From: jh80.chung@samsung•com (Jaehoon Chung)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 2/3] mmc: dw_mmc: simplify the SDMMC_CLKEN_LOW_PWR logic
Date: Mon, 17 Aug 2015 10:55:19 +0900 [thread overview]
Message-ID: <55D13F07.70309@samsung.com> (raw)
In-Reply-To: <3d03bfe2c18789eefa038018467c9c63c94ae4a2.1439381423.git.hramrach@gmail.com>
Hi, Michal.
On 08/12/2015 09:23 PM, Michal Suchanek wrote:
> The driver has open-coded test for SDIO cards. Use the mmc core provided
> MMC_QUIRK_BROKEN_CLK_GATING flag instead.
Did you use the clock-gating for SDIO cards?
Doesn't MMC_CAP_SDIO_IRQ bit set? Which case is broken?
Could you explain to me more?
Best Regards,
Jaehoon Chung
>
> As a bonus this may enable clock gating on SDIO cards that are known to
> work with it.
>
> Signed-off-by: Michal Suchanek <hramrach@gmail•com>
> ---
> drivers/mmc/host/dw_mmc.c | 33 +++++++++++++++------------------
> 1 file changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 40e9d8e..3bc9fd7 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1335,27 +1335,24 @@ static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
> * description of the CLKENA register we should disable low power mode
> * for SDIO cards if we need SDIO interrupts to work.
> */
> - if (mmc->caps & MMC_CAP_SDIO_IRQ) {
> - const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
> - u32 clk_en_a_old;
> - u32 clk_en_a;
> + const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
> + u32 clk_en_a_old;
> + u32 clk_en_a;
>
> - clk_en_a_old = mci_readl(host, CLKENA);
> + clk_en_a_old = mci_readl(host, CLKENA);
>
> - if (card->type == MMC_TYPE_SDIO ||
> - card->type == MMC_TYPE_SD_COMBO) {
> - set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
> - clk_en_a = clk_en_a_old & ~clken_low_pwr;
> - } else {
> - clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
> - clk_en_a = clk_en_a_old | clken_low_pwr;
> - }
> + if (card->quirks & MMC_QUIRK_BROKEN_CLK_GATING) {
> + set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
> + clk_en_a = clk_en_a_old & ~clken_low_pwr;
> + } else {
> + clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
> + clk_en_a = clk_en_a_old | clken_low_pwr;
> + }
>
> - if (clk_en_a != clk_en_a_old) {
> - mci_writel(host, CLKENA, clk_en_a);
> - mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
> - SDMMC_CMD_PRV_DAT_WAIT, 0);
> - }
> + if (clk_en_a != clk_en_a_old) {
> + mci_writel(host, CLKENA, clk_en_a);
> + mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
> + SDMMC_CMD_PRV_DAT_WAIT, 0);
> }
> }
>
>
next prev parent reply other threads:[~2015-08-17 1:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-12 12:10 [PATCH 0/3] misc MMC fixes Michal Suchanek
2015-08-12 12:23 ` [PATCH resend 1/3] mmc: sunxi: fix timeout in sunxi_mmc_oclk_onoff michal.suchanek at ruk.cuni.cz
2015-08-12 12:32 ` Hans de Goede
2015-08-12 12:40 ` [linux-sunxi] " Olliver Schinagl
2015-08-12 13:04 ` Michal Suchanek
2015-08-12 13:29 ` [PATCH v3 " Michal Suchanek
2015-08-12 14:49 ` [linux-sunxi] " Hans de Goede
2015-08-25 12:06 ` Ulf Hansson
2015-08-12 12:23 ` [PATCH 2/3] mmc: dw_mmc: simplify the SDMMC_CLKEN_LOW_PWR logic Michal Suchanek
2015-08-17 1:55 ` Jaehoon Chung [this message]
2015-08-17 5:52 ` Michal Suchanek
2015-08-17 11:26 ` Jaehoon Chung
2015-08-17 14:42 ` Alim Akhtar
2015-08-17 14:55 ` Michal Suchanek
2015-08-17 16:21 ` Alim Akhtar
2015-08-12 12:23 ` [PATCH 3/3] mmc: sunxi: use controller automatic clock gating Michal Suchanek
2015-08-12 12:35 ` [linux-sunxi] " Hans de Goede
2015-08-12 12:53 ` Michal Suchanek
2015-08-12 13:19 ` Olliver Schinagl
2015-08-12 13:37 ` Michal Suchanek
2015-08-12 14:57 ` Olliver Schinagl
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