[RFC] mmc: tmio: use SDIO master interrupt bit only when allowed

[Wolfram Sang]

The master bit to enable SDIO interrupts can only be accessed if
SCLKDIVEN bit allows that. However, the core uses the SDIO enable
callback at times when SCLKDIVEN forbids the change. This leads to
"timeout waiting for SD bus idle" messages.

We now activate the master bit in probe once if SDIO is supported. IRQ
en-/disabling will be done now by the individual IRQ enablement bits
only.

Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
---

Compile tested only, due to no testcase.

 drivers/mmc/host/tmio_mmc_pio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 700567603107a0..476c4e1094a014 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -140,12 +140,10 @@ static void tmio_mmc_enable_sdio_irq(struct mmc_host 
*mmc, int enable)
 
                host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
                                        ~TMIO_SDIO_STAT_IOIRQ;
-               sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
                sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
        } else if (!enable && host->sdio_irq_enabled) {
                host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
                sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
-               sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
 
                host->sdio_irq_enabled = false;
                pm_runtime_mark_last_busy(mmc_dev(mmc));
@@ -1137,7 +1135,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
        if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
                _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
                sd_ctrl_write16(_host, CTL_SDIO_IRQ_MASK, _host->sdio_irq_mask);
-               sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0000);
+               sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0001);
        }
 
        spin_lock_init(&_host->lock);
@@ -1185,6 +1183,9 @@ void tmio_mmc_host_remove(struct tmio_mmc_host *host)
        struct platform_device *pdev = host->pdev;
        struct mmc_host *mmc = host->mmc;
 
+       if (host->pdata->flags & TMIO_MMC_SDIO_IRQ)
+               sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
+
        if (!host->native_hotplug)
                pm_runtime_get_sync(&pdev->dev);
 
-- 
2.10.2