[PATCH v4 08/15] soc: bcm: bcm2835-power: Add support for BCM2711's RPiVid ASB
Peter Robinson
pbrobinson at gmail.com
Sun Feb 20 11:27:48 PST 2022
Hi Stefan,
On Sat, Feb 19, 2022 at 3:39 PM Stefan Wahren <stefan.wahren at i2se.com> wrote:
>
> Hi Peter,
>
> Am 13.02.22 um 23:56 schrieb Peter Robinson:
> > From: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
> >
> > In BCM2711 the new RPiVid ASB took over V3D. The old ASB is still present
> > with the ISP and H264 bits, and V3D is in the same place in the new ASB
> > as the old one.
> >
> > Use the fact that 'pm->rpivid_asb' is populated as a hint that we're on
> > BCM2711. On top of that introduce the macro ASB_BASE() which will select
> > the correct ASB register base, based on whether we're trying to access
> > V3D and which platform we're on.
> >
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
> > Signed-off-by: Peter Robinson <pbrobinson at gmail.com>
> > ---
> > Changes since v2:
> > - Correct names again
> >
> > Changes since v1:
> > - Correct names
> >
> > drivers/soc/bcm/bcm2835-power.c | 66 ++++++++++++++++++++-------------
> > 1 file changed, 41 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/soc/bcm/bcm2835-power.c b/drivers/soc/bcm/bcm2835-power.c
> > index 1e0041ec8132..eea31f75dc64 100644
> > --- a/drivers/soc/bcm/bcm2835-power.c
> > +++ b/drivers/soc/bcm/bcm2835-power.c
> > @@ -126,8 +126,9 @@
> >
> > #define ASB_AXI_BRDG_ID 0x20
> >
> > -#define ASB_READ(reg) readl(power->asb + (reg))
> > -#define ASB_WRITE(reg, val) writel(PM_PASSWORD | (val), power->asb + (reg))
> > +#define ASB_BASE(is_v3d) (is_v3d && power->rpivid_asb ? power->rpivid_asb : power->asb)
> > +#define ASB_READ(reg, is_v3d) readl(ASB_BASE(is_v3d) + (reg))
> > +#define ASB_WRITE(reg, val, is_v3d) writel(PM_PASSWORD | (val), ASB_BASE(is_v3d) + (reg))
> just a general note: passing parameter to decide which register should
> be used is not the preferred way. It's harder to maintain. A more data
> driven approach is better in the long run.
> >
> > struct bcm2835_power_domain {
> > struct generic_pm_domain base;
> > @@ -142,13 +143,16 @@ struct bcm2835_power {
> > void __iomem *base;
> > /* AXI Async bridge registers. */
> > void __iomem *asb;
> > + /* RPiVid bridge registers. */
> > + void __iomem *rpivid_asb;
> >
> > struct genpd_onecell_data pd_xlate;
> > struct bcm2835_power_domain domains[BCM2835_POWER_DOMAIN_COUNT];
> > struct reset_controller_dev reset;
> > };
> >
> > -static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg)
> > +static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg,
> > + bool is_v3d)
> > {
> > u64 start;
> >
> > @@ -158,8 +162,8 @@ static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg)
> > start = ktime_get_ns();
> >
> > /* Enable the module's async AXI bridges. */
> > - ASB_WRITE(reg, ASB_READ(reg) & ~ASB_REQ_STOP);
> > - while (ASB_READ(reg) & ASB_ACK) {
> > + ASB_WRITE(reg, ASB_READ(reg, is_v3d) & ~ASB_REQ_STOP, is_v3d);
> > + while (ASB_READ(reg, is_v3d) & ASB_ACK) {
> > cpu_relax();
> > if (ktime_get_ns() - start >= 1000)
> > return -ETIMEDOUT;
> > @@ -168,7 +172,8 @@ static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg)
> > return 0;
> > }
> >
> > -static int bcm2835_asb_disable(struct bcm2835_power *power, u32 reg)
> > +static int bcm2835_asb_disable(struct bcm2835_power *power, u32 reg,
> > + bool is_v3d)
> > {
> > u64 start;
> >
> > @@ -178,8 +183,8 @@ static int bcm2835_asb_disable(struct bcm2835_power *power, u32 reg)
> > start = ktime_get_ns();
> >
> > /* Enable the module's async AXI bridges. */
> > - ASB_WRITE(reg, ASB_READ(reg) | ASB_REQ_STOP);
> > - while (!(ASB_READ(reg) & ASB_ACK)) {
> > + ASB_WRITE(reg, ASB_READ(reg, is_v3d) | ASB_REQ_STOP, is_v3d);
> > + while (!(ASB_READ(reg, is_v3d) & ASB_ACK)) {
> > cpu_relax();
> > if (ktime_get_ns() - start >= 1000)
> > return -ETIMEDOUT;
> > @@ -274,7 +279,8 @@ static int bcm2835_asb_power_on(struct bcm2835_power_domain *pd,
> > u32 pm_reg,
> > u32 asb_m_reg,
> > u32 asb_s_reg,
> > - u32 reset_flags)
> > + u32 reset_flags,
> > + bool is_v3d)
> > {
> > struct bcm2835_power *power = pd->power;
> > int ret;
> > @@ -301,13 +307,13 @@ static int bcm2835_asb_power_on(struct bcm2835_power_domain *pd,
> > goto err_enable_resets;
> > }
> >
> > - ret = bcm2835_asb_enable(power, asb_m_reg);
> > + ret = bcm2835_asb_enable(power, asb_m_reg, is_v3d);
> > if (ret) {
> > dev_err(power->dev, "Failed to enable ASB master for %s\n",
> > pd->base.name);
> > goto err_disable_clk;
> > }
> > - ret = bcm2835_asb_enable(power, asb_s_reg);
> > + ret = bcm2835_asb_enable(power, asb_s_reg, is_v3d);
> > if (ret) {
> > dev_err(power->dev, "Failed to enable ASB slave for %s\n",
> > pd->base.name);
> > @@ -317,7 +323,7 @@ static int bcm2835_asb_power_on(struct bcm2835_power_domain *pd,
> > return 0;
> >
> > err_disable_asb_master:
> > - bcm2835_asb_disable(power, asb_m_reg);
> > + bcm2835_asb_disable(power, asb_m_reg, is_v3d);
> > err_disable_clk:
> > clk_disable_unprepare(pd->clk);
> > err_enable_resets:
> > @@ -329,22 +335,23 @@ static int bcm2835_asb_power_off(struct bcm2835_power_domain *pd,
> > u32 pm_reg,
> > u32 asb_m_reg,
> > u32 asb_s_reg,
> > - u32 reset_flags)
> > + u32 reset_flags,
> > + bool is_v3d)
> > {
> > struct bcm2835_power *power = pd->power;
> > int ret;
> >
> > - ret = bcm2835_asb_disable(power, asb_s_reg);
> > + ret = bcm2835_asb_disable(power, asb_s_reg, is_v3d);
> > if (ret) {
> > dev_warn(power->dev, "Failed to disable ASB slave for %s\n",
> > pd->base.name);
> > return ret;
> > }
> > - ret = bcm2835_asb_disable(power, asb_m_reg);
> > + ret = bcm2835_asb_disable(power, asb_m_reg, is_v3d);
> > if (ret) {
> > dev_warn(power->dev, "Failed to disable ASB master for %s\n",
> > pd->base.name);
> > - bcm2835_asb_enable(power, asb_s_reg);
> > + bcm2835_asb_enable(power, asb_s_reg, is_v3d);
> > return ret;
> > }
> >
> > @@ -369,7 +376,7 @@ static int bcm2835_power_pd_power_on(struct generic_pm_domain *domain)
> > case BCM2835_POWER_DOMAIN_GRAFX_V3D:
> > return bcm2835_asb_power_on(pd, PM_GRAFX,
> > ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
> > - PM_V3DRSTN);
> > + PM_V3DRSTN, true);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE:
> > return bcm2835_power_power_on(pd, PM_IMAGE);
> > @@ -377,17 +384,17 @@ static int bcm2835_power_pd_power_on(struct generic_pm_domain *domain)
> > case BCM2835_POWER_DOMAIN_IMAGE_PERI:
> > return bcm2835_asb_power_on(pd, PM_IMAGE,
> > 0, 0,
> > - PM_PERIRSTN);
> > + PM_PERIRSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE_ISP:
> > return bcm2835_asb_power_on(pd, PM_IMAGE,
> > ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
> > - PM_ISPRSTN);
> > + PM_ISPRSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE_H264:
> > return bcm2835_asb_power_on(pd, PM_IMAGE,
> > ASB_H264_M_CTRL, ASB_H264_S_CTRL,
> > - PM_H264RSTN);
> > + PM_H264RSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_USB:
> > PM_WRITE(PM_USB, PM_USB_CTRLEN);
> > @@ -435,7 +442,7 @@ static int bcm2835_power_pd_power_off(struct generic_pm_domain *domain)
> > case BCM2835_POWER_DOMAIN_GRAFX_V3D:
> > return bcm2835_asb_power_off(pd, PM_GRAFX,
> > ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
> > - PM_V3DRSTN);
> > + PM_V3DRSTN, true);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE:
> > return bcm2835_power_power_off(pd, PM_IMAGE);
> > @@ -443,17 +450,17 @@ static int bcm2835_power_pd_power_off(struct generic_pm_domain *domain)
> > case BCM2835_POWER_DOMAIN_IMAGE_PERI:
> > return bcm2835_asb_power_off(pd, PM_IMAGE,
> > 0, 0,
> > - PM_PERIRSTN);
> > + PM_PERIRSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE_ISP:
> > return bcm2835_asb_power_off(pd, PM_IMAGE,
> > ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
> > - PM_ISPRSTN);
> > + PM_ISPRSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_IMAGE_H264:
> > return bcm2835_asb_power_off(pd, PM_IMAGE,
> > ASB_H264_M_CTRL, ASB_H264_S_CTRL,
> > - PM_H264RSTN);
> > + PM_H264RSTN, false);
> >
> > case BCM2835_POWER_DOMAIN_USB:
> > PM_WRITE(PM_USB, 0);
> > @@ -626,13 +633,22 @@ static int bcm2835_power_probe(struct platform_device *pdev)
> > power->dev = dev;
> > power->base = pm->base;
> > power->asb = pm->asb;
> > + power->rpivid_asb = pm->rpivid_asb;
> >
> > - id = ASB_READ(ASB_AXI_BRDG_ID);
> > + id = ASB_READ(ASB_AXI_BRDG_ID, false);
> > if (id != 0x62726467 /* "BRDG" */) {
> > dev_err(dev, "ASB register ID returned 0x%08x\n", id);
> > return -ENODEV;
> > }
> >
> > + if (pm->rpivid_asb) {
> > + id = ASB_READ(ASB_AXI_BRDG_ID, true);
> > + if (id != 0x62726467 /* "BRDG" */) {
>
> It would be nice to use a define for this id, since we use it twice.
Any preferences or suggestion as to what it should be called?
Also are you prepared to add/ok if I add your reviewed-by to the
patches you've reviewed?
Peter
> Best regards
>
> > + dev_err(dev, "RPiVid ASB register ID returned 0x%08x\n", id);
> > + return -ENODEV;
> > + }
> > + }
> > +
> > power->pd_xlate.domains = devm_kcalloc(dev,
> > ARRAY_SIZE(power_domain_names),
> > sizeof(*power->pd_xlate.domains),
>
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