From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Boyd Subject: Re: [PATCH RFC 10/12] mmc: mmci: Add clock support for Qualcomm. Date: Mon, 21 Apr 2014 15:20:45 -0700 Message-ID: <535599BD.1020605@codeaurora.org> References: <1398116624-31052-1-git-send-email-srinivas.kandagatla@linaro.org> <1398116945-31640-1-git-send-email-srinivas.kandagatla@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1398116945-31640-1-git-send-email-srinivas.kandagatla@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: srinivas.kandagatla@linaro.org Cc: linux-mmc@vger.kernel.org, Russell King , Chris Ball , Ulf Hansson , linux-kernel@vger.kernel.org, agross@quicinc.com, linux-arm-msm@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org On 04/21/14 14:49, srinivas.kandagatla@linaro.org wrote: > From: Srinivas Kandagatla > > MCICLK going to card bus is directly driven by the clock controller, so the > driver has to set the required rates depending on the state of the card. This > bit of support is very much similar to bypass mode but there is no such thing > called bypass mode in MCICLK register of Qcom SD card controller. By default > the clock is directly driven by the clk controller. > > This patch adds clock support for Qualcomm SDCC in the driver. This bit of > code is conditioned on hw designer. > > Signed-off-by: Srinivas Kandagatla > --- > drivers/mmc/host/mmci.c | 16 ++++++++++++++-- > 1 file changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c > index f465eb5..2cd3a8f 100644 > --- a/drivers/mmc/host/mmci.c > +++ b/drivers/mmc/host/mmci.c > @@ -291,7 +291,18 @@ static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired) > host->cclk = 0; > > if (desired) { > - if (desired >= host->mclk) { > + if (desired != host->mclk && > + host->hw_designer == AMBA_VENDOR_QCOM) { > + /* Qcom MCLKCLK register does not define bypass bits */ > + int rc = clk_set_rate(host->clk, desired); Please turn on lockdep (PROVE_LOCKING) and sleeping while atomic checks (DEBUG_ATOMIC_SLEEP). You cannot call clk_set_rate() in atomic context. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation