56 lines
2.0 KiB
Diff
56 lines
2.0 KiB
Diff
From patchwork Fri Jul 8 10:40:14 2016
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [U-Boot,
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RESEND] sunxi: mmc: increase status register polling rate for data
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transfers
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From: Tobias Doerffel <tobias.doerffel@ed-chemnitz.de>
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X-Patchwork-Id: 646568
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X-Patchwork-Delegate: hdegoede@redhat.com
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Message-Id: <1467974414-18845-1-git-send-email-tobias.doerffel@ed-chemnitz.de>
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To: u-boot@lists.denx.de
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Cc: Tobias Doerffel <tobias.doerffel@ed-chemnitz.de>, ijc@hellion.org.uk
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Date: Fri, 8 Jul 2016 12:40:14 +0200
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With a recent bunch of SD3.0 cards in our A20-based board we
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experienced data transfer rates of about 250 KiB/s instead of 10 MiB/s
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with previous cards from the same vendor (both 4 GB/class 10). By
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increasing status register polling rate from 1 kHz to 1 MHz we were
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able to reach the original transfer rates again. With the old cards
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we now even reach about 16 MiB/s.
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Signed-off-by: Tobias Doerffel <tobias.doerffel@ed-chemnitz.de>
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---
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drivers/mmc/sunxi_mmc.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
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index ce2dc4a..36da3b3 100644
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--- a/drivers/mmc/sunxi_mmc.c
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+++ b/drivers/mmc/sunxi_mmc.c
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@@ -269,18 +269,18 @@ static int mmc_trans_data_by_cpu(struct mmc *mmc, struct mmc_data *data)
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unsigned i;
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unsigned *buff = (unsigned int *)(reading ? data->dest : data->src);
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unsigned byte_cnt = data->blocksize * data->blocks;
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- unsigned timeout_msecs = byte_cnt >> 8;
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- if (timeout_msecs < 2000)
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- timeout_msecs = 2000;
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+ unsigned timeout_usecs = (byte_cnt >> 8) * 1000;
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+ if (timeout_usecs < 2000000)
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+ timeout_usecs = 2000000;
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/* Always read / write data through the CPU */
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setbits_le32(&mmchost->reg->gctrl, SUNXI_MMC_GCTRL_ACCESS_BY_AHB);
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for (i = 0; i < (byte_cnt >> 2); i++) {
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while (readl(&mmchost->reg->status) & status_bit) {
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- if (!timeout_msecs--)
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+ if (!timeout_usecs--)
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return -1;
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- udelay(1000);
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+ udelay(1);
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}
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if (reading)
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