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Date: Mon, 24 Jun 2019 15:22:41 +0000
From: <Nicolas.Ferre@...rochip.com>
To: <palmer@...ive.com>, <harini.katakam@...inx.com>
CC: <davem@...emloft.net>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <michal.simek@...inx.com>
Subject: Re: [PATCH 1/2] net: macb: Fix compilation on systems without
COMMON_CLK
On 24/06/2019 at 11:57, Palmer Dabbelt wrote:
> External E-Mail
>
>
> On Mon, 24 Jun 2019 02:40:21 PDT (-0700), Nicolas.Ferre@...rochip.com wrote:
>> On 24/06/2019 at 08:16, Palmer Dabbelt wrote:
>>> External E-Mail
>>>
>>>
>>> The patch to add support for the FU540-C000 added a dependency on
>>> COMMON_CLK, but didn't express that via Kconfig. This fixes the build
>>> failure by adding CONFIG_MACB_FU540, which depends on COMMON_CLK and
>>> conditionally enables the FU540-C000 support.
>>
>> Let's try to limit the use of #ifdef's throughout the code. We are
>> using them in this driver but only for the hot paths and things that
>> have an impact on performance. I don't think it's the case here: so
>> please find another option => NACK.
>
> OK. Would you accept adding a Kconfig dependency of the generic MACB driver on
> COMMON_CLK, as suggested in the cover letter?
Yes: all users of this peripheral have COMMON_CLK set.
You can remove it from the PCI wrapper then.
Best regards,
Nicolas
>>> I've built this with a powerpc allyesconfig (which pointed out the bug)
>>> and on RISC-V, manually checking to ensure the code was built. I
>>> haven't even booted the resulting kernels.
>>>
>>> Fixes: c218ad559020 ("macb: Add support for SiFive FU540-C000")
>>> Signed-off-by: Palmer Dabbelt <palmer@...ive.com>
>>> ---
>>> drivers/net/ethernet/cadence/Kconfig | 11 +++++++++++
>>> drivers/net/ethernet/cadence/macb_main.c | 12 ++++++++++++
>>> 2 files changed, 23 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/cadence/Kconfig b/drivers/net/ethernet/cadence/Kconfig
>>> index 1766697c9c5a..74ee2bfd2369 100644
>>> --- a/drivers/net/ethernet/cadence/Kconfig
>>> +++ b/drivers/net/ethernet/cadence/Kconfig
>>> @@ -40,6 +40,17 @@ config MACB_USE_HWSTAMP
>>> ---help---
>>> Enable IEEE 1588 Precision Time Protocol (PTP) support for MACB.
>>>
>>> +config MACB_FU540
>>> + bool "Enable support for the SiFive FU540 clock controller"
>>> + depends on MACB && COMMON_CLK
>>> + default y
>>> + ---help---
>>> + Enable support for the MACB/GEM clock controller on the SiFive
>>> + FU540-C000. This device is necessary for switching between 10/100
>>> + and gigabit modes on the FU540-C000 SoC, without which it is only
>>> + possible to bring up the Ethernet link in whatever mode the
>>> + bootloader probed.
>>> +
>>> config MACB_PCI
>>> tristate "Cadence PCI MACB/GEM support"
>>> depends on MACB && PCI && COMMON_CLK
>>> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
>>> index c545c5b435d8..a903dfdd4183 100644
>>> --- a/drivers/net/ethernet/cadence/macb_main.c
>>> +++ b/drivers/net/ethernet/cadence/macb_main.c
>>> @@ -41,6 +41,7 @@
>>> #include <linux/pm_runtime.h>
>>> #include "macb.h"
>>>
>>> +#ifdef CONFIG_MACB_FU540
>>> /* This structure is only used for MACB on SiFive FU540 devices */
>>> struct sifive_fu540_macb_mgmt {
>>> void __iomem *reg;
>>> @@ -49,6 +50,7 @@ struct sifive_fu540_macb_mgmt {
>>> };
>>>
>>> static struct sifive_fu540_macb_mgmt *mgmt;
>>> +#endif
>>>
>>> #define MACB_RX_BUFFER_SIZE 128
>>> #define RX_BUFFER_MULTIPLE 64 /* bytes */
>>> @@ -3956,6 +3958,7 @@ static int at91ether_init(struct platform_device *pdev)
>>> return 0;
>>> }
>>>
>>> +#ifdef CONFIG_MACB_FU540
>>> static unsigned long fu540_macb_tx_recalc_rate(struct clk_hw *hw,
>>> unsigned long parent_rate)
>>> {
>>> @@ -4056,7 +4059,9 @@ static int fu540_c000_init(struct platform_device *pdev)
>>>
>>> return macb_init(pdev);
>>> }
>>> +#endif
>>>
>>> +#ifdef CONFIG_MACB_FU540
>>> static const struct macb_config fu540_c000_config = {
>>> .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
>>> MACB_CAPS_GEM_HAS_PTP,
>>> @@ -4065,6 +4070,7 @@ static const struct macb_config fu540_c000_config = {
>>> .init = fu540_c000_init,
>>> .jumbo_max_len = 10240,
>>> };
>>> +#endif
>>>
>>> static const struct macb_config at91sam9260_config = {
>>> .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
>>> @@ -4155,7 +4161,9 @@ static const struct of_device_id macb_dt_ids[] = {
>>> { .compatible = "cdns,emac", .data = &emac_config },
>>> { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
>>> { .compatible = "cdns,zynq-gem", .data = &zynq_config },
>>> +#ifdef CONFIG_MACB_FU540
>>> { .compatible = "sifive,fu540-macb", .data = &fu540_c000_config },
>>> +#endif
>>> { /* sentinel */ }
>>> };
>>> MODULE_DEVICE_TABLE(of, macb_dt_ids);
>>> @@ -4363,7 +4371,9 @@ static int macb_probe(struct platform_device *pdev)
>>>
>>> err_disable_clocks:
>>> clk_disable_unprepare(tx_clk);
>>> +#ifdef CONFIG_MACB_FU540
>>> clk_unregister(tx_clk);
>>> +#endif
>>> clk_disable_unprepare(hclk);
>>> clk_disable_unprepare(pclk);
>>> clk_disable_unprepare(rx_clk);
>>> @@ -4398,7 +4408,9 @@ static int macb_remove(struct platform_device *pdev)
>>> pm_runtime_dont_use_autosuspend(&pdev->dev);
>>> if (!pm_runtime_suspended(&pdev->dev)) {
>>> clk_disable_unprepare(bp->tx_clk);
>>> +#ifdef CONFIG_MACB_FU540
>>> clk_unregister(bp->tx_clk);
>>> +#endif
>>> clk_disable_unprepare(bp->hclk);
>>> clk_disable_unprepare(bp->pclk);
>>> clk_disable_unprepare(bp->rx_clk);
>>>
>>
>>
>> --
>> Nicolas Ferre
--
Nicolas Ferre
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