mmc: Allow the platform to specify the sh_mmcif get_cd handler (777271d0) · Commits · 戴 / test

In some platforms (e.g. AP4EVB) the card detect pin of a slot is not directly connected to the sh_mmcif controller, so that polling needs to be used. To overcome the overhead induced by querying the controller on each poll cycle, card detection can be handled in the platform code more efficiently. This patch exposes a get_cd hook for that purpose. Signed-off-by:

Arnd Hannemann <arnd@arndnet.de> Tested-by:

Yusuke Goda <yusuke.goda.sx@renesas.com> Signed-off-by:

Samuel Ortiz <sameo@linux.intel.com>

drivers/mmc/host/sh_mmcif.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -710,9 +710,21 @@ static void sh_mmcif_set_ios(struct mmc_host mmc, struct mmc_ios ios)
		host->bus_width = ios->bus_width;
		}

		static int sh_mmcif_get_cd(struct mmc_host *mmc)
		{
		struct sh_mmcif_host *host = mmc_priv(mmc);
		struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;

		if (!p->get_cd)
		return -ENOSYS;
		else
		return p->get_cd(host->pd);
		}

		static struct mmc_host_ops sh_mmcif_ops = {
		.request = sh_mmcif_request,
		.set_ios = sh_mmcif_set_ios,
		.get_cd = sh_mmcif_get_cd,
		};

		static void sh_mmcif_detect(struct mmc_host *mmc)

include/linux/mmc/sh_mmcif.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,7 @@
		struct sh_mmcif_plat_data {
		void (set_pwr)(struct platform_device pdev, int state);
		void (down_pwr)(struct platform_device pdev);
		int (get_cd)(struct platform_device pdef);
		u8 sup_pclk; /* 1 :SH7757, 0: SH7724/SH7372 */
		unsigned long caps;
		u32 ocr;

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