[PATCH 5.10.y-cip 11/39] mmc: tmio: add hook for custom busy_wait calculation


Lad Prabhakar
 

From: Wolfram Sang <wsa+renesas@...>

commit 58959f89dd3d8cc8bedcd2d665496603098b29a2 upstream.

Newer SDHI variants can 'wait while busy' longer than the generic TMIO.
Provide a hook to get the maximum cycle count to wait for. If the hook
is not populated, fall back to a generic version which works well with
all older TMIO/SDHI variants.

Signed-off-by: Wolfram Sang <wsa+renesas@...>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...>
Link: https://lore.kernel.org/r/20201125213001.15003-3-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@...>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...>
---
drivers/mmc/host/tmio_mmc.h | 1 +
drivers/mmc/host/tmio_mmc_core.c | 17 ++++++++++++-----
2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 819198af17f4..f60559bc413a 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -181,6 +181,7 @@ struct tmio_mmc_host {
void (*reset)(struct tmio_mmc_host *host);
bool (*check_retune)(struct tmio_mmc_host *host);
void (*fixup_request)(struct tmio_mmc_host *host, struct mmc_request *mrq);
+ unsigned int (*get_timeout_cycles)(struct tmio_mmc_host *host);

void (*prepare_hs400_tuning)(struct tmio_mmc_host *host);
void (*hs400_downgrade)(struct tmio_mmc_host *host);
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index a896595cf575..85dc5b9f4e60 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -885,16 +885,20 @@ static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
}

-static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host)
+static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host)
{
u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
- unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max;
- unsigned int cycles;

val = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT;
- cycles = 1 << (13 + val);
+ return 1 << (13 + val);
+}
+
+static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host)
+{
+ unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max;

- host->mmc->max_busy_timeout = cycles / (clk_rate / MSEC_PER_SEC);
+ host->mmc->max_busy_timeout = host->get_timeout_cycles(host) /
+ (clk_rate / MSEC_PER_SEC);
}

/* Set MMC clock / power.
@@ -1114,6 +1118,9 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
_host->write16_hook = NULL;

+ if (pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT && !_host->get_timeout_cycles)
+ _host->get_timeout_cycles = tmio_mmc_get_timeout_cycles;
+
_host->set_pwr = pdata->set_pwr;

ret = tmio_mmc_init_ocr(_host);
--
2.17.1

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