From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Andreas_Bie=c3=9fmann?= Date: Sat, 24 Oct 2015 00:49:07 +0200 Subject: [U-Boot] [PATCH 2/4] mmc: atmel: Fix clock configuration In-Reply-To: <1445625991-5343-2-git-send-email-marex@denx.de> References: <1445625991-5343-1-git-send-email-marex@denx.de> <1445625991-5343-2-git-send-email-marex@denx.de> Message-ID: <562AB963.2030004@googlemail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 23.10.15 20:46, Marek Vasut wrote: > After silencing the prints which were generated when reconfiguring the > clock of the SD/MMC bus, surprisingly, the driver stopped working such > that every attempt to use the SD/MMC bus caused the CPU to get totally > stuck hard. It turns out that the prints generated a short delay, which > was necessary for the CPU to reconfigure the clock without getting stuck. > Thus, this patch adds a short delay after the clock configuration instead. > > Signed-off-by: Marek Vasut Reviewed-by: Andreas Bie?mann > --- > drivers/mmc/gen_atmel_mci.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c > index 2815e57..8b05fcd 100644 > --- a/drivers/mmc/gen_atmel_mci.c > +++ b/drivers/mmc/gen_atmel_mci.c > @@ -113,6 +113,8 @@ static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen) > if (mmc->card_caps & mmc->cfg->host_caps & MMC_MODE_HS) > writel(MMCI_BIT(HSMODE), &mci->cfg); > > + udelay(50); > + > initialized = 1; > } > >