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mmc: tmio: move TMIO_MASK_{READOP, WRITEOP} handling to correct place 

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>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Masahiro Yamada 2018-01-18 01:28:14 +09:00 committed by Ulf Hansson
parent c7cd630a97
commit b12a7a28f8
3 changed files with 10 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/mmc/host/renesas_sdhi_internal_dmac.c
View File

@ -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);

4
drivers/mmc/host/renesas_sdhi_sys_dmac.c
View File

@ -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;

20
drivers/mmc/host/tmio_mmc_core.c
View File

@ -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);
@ -1273,12 +1279,6 @@ 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)