summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorSergei Antonov <saproj@gmail.com>2023-02-10 17:38:43 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2023-02-15 15:24:03 +0300
commit16b492ce0a55735ed6f4c19ee9fb767badb3f19a (patch)
tree01ab2290fb1843c642c3a0ae7bea9a60621bf57e /drivers/mmc
parent08623d741e94dc9ca033ecb8d04312960a105377 (diff)
downloadlinux-16b492ce0a55735ed6f4c19ee9fb767badb3f19a.tar.xz
mmc: moxart: set maximum request/block/segment sizes
Per datasheet: maximum block length is 2048 bytes, data length field is in bits 0-23 of the Data Length Register. Also for DMA mode we have to take into account rx/tx buffers' sizes. In my tests this change doubles SD card I/O performance on big files. Before the change Linux used default request size of 4 KB. Signed-off-by: Sergei Antonov <saproj@gmail.com> Link: https://lore.kernel.org/r/20230210143843.369943-1-saproj@gmail.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/moxart-mmc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c
index 52ed30f2d9f4..2d002c81dcf3 100644
--- a/drivers/mmc/host/moxart-mmc.c
+++ b/drivers/mmc/host/moxart-mmc.c
@@ -611,6 +611,9 @@ static int moxart_probe(struct platform_device *pdev)
mmc->f_max = DIV_ROUND_CLOSEST(host->sysclk, 2);
mmc->f_min = DIV_ROUND_CLOSEST(host->sysclk, CLK_DIV_MASK * 2);
mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */
+ mmc->max_blk_size = 2048; /* Max. block length in REG_DATA_CONTROL */
+ mmc->max_req_size = DATA_LEN_MASK; /* bits 0-23 in REG_DATA_LENGTH */
+ mmc->max_blk_count = mmc->max_req_size / 512;
if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) {
if (PTR_ERR(host->dma_chan_tx) == -EPROBE_DEFER ||
@@ -628,6 +631,8 @@ static int moxart_probe(struct platform_device *pdev)
}
dev_dbg(dev, "PIO mode transfer enabled\n");
host->have_dma = false;
+
+ mmc->max_seg_size = mmc->max_req_size;
} else {
dev_dbg(dev, "DMA channels found (%p,%p)\n",
host->dma_chan_tx, host->dma_chan_rx);
@@ -646,6 +651,10 @@ static int moxart_probe(struct platform_device *pdev)
cfg.src_addr = host->reg_phys + REG_DATA_WINDOW;
cfg.dst_addr = 0;
dmaengine_slave_config(host->dma_chan_rx, &cfg);
+
+ mmc->max_seg_size = min3(mmc->max_req_size,
+ dma_get_max_seg_size(host->dma_chan_rx->device->dev),
+ dma_get_max_seg_size(host->dma_chan_tx->device->dev));
}
if (readl(host->base + REG_BUS_WIDTH) & BUS_WIDTH_4_SUPPORT)