_{RXRDY,TXRQ}
are asserted for DMA mode as well as for PIO. I need to disable the
those IRQs in dma_ops->start hook, otherwise the DMA transfer fails
with the following error message:
PIO IRQ in DMA mode!

Renesas chips are the same cases since I see their dma_ops->start
hooks explicitly clear TMIO_STAT_{RXRDY,TXRQ} (with nice comment!).

If we do this sanity check in TMIO MMC core, RXRDY/TXRQ handling
should be entirely moved to the core. tmio_mmc_cmd_irq() will
be a suitable place to disable them.

The probe function sets TMIO_MASK_{READOP,WRITEOP} but this is odd.

/* Unmask the IRQs we want to know about */
if (!_host->chan_rx)
irq_mask |= TMIO_MASK_READOP;
if (!_host->chan_tx)
irq_mask |= TMIO_MASK_WRITEOP;

At this point, _host->{chan_rx,chan_tx} are _always_ NULL because
tmio_mmc_request_dma() is called after this code. Consequently,
TMIO_MASK_{READOP,WRITEOP} are set here whether DMA is used or not.
Remove this pointless code.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v3:
- Remove the first paragraph of git-log
- Clean up renesas drivers too

Changes in v2:
- Newly added

drivers/mmc/host/renesas_sdhi_internal_dmac.c | 6 ------
drivers/mmc/host/renesas_sdhi_sys_dmac.c | 4 ----
drivers/mmc/host/tmio_mmc_core.c | 20 ++++++++++----------
3 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
index 0d1f95e..693ad49 100644
--- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
@@ -145,7 +145,6 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
u32 dtran_mode = DTRAN_MODE_BUS_WID_TH | DTRAN_MODE_ADDR_MODE;
enum dma_data_direction dir;
int ret;
- u32 irq_mask;

/* This DMAC cannot handle if sg_len is not 1 */
WARN_ON(host->sg_len > 1);
@@ -157,11 +156,9 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
if (data->flags & MMC_DATA_READ) {
dtran_mode |= DTRAN_MODE_CH_NUM_CH1;
dir = DMA_FROM_DEVICE;
- irq_mask = TMIO_STAT_RXRDY;
} else {
dtran_mode |= DTRAN_MODE_CH_NUM_CH0;
dir = DMA_TO_DEVICE;
- irq_mask = TMIO_STAT_TXRQ;
}

ret = dma_map_sg(&host->pdev->dev, sg, host->sg_len, dir);
@@ -170,9 +167,6 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,

renesas_sdhi_internal_dmac_enable_dma(host, true);

- /* disable PIO irqs to avoid "PIO IRQ in DMA mode!" */
- tmio_mmc_disable_mmc_irqs(host, irq_mask);
-
/* set dma parameters */
renesas_sdhi_internal_dmac_dm_write(host, DM_CM_DTRAN_MODE,
dtran_mode);
diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
index afdb66b..393df17 100644
--- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
@@ -205,8 +205,6 @@ static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
return;
}

- tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY);
-
/* The only sg element can be unaligned, use our bounce buffer then */
if (!aligned) {
sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
@@ -280,8 +278,6 @@ static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
return;
}

- tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ);
-
/* The only sg element can be unaligned, use our bounce buffer then */
if (!aligned) {
unsigned long flags;
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 0e3dc8c..731552a 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -621,15 +621,21 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
*/
if (host->data && (!cmd->error || cmd->error == -EILSEQ)) {
if (host->data->flags & MMC_DATA_READ) {
- if (host->force_pio || !host->chan_rx)
+ if (host->force_pio || !host->chan_rx) {
tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
- else
+ } else {
+ tmio_mmc_disable_mmc_irqs(host,
+ TMIO_MASK_READOP);
tasklet_schedule(&host->dma_issue);
+ }
} else {
- if (host->force_pio || !host->chan_tx)
+ if (host->force_pio || !host->chan_tx) {
tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
- else
+ } else {
+ tmio_mmc_disable_mmc_irqs(host,
+ TMIO_MASK_WRITEOP);
tasklet_schedule(&host->dma_issue);
+ }
}
} else {
schedule_work(&host->done);
@@ -1287,12 +1293,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
_host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK);
tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);

- /* Unmask the IRQs we want to know about */
- if (!_host->chan_rx)
- irq_mask |= TMIO_MASK_READOP;
- if (!_host->chan_tx)
- irq_mask |= TMIO_MASK_WRITEOP;
-
_host->sdcard_irq_mask &= ~irq_mask;

if (_host->native_hotplug)
--
2.7.4
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