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mmc: sdhci-esdhc-imx: add strobe-dll-delay-target support

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strobe-dll-delay-target is the delay cell add on the strobe line.
Strobe line the the uSDHC loopback read clock which is use in HS400
mode. Different strobe-dll-delay-target may need to set for different
board/SoC. If this delay cell is not set to an appropriate value,
we may see some read operation meet CRC error after HS400 mode select
which already pass the tuning.

This patch add the strobe-dll-delay-target setting in driver, so that
user can easily config this delay cell in dts file.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1582100757-20683-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Haibo Chen
2020-02-19 16:25:49 +08:00
committed by Ulf Hansson
parent 0299138af6
commit 5bd2acdcdd
2 changed files with 12 additions and 1 deletions
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include/linux/platform_data/mmc-esdhc-imx.h
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@@ -37,5 +37,6 @@ struct esdhc_platform_data {
unsigned int delay_line;
unsigned int tuning_step; /* The delay cell steps in tuning procedure */
unsigned int tuning_start_tap; /* The start delay cell point in tuning procedure */
unsigned int strobe_dll_delay_target; /* The delay cell for strobe pad (read clock) */
};
#endif /* __ASM_ARCH_IMX_ESDHC_H */