@@ -1041,6 +1041,9 @@ int renesas_sdhi_probe(struct platform_device *pdev,
/* All SDHI have SDIO status bits which must be 1 */
mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS;
+ /* All SDHI support HW busy detection */
+ mmc_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT;
+
dev_pm_domain_start(&pdev->dev);
ret = renesas_sdhi_clk_enable(host);
@@ -80,6 +80,8 @@
#define CLK_CTL_SCLKEN BIT(8)
/* Definitions for values the CTL_SD_MEM_CARD_OPT register can take */
+#define CARD_OPT_TOP_MASK 0xf0
+#define CARD_OPT_TOP_SHIFT 4
#define CARD_OPT_WIDTH8 BIT(13)
#define CARD_OPT_WIDTH BIT(15)
@@ -885,6 +885,18 @@ 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)
+{
+ 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);
+
+ host->mmc->max_busy_timeout = cycles / (clk_rate * MSEC_PER_SEC);
+}
+
/* Set MMC clock / power.
* Note: This controller uses a simple divider scheme therefore it cannot
* run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
@@ -943,6 +955,9 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
break;
}
+ if (host->pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT)
+ tmio_mmc_max_busy_timeout(host);
+
/* Let things settle. delay taken from winCE driver */
usleep_range(140, 200);
if (PTR_ERR(host->mrq) == -EINTR)
@@ -586,6 +586,7 @@ static int uniphier_sd_probe(struct platform_device *pdev)
tmio_data = &priv->tmio_data;
tmio_data->flags |= TMIO_MMC_32BIT_DATA_PORT;
+ tmio_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT;
host = tmio_mmc_host_alloc(pdev, tmio_data);
if (IS_ERR(host))
@@ -55,7 +55,12 @@
*/
#define TMIO_MMC_HAS_IDLE_WAIT BIT(4)
-/* BIT(5) is unused */
+/*
+ * Use the busy timeout feature. Probably all TMIO versions support it. Yet,
+ * we don't have documentation for old variants, so we enable only known good
+ * variants with this flag. Can be removed once all variants are known good.
+ */
+#define TMIO_MMC_USE_BUSY_TIMEOUT BIT(5)
/*
* Some controllers have CMD12 automatically
Set max_busy_timeouts for variants known to support the TOPxx bits in the SD_OPTION register. The timeout mechanism was running in the background but not yet properly handled in the driver. So, let the MMC core know when to not use R1B to avoid unhandled timeouts. My datasheets for older variants (tmio_mmc.c) suggest that they support it, too. However, actual bit descriptions are lacking, so I chose an opt-in approach. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> --- drivers/mmc/host/renesas_sdhi_core.c | 3 +++ drivers/mmc/host/tmio_mmc.h | 2 ++ drivers/mmc/host/tmio_mmc_core.c | 15 +++++++++++++++ drivers/mmc/host/uniphier-sd.c | 1 + include/linux/mfd/tmio.h | 7 ++++++- 5 files changed, 27 insertions(+), 1 deletion(-)