korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-28 14:44:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

MMC host:

Browse Source 
- meson-gx: Use memcpy_to/fromio for dram-access-quirk
 -----BEGIN PGP SIGNATURE-----
 
 iQJLBAABCgA1FiEEugLDXPmKSktSkQsV/iaEJXNYjCkFAmDUelMXHHVsZi5oYW5z
 c29uQGxpbmFyby5vcmcACgkQ/iaEJXNYjCnakRAAx0hqRx81DqMjQVDNX1BDLoxQ
 fQrgJkv5ZnybPgpUf6udbkr60+tL9SOocryIAHNE8UQjYuecbC/0Zdv/ToHrAiBt
 O2rZnmNwMOSlaW4yH4g85K+W2q2QCg3KEpo6gfQkbi6fEUJ7Sp+7K380rsMHaNee
 +AGWcbnchMttizCxOcaRP/JjqPLL2T6J/R/JXuZvZiYbFXw2bZzjKqzyfWhNKJCZ
 L6HjEiAg1MCXCGgwnGWnwWyrOWGCFIs/fY//mXA/WYeviHVBR7ZrQ0M/Z4T5+ji7
 P/lMI6zWbZtwsgtD+Rm9wWBOQc+/JZTUJxm1eftrBlDJ9lTrC8NQP1kQLS+IV46X
 Run1PfPj5DCyv7ak5wO0QkLYpzpLE6BUmbc0fOl27AVSqnWTlquFlqDIMjDYcx6d
 v+lZOpzT+plxym3vJqvxqHBcxzoyoplbqLqRb1ysUvuG3OTvDgusZmeScvR+nEvY
 MUr+pTzHFLnU8F+/h/tsnqPgqNnt6bxWtwT+MWkh7SkXEr4ReUVHHC/qtcRfNev9
 RsqtnTneS1QAF3Gj6Wqu8yIVXY4g9Mca+a34VpKUM3NU71K26I2sBftuPgLA9iV7
 P8KBRlM4invpS4CPiiBWtD0sgCY9kXlLrsAvF33IVP/fbpK6j+Ne9ac/3ehFZBoH
 OC7SkrD6fteMBDa1czc=
 =w5Qq
 -----END PGP SIGNATURE-----

Merge tag 'mmc-v5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC fix from Ulf Hansson:
 "Use memcpy_to/fromio for dram-access-quirk in the meson-gx host
  driver"

* tag 'mmc-v5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk
This commit is contained in:
Linus Torvalds 2021-06-24 10:53:05 -07:00
commit 4a09d388f2
1 changed files with 45 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/mmc/host/meson-gx-mmc.c
View File

@ -165,6 +165,7 @@ struct meson_host {
unsigned int bounce_buf_size;
void *bounce_buf;
void __iomem *bounce_iomem_buf;
dma_addr_t bounce_dma_addr;
struct sd_emmc_desc *descs;
dma_addr_t descs_dma_addr;
@ -745,6 +746,47 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg)
writel(start, host->regs + SD_EMMC_START);
}
/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */
static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data,
size_t buflen, bool to_buffer)
{
unsigned int sg_flags = SG_MITER_ATOMIC;
struct scatterlist *sgl = data->sg;
unsigned int nents = data->sg_len;
struct sg_mapping_iter miter;
unsigned int offset = 0;
if (to_buffer)
sg_flags |= SG_MITER_FROM_SG;
else
sg_flags |= SG_MITER_TO_SG;
sg_miter_start(&miter, sgl, nents, sg_flags);
while ((offset < buflen) && sg_miter_next(&miter)) {
unsigned int len;
len = min(miter.length, buflen - offset);
/* When dram_access_quirk, the bounce buffer is a iomem mapping */
if (host->dram_access_quirk) {
if (to_buffer)
memcpy_toio(host->bounce_iomem_buf + offset, miter.addr, len);
else
memcpy_fromio(miter.addr, host->bounce_iomem_buf + offset, len);
} else {
if (to_buffer)
memcpy(host->bounce_buf + offset, miter.addr, len);
else
memcpy(miter.addr, host->bounce_buf + offset, len);
}
offset += len;
}
sg_miter_stop(&miter);
}
static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
{
struct meson_host *host = mmc_priv(mmc);
@ -788,8 +830,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
if (data->flags & MMC_DATA_WRITE) {
cmd_cfg |= CMD_CFG_DATA_WR;
WARN_ON(xfer_bytes > host->bounce_buf_size);
sg_copy_to_buffer(data->sg, data->sg_len,
host->bounce_buf, xfer_bytes);
meson_mmc_copy_buffer(host, data, xfer_bytes, true);
dma_wmb();
}
@ -958,8 +999,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
if (meson_mmc_bounce_buf_read(data)) {
xfer_bytes = data->blksz * data->blocks;
WARN_ON(xfer_bytes > host->bounce_buf_size);
sg_copy_from_buffer(data->sg, data->sg_len,
host->bounce_buf, xfer_bytes);
meson_mmc_copy_buffer(host, data, xfer_bytes, false);
}
next_cmd = meson_mmc_get_next_command(cmd);
@ -1179,7 +1219,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
* instead of the DDR memory
*/
host->bounce_buf_size = SD_EMMC_SRAM_DATA_BUF_LEN;
host->bounce_buf = host->regs + SD_EMMC_SRAM_DATA_BUF_OFF;
host->bounce_iomem_buf = host->regs + SD_EMMC_SRAM_DATA_BUF_OFF;
host->bounce_dma_addr = res->start + SD_EMMC_SRAM_DATA_BUF_OFF;
} else {
/* data bounce buffer */