[PATCH 3/3] bus: ti-sysc: Implement display subsystem reset quirk
From: Tony Lindgren
Date: Mon Feb 24 2020 - 14:12:52 EST
The display subsystem (DSS) needs the child outputs disabled for reset.
In order to prepare to probe DSS without legacy platform data, let's
implement sysc_pre_reset_quirk_dss() similar to what we have for the
platform data with omap_dss_reset().
Note that we cannot directly use the old omap_dss_reset() without
platform data callbacks and updating omap_dss_reset() to understand
struct device. And we will be dropping omap_dss_reset() anyways when
all the SoCs are probing with device tree, so let's not mess with the
legacy code at all.
Cc: Jyri Sarha <jsarha@xxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
drivers/bus/ti-sysc.c | 131 +++++++++++++++++++++++++-
include/linux/platform_data/ti-sysc.h | 1 +
2 files changed, 129 insertions(+), 3 deletions(-)
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1303,11 +1303,11 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
SYSC_QUIRK("dcan", 0x48480000, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff,
SYSC_QUIRK_CLKDM_NOAUTO),
SYSC_QUIRK("dss", 0x4832a000, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
- SYSC_QUIRK_OPT_CLKS_IN_RESET),
+ SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000040, 0xffffffff,
- SYSC_QUIRK_OPT_CLKS_IN_RESET),
+ SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000061, 0xffffffff,
- SYSC_QUIRK_OPT_CLKS_IN_RESET),
+ SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
SYSC_QUIRK("dwc3", 0x48880000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff,
SYSC_QUIRK_CLKDM_NOAUTO),
SYSC_QUIRK("dwc3", 0x488c0000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff,
@@ -1468,6 +1468,128 @@ static void sysc_init_revision_quirks(struct sysc *ddata)
}
}
+/*
+ * DSS needs dispc outputs disabled to reset modules. Returns mask of
+ * enabled DSS interrupts. Eventually we may be able to do this on
+ * dispc init rather than top-level DSS init.
+ */
+static u32 sysc_quirk_dispc(struct sysc *ddata, int dispc_offset,
+ bool disable)
+{
+ bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false;
+ const int lcd_en_mask = BIT(0), digit_en_mask = BIT(1);
+ int manager_count;
+ bool framedonetv_irq;
+ u32 val, irq_mask = 0;
+
+ switch (sysc_soc->soc) {
+ case SOC_2420 ... SOC_3630:
+ manager_count = 2;
+ framedonetv_irq = false;
+ break;
+ case SOC_4430 ... SOC_4470:
+ manager_count = 3;
+ break;
+ case SOC_5430:
+ case SOC_DRA7:
+ manager_count = 4;
+ break;
+ case SOC_AM4:
+ manager_count = 1;
+ break;
+ case SOC_UNKNOWN:
+ default:
+ return 0;
+ };
+
+ /* Remap the whole module range to be able to reset dispc outputs */
+ devm_iounmap(ddata->dev, ddata->module_va);
+ ddata->module_va = devm_ioremap(ddata->dev,
+ ddata->module_pa,
+ ddata->module_size);
+ if (!ddata->module_va)
+ return -EIO;
+
+ /* DISP_CONTROL */
+ val = sysc_read(ddata, dispc_offset + 0x40);
+ lcd_en = val & lcd_en_mask;
+ digit_en = val & digit_en_mask;
+ if (lcd_en)
+ irq_mask |= BIT(0); /* FRAMEDONE */
+ if (digit_en) {
+ if (framedonetv_irq)
+ irq_mask |= BIT(24); /* FRAMEDONETV */
+ else
+ irq_mask |= BIT(2) | BIT(3); /* EVSYNC bits */
+ }
+ if (disable & (lcd_en | digit_en))
+ sysc_write(ddata, dispc_offset + 0x40,
+ val & ~(lcd_en_mask | digit_en_mask));
+
+ if (manager_count <= 2)
+ return irq_mask;
+
+ /* DISPC_CONTROL2 */
+ val = sysc_read(ddata, dispc_offset + 0x238);
+ lcd2_en = val & lcd_en_mask;
+ if (lcd2_en)
+ irq_mask |= BIT(22); /* FRAMEDONE2 */
+ if (disable && lcd2_en)
+ sysc_write(ddata, dispc_offset + 0x238,
+ val & ~lcd_en_mask);
+
+ if (manager_count <= 3)
+ return irq_mask;
+
+ /* DISPC_CONTROL3 */
+ val = sysc_read(ddata, dispc_offset + 0x848);
+ lcd3_en = val & lcd_en_mask;
+ if (lcd3_en)
+ irq_mask |= BIT(30); /* FRAMEDONE3 */
+ if (disable && lcd3_en)
+ sysc_write(ddata, dispc_offset + 0x848,
+ val & ~lcd_en_mask);
+
+ return irq_mask;
+}
+
+/* DSS needs child outputs disabled and SDI registers cleared for reset */
+static void sysc_pre_reset_quirk_dss(struct sysc *ddata)
+{
+ const int dispc_offset = 0x1000;
+ int error;
+ u32 irq_mask, val;
+
+ /* Get enabled outputs */
+ irq_mask = sysc_quirk_dispc(ddata, dispc_offset, false);
+ if (!irq_mask)
+ return;
+
+ /* Clear IRQSTATUS */
+ sysc_write(ddata, 0x1000 + 0x18, irq_mask);
+
+ /* Disable outputs */
+ val = sysc_quirk_dispc(ddata, dispc_offset, true);
+
+ /* Poll IRQSTATUS */
+ error = readl_poll_timeout(ddata->module_va + dispc_offset + 0x18,
+ val, val != irq_mask, 100, 50);
+ if (error)
+ dev_warn(ddata->dev, "%s: timed out %08x !+ %08x\n",
+ __func__, val, irq_mask);
+
+ if (sysc_soc->soc == SOC_3430) {
+ /* Clear DSS_SDI_CONTROL */
+ sysc_write(ddata, dispc_offset + 0x44, 0);
+
+ /* Clear DSS_PLL_CONTROL */
+ sysc_write(ddata, dispc_offset + 0x48, 0);
+ }
+
+ /* Clear DSS_CONTROL to switch DSS clock sources to PRCM if not */
+ sysc_write(ddata, dispc_offset + 0x40, 0);
+}
+
/* 1-wire needs module's internal clocks enabled for reset */
static void sysc_pre_reset_quirk_hdq1w(struct sysc *ddata)
{
@@ -1606,6 +1728,9 @@ static void sysc_init_module_quirks(struct sysc *ddata)
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_AESS)
ddata->module_enable_quirk = sysc_module_enable_quirk_aess;
+ if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_DSS_RESET)
+ ddata->pre_reset_quirk = sysc_pre_reset_quirk_dss;
+
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_RTC_UNLOCK) {
ddata->module_unlock_quirk = sysc_module_unlock_quirk_rtc;
ddata->module_lock_quirk = sysc_module_lock_quirk_rtc;
diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -49,6 +49,7 @@ struct sysc_regbits {
s8 emufree_shift;
};
+#define SYSC_MODULE_QUIRK_DSS_RESET BIT(23)
#define SYSC_MODULE_QUIRK_RTC_UNLOCK BIT(22)
#define SYSC_QUIRK_CLKDM_NOAUTO BIT(21)
#define SYSC_QUIRK_FORCE_MSTANDBY BIT(20)
--
2.25.1