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mmc: dw_mmc: Add fifo watermark alignment property

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Data done irq is expected if data length is less than
watermark in PIO mode. But fifo watermark is requested
to be aligned with data length in some SoC so that TX/RX
irq can be generated with data done irq. Add the
watermark alignment to mark this requirement and force
fifo watermark setting accordingly.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jun Nie
2017-01-11 15:37:26 +09:00
committed by Ulf Hansson
parent a0361c1a4d
commit d6fced8337
2 changed files with 12 additions and 2 deletions
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11
drivers/mmc/host/dw_mmc.c
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@@ -1112,11 +1112,15 @@ static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
mci_writel(host, CTRL, temp);
/*
* Use the initial fifoth_val for PIO mode.
* Use the initial fifoth_val for PIO mode. If wm_algined
* is set, we set watermark same as data size.
* If next issued data may be transfered by DMA mode,
* prev_blksz should be invalidated.
*/
mci_writel(host, FIFOTH, host->fifoth_val);
if (host->wm_aligned)
dw_mci_adjust_fifoth(host, data);
else
mci_writel(host, FIFOTH, host->fifoth_val);
host->prev_blksz = 0;
} else {
/*
@@ -2978,6 +2982,9 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
of_property_read_u32(np, "data-addr", &host->data_addr_override);
if (of_get_property(np, "fifo-watermark-aligned", NULL))
host->wm_aligned = true;
if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
pdata->bus_hz = clock_frequency;