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authorYinbo Zhu <yinbo.zhu@nxp.com>2018-11-23 11:15:33 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 08:26:24 +0100
commitcc14eec0889bb06abab3d6ea1e0e0676521542c8 (patch)
tree67554ff20919840d9e3f52c172144850d1f608ae /include/linux/mmc
parent52b5f5cfa2f736f3e478b65490736b62412dc11c (diff)
mmc: core: Add ->hs400_prepare_ddr() callback
Some eMMC controllers need specific settings for HS400 mode before the speed mode can be switched to DDR mode, during the HS400 initialization sequence. For that reason, let's introduce a new host callback, ->hs400_prepare_ddr() and invoked it just before switching to DDR mode. Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'include/linux/mmc')
-rw-r--r--include/linux/mmc/host.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 2a5fe75dd082..2709c94d9d86 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -147,6 +147,9 @@ struct mmc_host_ops {
/* Prepare HS400 target operating frequency depending host driver */
int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);
+ /* Prepare switch to DDR during the HS400 init sequence */
+ int (*hs400_prepare_ddr)(struct mmc_host *host);
+
/* Prepare for switching from HS400 to HS200 */
void (*hs400_downgrade)(struct mmc_host *host);