diff options
| author | Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> | 2018-09-13 16:47:08 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-08 11:40:43 +0200 |
| commit | 54541815b43f4e49c82628bf28bbb31d86d2f58a (patch) | |
| tree | 65f2d7e02862ceacf51000998ad827ca9d378f4e /drivers/mmc/host/renesas_sdhi_internal_dmac.c | |
| parent | 07bafc1e3536a4e3c422dbd13341688b54f159bb (diff) | |
mmc: renesas_sdhi_internal_dmac: set scatter/gather max segment size
Fix warning when running with CONFIG_DMA_API_DEBUG_SG=y by allocating a
device_dma_parameters structure and filling in the max segment size. The
size used is the result of a discussion with Renesas hardware engineers
and unfortunately not found in the datasheet.
renesas_sdhi_internal_dmac ee140000.sd: DMA-API: mapping sg segment
longer than device claims to support [len=126976] [max=65536]
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
[wsa: simplified some logic after validating intended dma_parms life cycle
and added comment]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/renesas_sdhi_internal_dmac.c')
| -rw-r--r-- | drivers/mmc/host/renesas_sdhi_internal_dmac.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c index c9dab9ce1ed5..e5e5015ca680 100644 --- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c +++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c @@ -308,12 +308,20 @@ static const struct soc_device_attribute gen3_soc_whitelist[] = { static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev) { const struct soc_device_attribute *soc = soc_device_match(gen3_soc_whitelist); + struct device *dev = &pdev->dev; if (!soc) return -ENODEV; global_flags |= (unsigned long)soc->data; + dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL); + if (!dev->dma_parms) + return -ENOMEM; + + /* value is max of SD_SECCNT. Confirmed by HW engineers */ + dma_set_max_seg_size(dev, 0xffffffff); + return renesas_sdhi_probe(pdev, &renesas_sdhi_internal_dmac_dma_ops); } |