Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-18 02:46:06 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

mmc: dw_mmc: Support setting f_min from host drivers

Browse Source 
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: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20220305215835.2210388-2-pgwipeout@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Geis 2022-03-05 16:58:34 -05:00 committed by Ulf Hansson
parent 0ffd498db1
commit c4313e7500
2 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/mmc/host/dw_mmc.c
View File

@ -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;
mmc->f_min = DW_MCI_FREQ_MIN;
/* 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;

2
drivers/mmc/host/dw_mmc.h
View File

@ -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;