Commit c4313e75 authored by Peter Geis's avatar Peter Geis Committed by Ulf Hansson
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mmc: dw_mmc: Support setting f_min from host drivers 



Host drivers may not be able to support frequencies as low as dw-mmc
supports. Unfortunately f_min isn't available when the drv_data->init
function is called, as the mmc_host struct hasn't been set up yet.

Support the host drivers saving the requested minimum frequency, so we
can later set f_min when it is available.

Signed-off-by: default avatarPeter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20220305215835.2210388-2-pgwipeout@gmail.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 0ffd498d

drivers/mmc/host/dw_mmc.c

+6 −1
Original line number Diff line number Diff line
@@ -2898,7 +2898,12 @@ static int dw_mci_init_slot_caps(struct dw_mci_slot *slot) 
	if (host->pdata->caps2)

		mmc->caps2 = host->pdata->caps2;



	/* if host has set a minimum_freq, we should respect it */

	if (host->minimum_speed)

		mmc->f_min = host->minimum_speed;

	else

		mmc->f_min = DW_MCI_FREQ_MIN;



	if (!mmc->f_max)

		mmc->f_max = DW_MCI_FREQ_MAX;

drivers/mmc/host/dw_mmc.h

+2 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ struct dw_mci_dma_slave { 
 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus

 *	rate and timeout calculations.

 * @current_speed: Configured rate of the controller.

 * @minimum_speed: Stored minimum rate of the controller.

 * @fifoth_val: The value of FIFOTH register.

 * @verid: Denote Version ID.

 * @dev: Device associated with the MMC controller.
@@ -201,6 +202,7 @@ struct dw_mci { 


	u32			bus_hz;

	u32			current_speed;

	u32			minimum_speed;

	u32			fifoth_val;

	u16			verid;

	struct device		*dev;