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Message-ID: <549e6adc-73c1-aa03-93dc-578138729750@gmail.com>
Date: Wed, 18 Apr 2018 17:06:52 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: sean.wang@...iatek.com, robh+dt@...nel.org, mark.rutland@....com,
marcel@...tmann.org, johan.hedberg@...il.com
Cc: devicetree@...r.kernel.org, linux-bluetooth@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
Ulf Hansson <ulf.hansson@...aro.org>,
Weiyi Lu <weiyi.lu@...iatek.com>
Subject: Re: [PATCH v1 3/7] soc: mediatek: reuse read[l,x]_poll_timeout
helpers
On 04/03/2018 09:15 AM, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
>
> Reuse the common helpers read[l,x]_poll_timeout provided by Linux core
> instead of an open-coded handling. The name of the local variable
> sram_pdn_ack in scpsys_power_on is renamed to pdn_ack in order to be
> consistent with the one used in scpsys_power_off.
>
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Weiyi Lu <weiyi.lu@...iatek.com>
> ---
pushed to v4.17-next/soc
Thanks!
> drivers/soc/mediatek/mtk-scpsys.c | 91 ++++++++++-----------------------------
> 1 file changed, 23 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index d762a46..f9b7248 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -13,6 +13,7 @@
> #include <linux/clk.h>
> #include <linux/init.h>
> #include <linux/io.h>
> +#include <linux/iopoll.h>
> #include <linux/mfd/syscon.h>
> #include <linux/of_device.h>
> #include <linux/platform_device.h>
> @@ -27,6 +28,9 @@
> #include <dt-bindings/power/mt7623a-power.h>
> #include <dt-bindings/power/mt8173-power.h>
>
> +#define MTK_POLL_DELAY_US 10
> +#define MTK_POLL_TIMEOUT (jiffies_to_usecs(HZ))
> +
> #define SPM_VDE_PWR_CON 0x0210
> #define SPM_MFG_PWR_CON 0x0214
> #define SPM_VEN_PWR_CON 0x0230
> @@ -184,12 +188,10 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> {
> struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
> struct scp *scp = scpd->scp;
> - unsigned long timeout;
> - bool expired;
> void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
> - u32 sram_pdn_ack = scpd->data->sram_pdn_ack_bits;
> + u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
> u32 val;
> - int ret;
> + int ret, tmp;
> int i;
>
> if (scpd->supply) {
> @@ -215,23 +217,10 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> writel(val, ctl_addr);
>
> /* wait until PWR_ACK = 1 */
> - timeout = jiffies + HZ;
> - expired = false;
> - while (1) {
> - ret = scpsys_domain_is_on(scpd);
> - if (ret > 0)
> - break;
> -
> - if (expired) {
> - ret = -ETIMEDOUT;
> - goto err_pwr_ack;
> - }
> -
> - cpu_relax();
> -
> - if (time_after(jiffies, timeout))
> - expired = true;
> - }
> + ret = readx_poll_timeout(scpsys_domain_is_on, scpd, tmp, tmp > 0,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto err_pwr_ack;
>
> val &= ~PWR_CLK_DIS_BIT;
> writel(val, ctl_addr);
> @@ -246,20 +235,10 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
> writel(val, ctl_addr);
>
> /* wait until SRAM_PDN_ACK all 0 */
> - timeout = jiffies + HZ;
> - expired = false;
> - while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) {
> -
> - if (expired) {
> - ret = -ETIMEDOUT;
> - goto err_pwr_ack;
> - }
> -
> - cpu_relax();
> -
> - if (time_after(jiffies, timeout))
> - expired = true;
> - }
> + ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto err_pwr_ack;
>
> if (scpd->data->bus_prot_mask) {
> ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
> @@ -289,12 +268,10 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> {
> struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
> struct scp *scp = scpd->scp;
> - unsigned long timeout;
> - bool expired;
> void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
> u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
> u32 val;
> - int ret;
> + int ret, tmp;
> int i;
>
> if (scpd->data->bus_prot_mask) {
> @@ -310,19 +287,10 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> writel(val, ctl_addr);
>
> /* wait until SRAM_PDN_ACK all 1 */
> - timeout = jiffies + HZ;
> - expired = false;
> - while (pdn_ack && (readl(ctl_addr) & pdn_ack) != pdn_ack) {
> - if (expired) {
> - ret = -ETIMEDOUT;
> - goto out;
> - }
> -
> - cpu_relax();
> -
> - if (time_after(jiffies, timeout))
> - expired = true;
> - }
> + ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto out;
>
> val |= PWR_ISO_BIT;
> writel(val, ctl_addr);
> @@ -340,23 +308,10 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> writel(val, ctl_addr);
>
> /* wait until PWR_ACK = 0 */
> - timeout = jiffies + HZ;
> - expired = false;
> - while (1) {
> - ret = scpsys_domain_is_on(scpd);
> - if (ret == 0)
> - break;
> -
> - if (expired) {
> - ret = -ETIMEDOUT;
> - goto out;
> - }
> -
> - cpu_relax();
> -
> - if (time_after(jiffies, timeout))
> - expired = true;
> - }
> + ret = readx_poll_timeout(scpsys_domain_is_on, scpd, tmp, tmp == 0,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto out;
>
> for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
> clk_disable_unprepare(scpd->clk[i]);
>
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