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authorJerome Brunet <jbrunet@baylibre.com>2019-04-23 11:02:32 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2019-05-06 11:55:39 +0200
commitd5f758f2df8015b8dcf47b6403cc192e4cef734d (patch)
treef09c079e8964b5b3a6fcb76a43bd0049c0316539 /drivers/mmc
parenteb4d811277465784e2d25d74c19183295d4499ab (diff)
downloadlinux-d5f758f2df8015b8dcf47b6403cc192e4cef734d.tar.bz2
mmc: meson-gx: disable HS400
At the moment, all our attempts to enable HS400 on Amlogic chipsets have been unsuccessful or unreliable. Until we can figure out how to enable this mode safely and reliably, let's force it off. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/meson-gx-mmc.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 3df50b53f834..118f09da8dfb 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -823,10 +823,6 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (meson_mmc_timing_is_ddr(ios))
val |= CFG_DDR;
- val &= ~CFG_CHK_DS;
- if (ios->timing == MMC_TIMING_MMC_HS400)
- val |= CFG_CHK_DS;
-
err = meson_mmc_clk_set(host, ios);
if (err)
dev_err(host->dev, "Failed to set clock: %d\n,", err);
@@ -1339,6 +1335,13 @@ static int meson_mmc_probe(struct platform_device *pdev)
mmc->max_segs = SD_EMMC_DESC_BUF_LEN / sizeof(struct sd_emmc_desc);
mmc->max_seg_size = mmc->max_req_size;
+ /*
+ * At the moment, we don't know how to reliably enable HS400.
+ * From the different datasheets, it is not even clear if this mode
+ * is officially supported by any of the SoCs
+ */
+ mmc->caps2 &= ~MMC_CAP2_HS400;
+
/* data bounce buffer */
host->bounce_buf_size = mmc->max_req_size;
host->bounce_buf =