From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 046B9156E5 for ; Wed, 25 Oct 2023 15:41:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lI4Q9Gwo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C50CC433C8; Wed, 25 Oct 2023 15:41:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698248503; bh=PzjgKpSa57giPfmrowGoMAs62Cov+6nezTmGkieIMeQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=lI4Q9GwoRePYdEq52N3c61EeIRpMkDTqi5iRFrMExTJTacyDIyN9YPfehym+0288I QYIJ6qIdPhPbIp3fNIKVMoZf7yx8kdD6htozlwjc0THS4jEU3HFGUivXVYCuRRBmz7 5lcLSeXaK9Jrfz9JBYeXauXCbAgNO9kq9obW3jJdOBtxOH2GJ+Q6PxsUxMtF8NinKT PjojuRheRm6QfWUoTeUtl8wFLWHfvEIFhe/XISifpZfKoTsuf0FTBvplwLdSCE/fMs N97EJD4KeRscOI/Em55RnBO+fPYO+KFd58sQ/W+Zt8az7zQHWfYR/RUY5gpruGryMf BxZTSRD41fw+g== Date: Wed, 25 Oct 2023 23:29:25 +0800 From: Jisheng Zhang To: Drew Fustini Cc: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Adrian Hunter , Guo Ren , Fu Wei , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Robert Nelson , Jason Kridner , Xi Ruoyao , Han Gao , Icenowy Zheng , linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v3 2/7] mmc: sdhci: add __sdhci_execute_tuning() to header Message-ID: References: <20231023-th1520-mmc-v3-0-abc5e7491166@baylibre.com> <20231023-th1520-mmc-v3-2-abc5e7491166@baylibre.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20231023-th1520-mmc-v3-2-abc5e7491166@baylibre.com> On Mon, Oct 23, 2023 at 02:07:03PM -0700, Drew Fustini wrote: > Expose __sdhci_execute_tuning() so that it can be called from the > mmc host controller drivers. > > In the sdhci-of-dwcmshc driver, sdhci_dwcmshc_th1520_ops sets > platform_execute_tuning to th1520_execute_tuning(). That function has Hi Drew, Just FYI, my th1520 version patch in my local repo overrides the mmc_host_ops.execute_tuning as the following: host->mmc_host_ops.execute_tuning = dwcmshc_execute_tuning; In dwcmshc_execute_tuning(), I will do some necessary setting then call sdhci_execute_tuning(); So I don't need to export __sdhci_execute_tuning(). The main reason is that the __abc symbol is expected to be used internally. However, I have no big preference. I would leave the decision be made by mmc maintainers @Ulf @Adrian, can you please comment? Thanks > to manipulate phy registers before tuning can be performed. To avoid > copying the code verbatim from __sdhci_execute_tuning() into > th1520_execute_tuning(), make it possible for __sdhci_execute_tuning() > to be called from sdhci-of-dwcmshc. > > Signed-off-by: Drew Fustini > --- > drivers/mmc/host/sdhci.c | 3 ++- > drivers/mmc/host/sdhci.h | 1 + > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index ff41aa56564e..c79f73459915 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -2841,7 +2841,7 @@ void sdhci_send_tuning(struct sdhci_host *host, u32 opcode) > } > EXPORT_SYMBOL_GPL(sdhci_send_tuning); > > -static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) > +int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) > { > int i; > > @@ -2879,6 +2879,7 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) > sdhci_reset_tuning(host); > return -EAGAIN; > } > +EXPORT_SYMBOL_GPL(__sdhci_execute_tuning); > > int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) > { > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index f219bdea8f28..a20864fc0641 100644 > --- a/drivers/mmc/host/sdhci.h > +++ b/drivers/mmc/host/sdhci.h > @@ -793,6 +793,7 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width); > void sdhci_reset(struct sdhci_host *host, u8 mask); > void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing); > int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode); > +int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode); > void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); > int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, > struct mmc_ios *ios); > > -- > 2.34.1 >