[PATCH V2 24/27] mmc: mmci: add clock divider for stm32 sdmmc

Ludovic Barre ludovic.Barre at st.com
Tue Sep 18 03:55:41 PDT 2018


From: Ludovic Barre <ludovic.barre at st.com>

The STM32 sdmmc variant has a different clock divider.

Signed-off-by: Ludovic Barre <ludovic.barre at 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 6b3c33f..d622fbb 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1834,6 +1834,8 @@ 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 2d46a08..dcb1255 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
@@ -270,6 +271,7 @@ struct variant_data {
 	bool			datacnt_useless;
 	bool			st_sdio;
 	bool			st_clkdiv;
+	bool			stm32_clkdiv;
 	bool			blksz_datactrl16;
 	bool			blksz_datactrl4;
 	u32			pwrreg_powerup;
-- 
2.7.4




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