[PATCH v3 14/15] drm/i915/dsi: Replace poking of CHV GPIOs behind the driver's back

Andy Shevchenko
2023-11-02T15:13:12Z

It's a dirty hack in the driver that pokes GPIO registers behind
the driver's back. Moreoever it might be problematic as simultaneous
I/O may hang the system, see the commit 0bd50d719b00 ("pinctrl:
cherryview: prevent concurrent access to GPIO controllers") for
the details. Taking all this into consideration replace the hack
with proper GPIO APIs being used.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 47 +++++---------------
1 file changed, 10 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
index b1736c1301ea..ffc65c943b11 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
@@ -66,19 +66,6 @@ struct i2c_adapter_lookup {
#define CHV_GPIO_IDX_START_SW 100
#define CHV_GPIO_IDX_START_SE 198

-#define CHV_VBT_MAX_PINS_PER_FMLY 15
-
-#define CHV_GPIO_PAD_CFG0(f, i) (0x4400 + (f) * 0x400 + (i) * 8)
-#define CHV_GPIO_GPIOEN (1 << 15)
-#define CHV_GPIO_GPIOCFG_GPIO (0 << 8)
-#define CHV_GPIO_GPIOCFG_GPO (1 << 8)
-#define CHV_GPIO_GPIOCFG_GPI (2 << 8)
-#define CHV_GPIO_GPIOCFG_HIZ (3 << 8)
-#define CHV_GPIO_GPIOTXSTATE(state) ((!!(state)) << 1)
-
-#define CHV_GPIO_PAD_CFG1(f, i) (0x4400 + (f) * 0x400 + (i) * 8 + 4)
-#define CHV_GPIO_CFGLOCK (1 << 31)
-
/* ICL DSI Display GPIO Pins */
#define ICL_GPIO_DDSP_HPD_A 0
#define ICL_GPIO_L_VDDEN_1 1
@@ -278,23 +265,21 @@ static void chv_gpio_set_value(struct intel_connector *connector,
u8 gpio_source, u8 gpio_index, bool value)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- u16 cfg0, cfg1;
- u16 family_num;
- u8 port;

if (connector->panel.vbt.dsi.seq_version >= 3) {
if (gpio_index >= CHV_GPIO_IDX_START_SE) {
/* XXX: it's unclear whether 255->57 is part of SE. */
- gpio_index -= CHV_GPIO_IDX_START_SE;
- port = CHV_IOSF_PORT_GPIO_SE;
+ soc_exec_opaque_gpio(connector, gpio_index, "INT33FF:03", "Panel SE",
+ gpio_index - CHV_GPIO_IDX_START_SW, value);
} else if (gpio_index >= CHV_GPIO_IDX_START_SW) {
- gpio_index -= CHV_GPIO_IDX_START_SW;
- port = CHV_IOSF_PORT_GPIO_SW;
+ soc_exec_opaque_gpio(connector, gpio_index, "INT33FF:00", "Panel SW",
+ gpio_index - CHV_GPIO_IDX_START_SW, value);
} else if (gpio_index >= CHV_GPIO_IDX_START_E) {
- gpio_index -= CHV_GPIO_IDX_START_E;
- port = CHV_IOSF_PORT_GPIO_E;
+ soc_exec_opaque_gpio(connector, gpio_index, "INT33FF:02", "Panel E",
+ gpio_index - CHV_GPIO_IDX_START_E, value);
} else {
- port = CHV_IOSF_PORT_GPIO_N;
+ soc_exec_opaque_gpio(connector, gpio_index, "INT33FF:01", "Panel N",
+ gpio_index - CHV_GPIO_IDX_START_N, value);
}
} else {
/* XXX: The spec is unclear about CHV GPIO on seq v2 */
@@ -311,21 +296,9 @@ static void chv_gpio_set_value(struct intel_connector *connector,
return;
}

- port = CHV_IOSF_PORT_GPIO_N;
+ soc_exec_opaque_gpio(connector, gpio_index, "INT33FF:01", "Panel N",
+ gpio_index - CHV_GPIO_IDX_START_N, value);
}
-
- family_num = gpio_index / CHV_VBT_MAX_PINS_PER_FMLY;
- gpio_index = gpio_index % CHV_VBT_MAX_PINS_PER_FMLY;
-
- cfg0 = CHV_GPIO_PAD_CFG0(family_num, gpio_index);
- cfg1 = CHV_GPIO_PAD_CFG1(family_num, gpio_index);
-
- vlv_iosf_sb_get(dev_priv, BIT(VLV_IOSF_SB_GPIO));
- vlv_iosf_sb_write(dev_priv, port, cfg1, 0);
- vlv_iosf_sb_write(dev_priv, port, cfg0,
- CHV_GPIO_GPIOEN | CHV_GPIO_GPIOCFG_GPO |
- CHV_GPIO_GPIOTXSTATE(value));
- vlv_iosf_sb_put(dev_priv, BIT(VLV_IOSF_SB_GPIO));
}

static void bxt_gpio_set_value(struct intel_connector *connector,
--
2.40.0.1.gaa8946217a0b