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mmc: sdhi: use maximum width for the sdbuf register 

Make use of the 64 bit sdbuf width on Renesas R-Car Gen3. If the
registers are 8 byte apart, the width is also 64 bit. For all others,
the width is 32 bit, even if the registers are only 16 bit apart.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2017-08-09 20:29:26 +02:00 committed by Ulf Hansson
parent c7825151c7
commit 41279f0197
1 changed files with 4 additions and 3 deletions
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7
drivers/mmc/host/renesas_sdhi_core.c
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@ -460,10 +460,11 @@ static int renesas_sdhi_multi_io_quirk(struct mmc_card *card,
static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
{
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
/* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */
int width = (host->bus_shift == 2) ? 64 : 32;
/* enable 32bit access if DMA mode if possibile */
renesas_sdhi_sdbuf_width(host, enable ? 32 : 16);
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
renesas_sdhi_sdbuf_width(host, enable ? width : 16);
}
int renesas_sdhi_probe(struct platform_device *pdev,