On 24.07.2018 17:29, Aapo Vienamo wrote:
Implement polling with 10 ms timeout for automatic pad drive strength
calibration.
Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
---
drivers/mmc/host/sdhci-tegra.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index f108c48..e40ca43 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -49,6 +49,9 @@
#define SDHCI_AUTO_CAL_START BIT(31)
#define SDHCI_AUTO_CAL_ENABLE BIT(29)
+#define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec
+#define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31)
Please align the definition value with tabs. Also it looks like the
alignments for the defines here are all over the place, would be nice to
fix those up so they line up.
+
#define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
#define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
#define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2)
@@ -198,13 +201,24 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
{
- u32 val;
+ unsigned timeout = 10;
I prefer "unsigned int" instead of just "unsigned", but I guess that's
just a personal preference..
+ u32 reg;
- mdelay(1);
+ reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
+ reg |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START;
+ sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG);
+ udelay(1);
+
+ do {
+ reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_STATUS);
+ if (!(reg & SDHCI_TEGRA_AUTO_CAL_ACTIVE))
+ break;
+ mdelay(1);
+ timeout--;
+ } while (timeout);
Can we use readl_poll_timeout here? We'll need to calculate the address
directly but it'd still look nicer.
Cheers,
Mikko
- val = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
- val |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START;
- sdhci_writel(host,val, SDHCI_TEGRA_AUTO_CAL_CONFIG);
+ if (timeout == 0)
+ dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n");
}
static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
--
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