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[PATCH 1/3] mmc: core: Allow hosts to specify non-support for MMC commands

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Host drivers which needs to valdiate for non-supported MMC
commands and returnn error code for such requests.

To improve and simplify the behaviour, let's invent MMC_CAP2_NO_MMC
which these host drivers can set to tell the mmc core to skip sending MMC
commands during card initialization.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

---

 drivers/mmc/core/core.c  | 5 +++--
 include/linux/mmc/host.h | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 4c823df..94cbf4e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2510,8 +2510,9 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
 		if (!mmc_attach_sd(host))
 			return 0;
 
-	if (!mmc_attach_mmc(host))
-		return 0;
+	if (!(host->caps2 & MMC_CAP2_NO_MMC))
+		if (!mmc_attach_mmc(host))
+			return 0;
 
 	mmc_power_off(host);
 	return -EIO;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c22476d..aa4bfbf 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -310,6 +310,7 @@ struct mmc_host {
 #define MMC_CAP2_NO_SDIO	(1 << 19)	/* Do not send SDIO commands during initialization */
 #define MMC_CAP2_HS400_ES	(1 << 20)	/* Host supports enhanced strobe */
 #define MMC_CAP2_NO_SD		(1 << 21)	/* Do not send SD commands during initialization */
+#define MMC_CAP2_NO_MMC		(1 << 22)	/* Do not send (e)MMC commands during initialization */
 
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
-- 
2.3.7

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Thread

[PATCH 0/3] Expose new mmc caps to DT Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-01 09:50 +0200
  [PATCH 3/3] Documentation: mmc: add description for new no-sd* and no-mmc Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-01 09:50 +0200
  [PATCH 2/3] mmc: core: expose MMC_CAP2_NO_* to dt Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-01 09:50 +0200
  [PATCH 1/3] mmc: core: Allow hosts to specify non-support for MMC commands Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-01 09:50 +0200
    Re: [PATCH 1/3] mmc: core: Allow hosts to specify non-support for MMC commands Ulf Hansson <ulf.hansson@linaro.org> - 2016-07-06 18:30 +0200

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