From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Beno=C3=AEt=20Th=C3=A9baudeau?= Date: Wed, 3 May 2017 11:59:06 +0200 Subject: [U-Boot] [PATCH 4/4] mx25pdk: Set the eSDHC PER clock to 48 MHz In-Reply-To: <1493805546-3567-1-git-send-email-benoit@wsystem.com> References: <1493805546-3567-1-git-send-email-benoit@wsystem.com> Message-ID: <1493805546-3567-4-git-send-email-benoit@wsystem.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: u-boot@lists.denx.de The maximum SD clock frequency in High Speed mode is 50 MHz. This change makes it possible to get 48 MHz from the USB PLL (240 MHz / 5 / 1) instead of the previous 33.25 MHz from the AHB clock (133 MHz / 2 / 2). Signed-off-by: Benoît Thébaudeau --- board/freescale/mx25pdk/mx25pdk.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/board/freescale/mx25pdk/mx25pdk.c b/board/freescale/mx25pdk/mx25pdk.c index 788d3c3..cab769c 100644 --- a/board/freescale/mx25pdk/mx25pdk.c +++ b/board/freescale/mx25pdk/mx25pdk.c @@ -175,6 +175,12 @@ int board_mmc_init(bd_t *bis) imx_iomux_v3_setup_multiple_pads(sdhc1_pads, ARRAY_SIZE(sdhc1_pads)); + /* + * Set the eSDHC1 PER clock to the maximum frequency lower than or equal + * to 50 MHz that can be obtained, which requires to use UPLL as the + * clock source. This actually gives 48 MHz. + */ + imx_set_perclk(MXC_ESDHC1_CLK, true, 50000000); esdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC1_CLK); return fsl_esdhc_initialize(bis, &esdhc_cfg[0]); } -- 2.7.4