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Subject[PATCH V5 21/24] mmc: mmci: add clock divider for stm32 sdmmc
Date
From: Ludovic Barre <ludovic.barre@st.com>

The STM32 sdmmc variant has a different clock divider.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
drivers/mmc/host/mmci.c | 2 ++
drivers/mmc/host/mmci.h | 2 ++
2 files changed, 4 insertions(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 72d16a3..6115c71 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1856,6 +1856,8 @@ static int mmci_probe(struct amba_device *dev,
*/
if (variant->st_clkdiv)
mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
+ else if (variant->stm32_clkdiv)
+ mmc->f_min = DIV_ROUND_UP(host->mclk, 2046);
else if (variant->explicit_mclk_control)
mmc->f_min = clk_round_rate(host->clk, 100000);
else
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 84a24ea..e2ea8a5 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -216,6 +216,7 @@ struct mmci_host;
* @data_cmd_enable: enable value for data commands.
* @st_sdio: enable ST specific SDIO logic
* @st_clkdiv: true if using a ST-specific clock divider algorithm
+ * @stm32_clkdiv: true if using a STM32-specific clock divider algorithm
* @datactrl_mask_ddrmode: ddr mode mask in datactrl register.
* @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
* @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl
@@ -269,6 +270,7 @@ struct variant_data {
u8 datacnt_useless:1;
u8 st_sdio:1;
u8 st_clkdiv:1;
+ u8 stm32_clkdiv:1;
u8 blksz_datactrl16:1;
u8 blksz_datactrl4:1;
u32 pwrreg_powerup;
--
2.7.4
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