From 1f44a2a55787faa08a50266fa5dc99f0dcd36b7c Mon Sep 17 00:00:00 2001 From: Seungwon Jeon Date: Sat, 31 Aug 2013 00:13:31 +0900 Subject: mmc: dw_mmc: set the supported max/min frequency Both f_max and f_min will be informed for core layer to request valid clock rate. But current setting from 'host->bus_hz' may not represent the max/min frequency properly. Even if host can actually support high speed than bus_hz, core layer will not request clock rate over bus_hz. Basically, f_max/f_min can be set with the values according to spec. And then host will make its best effort to meet the rate. Signed-off-by: Seungwon Jeon Tested-by: Alim Akhtar Signed-off-by: Chris Ball --- drivers/mmc/host/dw_mmc.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'drivers/mmc/host/dw_mmc.c') diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index cca9aa6b11c5..50da6e330a15 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -50,6 +50,9 @@ #define DW_MCI_RECV_STATUS 2 #define DW_MCI_DMA_THRESHOLD 16 +#define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */ +#define DW_MCI_FREQ_MIN 400000 /* unit: HZ */ + #ifdef CONFIG_MMC_DW_IDMAC #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \ SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \ @@ -1936,6 +1939,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id) struct dw_mci_slot *slot; const struct dw_mci_drv_data *drv_data = host->drv_data; int ctrl_id, ret; + u32 freq[2]; u8 bus_width; mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev); @@ -1951,8 +1955,14 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id) slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id); mmc->ops = &dw_mci_ops; - mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510); - mmc->f_max = host->bus_hz; + if (of_property_read_u32_array(host->dev->of_node, + "clock-freq-min-max", freq, 2)) { + mmc->f_min = DW_MCI_FREQ_MIN; + mmc->f_max = DW_MCI_FREQ_MAX; + } else { + mmc->f_min = freq[0]; + mmc->f_max = freq[1]; + } if (host->pdata->get_ocr) mmc->ocr_avail = host->pdata->get_ocr(id); -- cgit v1.2.3