From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Serge Semin <fancer.lancer@gmail.com>
Cc: "Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Marek Vasut" <marek.vasut+renesas@gmail.com>,
"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-renesas-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
mhi@lists.linux.dev, "Siddharth Vadapalli" <s-vadapalli@ti.com>,
"Frank Li" <Frank.Li@nxp.com>
Subject: Re: [PATCH v4 1/5] PCI: dwc: Refactor dw_pcie_edma_find_chip() API
Date: Mon, 18 Mar 2024 10:59:02 +0530 [thread overview]
Message-ID: <20240318052902.GD2748@thinkpad> (raw)
In-Reply-To: <flwmqlr3irjuwfqpjn227qnrkyyayym57d5v3ksr4xqmfxshaj@ibdi3dyetkou>
On Tue, Mar 12, 2024 at 12:04:17PM +0300, Serge Semin wrote:
> Hi Mani
>
> On Wed, Mar 06, 2024 at 03:51:57PM +0530, Manivannan Sadhasivam wrote:
> > In order to add support for Hyper DMA (HDMA), let's refactor the existing
> > dw_pcie_edma_find_chip() API by moving the common code to separate
> > functions.
> >
> > No functional change.
> >
> > Suggested-by: Serge Semin <fancer.lancer@gmail.com>
> > Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
> > Reviewed-by: Frank Li <Frank.Li@nxp.com>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> > drivers/pci/controller/dwc/pcie-designware.c | 40 +++++++++++++++++++++++-----
> > 1 file changed, 33 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index 250cf7f40b85..3a26dfc5368f 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -880,7 +880,17 @@ static struct dw_edma_plat_ops dw_pcie_edma_ops = {
> > .irq_vector = dw_pcie_edma_irq_vector,
> > };
> >
> > -static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
> > +static void dw_pcie_edma_init_data(struct dw_pcie *pci)
> > +{
> > + pci->edma.dev = pci->dev;
> > +
> > + if (!pci->edma.ops)
> > + pci->edma.ops = &dw_pcie_edma_ops;
> > +
> > + pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
> > +}
> > +
> > +static int dw_pcie_edma_find_mf(struct dw_pcie *pci)
> > {
> > u32 val;
> >
> > @@ -902,8 +912,6 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
> >
> > if (val == 0xFFFFFFFF && pci->edma.reg_base) {
> > pci->edma.mf = EDMA_MF_EDMA_UNROLL;
> > -
> > - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
> > } else if (val != 0xFFFFFFFF) {
> > pci->edma.mf = EDMA_MF_EDMA_LEGACY;
> >
> > @@ -912,12 +920,17 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
> > return -ENODEV;
> > }
> >
> > - pci->edma.dev = pci->dev;
> > + return 0;
> > +}
> >
> > - if (!pci->edma.ops)
> > - pci->edma.ops = &dw_pcie_edma_ops;
> > +static int dw_pcie_edma_find_channels(struct dw_pcie *pci)
> > +{
> > + u32 val;
> >
>
> > - pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
> > + if (pci->edma.mf == EDMA_MF_EDMA_LEGACY)
> > + val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL);
> > + else
> > + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
>
> Once again:
>
> On Tue, Feb 27, 2024 at 01:04:55PM +0530, Manivannan Sadhasivam wrote:
> > On Tue, Feb 27, 2024 at 12:00:41AM +0300, Serge Semin wrote:
> > > The entire
> > >
> > > + if (pci->edma.mf == EDMA_MF_EDMA_LEGACY)
> > > + val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL);
> > > + else
> > > + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
> > >
> > > can be replaced with a single line
> > >
> > > + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
> > >
> > > since in the legacy case (reg_base = PCIE_DMA_VIEWPORT_BASE) the
> > > pci->edma.reg_base has been initialized by now.
> > >
> >
> > Ah okay, got it!
>
Sorry, I had this change but looks like it got lost during rebase somehow. Will
bring it back.
- Mani
--
மணிவண்ணன் சதாசிவம்
next prev parent reply other threads:[~2024-03-18 5:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 10:21 [PATCH v4 0/5] PCI: dwc: Add support for integrating HDMA with DWC EP driver Manivannan Sadhasivam
2024-03-06 10:21 ` [PATCH v4 1/5] PCI: dwc: Refactor dw_pcie_edma_find_chip() API Manivannan Sadhasivam
2024-03-08 11:41 ` Yoshihiro Shimoda
2024-03-12 9:04 ` Serge Semin
2024-03-18 5:29 ` Manivannan Sadhasivam [this message]
2024-03-06 10:21 ` [PATCH v4 2/5] PCI: dwc: Skip finding eDMA channels count for HDMA platforms Manivannan Sadhasivam
2024-03-08 11:42 ` Yoshihiro Shimoda
2024-03-12 9:17 ` Serge Semin
2024-03-18 5:34 ` Manivannan Sadhasivam
2024-03-06 10:21 ` [PATCH v4 3/5] PCI: dwc: Pass the eDMA mapping format flag directly from glue drivers Manivannan Sadhasivam
2024-03-08 11:45 ` Yoshihiro Shimoda
2024-03-06 10:22 ` [PATCH v4 4/5] PCI: qcom-ep: Add HDMA support for SA8775P SoC Manivannan Sadhasivam
2024-03-06 10:22 ` [PATCH v4 5/5] PCI: epf-mhi: Enable HDMA " Manivannan Sadhasivam
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