mirror of
https://github.com/Ysurac/openmptcprouter.git
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54 lines
1.9 KiB
Diff
54 lines
1.9 KiB
Diff
From c4313e75001492f8a288d3ffd595544cbc880821 Mon Sep 17 00:00:00 2001
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From: Peter Geis <pgwipeout@gmail.com>
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Date: Sat, 5 Mar 2022 16:58:34 -0500
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Subject: [PATCH] mmc: dw_mmc: Support setting f_min from host drivers
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Host drivers may not be able to support frequencies as low as dw-mmc
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supports. Unfortunately f_min isn't available when the drv_data->init
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function is called, as the mmc_host struct hasn't been set up yet.
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Support the host drivers saving the requested minimum frequency, so we
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can later set f_min when it is available.
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Signed-off-by: Peter Geis <pgwipeout@gmail.com>
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Link: https://lore.kernel.org/r/20220305215835.2210388-2-pgwipeout@gmail.com
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Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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---
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drivers/mmc/host/dw_mmc.c | 7 ++++++-
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drivers/mmc/host/dw_mmc.h | 2 ++
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2 files changed, 8 insertions(+), 1 deletion(-)
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--- a/drivers/mmc/host/dw_mmc.c
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+++ b/drivers/mmc/host/dw_mmc.c
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@@ -2853,7 +2853,12 @@ static int dw_mci_init_slot_caps(struct
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if (host->pdata->caps2)
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mmc->caps2 = host->pdata->caps2;
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- mmc->f_min = DW_MCI_FREQ_MIN;
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+ /* if host has set a minimum_freq, we should respect it */
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+ if (host->minimum_speed)
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+ mmc->f_min = host->minimum_speed;
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+ else
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+ mmc->f_min = DW_MCI_FREQ_MIN;
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+
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if (!mmc->f_max)
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mmc->f_max = DW_MCI_FREQ_MAX;
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--- a/drivers/mmc/host/dw_mmc.h
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+++ b/drivers/mmc/host/dw_mmc.h
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@@ -99,6 +99,7 @@ struct dw_mci_dma_slave {
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* @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
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* rate and timeout calculations.
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* @current_speed: Configured rate of the controller.
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+ * @minimum_speed: Stored minimum rate of the controller.
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* @fifoth_val: The value of FIFOTH register.
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* @verid: Denote Version ID.
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* @dev: Device associated with the MMC controller.
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@@ -200,6 +201,7 @@ struct dw_mci {
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u32 bus_hz;
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u32 current_speed;
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+ u32 minimum_speed;
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u32 fifoth_val;
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u16 verid;
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struct device *dev;
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