On Mon, 05 Dec 2016, Mika Kahola <mika.kahola@xxxxxxxxx> wrote:
> From: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> Request the GPIO by index through the consumer API. For now, use a quick
> hack to store the already requested ones, simply because I have no idea
> whether this actually works or not, and I have no way to test it.
>
> v2: switch *NULL* to *"panel"* when requesting gpio for MIPI/DSI panel. (Mika)
>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
Pushed to dinq.
BR,
Jani.
> ---
> drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 38 +++++++++++++++++++++++++-----
> 1 file changed, 32 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> index 0d8ff00..dda678b 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> @@ -29,6 +29,7 @@
> #include <drm/drm_edid.h>
> #include <drm/i915_drm.h>
> #include <drm/drm_panel.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/slab.h>
> #include <video/mipi_display.h>
> #include <asm/intel-mid.h>
> @@ -304,19 +305,44 @@ static void chv_exec_gpio(struct drm_i915_private *dev_priv,
> mutex_unlock(&dev_priv->sb_lock);
> }
>
> +static void bxt_exec_gpio(struct drm_i915_private *dev_priv,
> + u8 gpio_source, u8 gpio_index, bool value)
> +{
> + /* XXX: this table is a quick ugly hack. */
> + static struct gpio_desc *bxt_gpio_table[U8_MAX + 1];
> + struct gpio_desc *gpio_desc = bxt_gpio_table[gpio_index];
> +
> + if (!gpio_desc) {
> + gpio_desc = devm_gpiod_get_index(dev_priv->drm.dev,
> + "panel", gpio_index,
> + value ? GPIOD_OUT_LOW :
> + GPIOD_OUT_HIGH);
> +
> + if (IS_ERR_OR_NULL(gpio_desc)) {
> + DRM_ERROR("GPIO index %u request failed (%ld)\n",
> + gpio_index, PTR_ERR(gpio_desc));
> + return;
> + }
> +
> + bxt_gpio_table[gpio_index] = gpio_desc;
> + }
> +
> + gpiod_set_value(gpio_desc, value);
> +}
> +
> static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
> {
> struct drm_device *dev = intel_dsi->base.base.dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> - u8 gpio_source, gpio_index;
> + u8 gpio_source, gpio_index = 0, gpio_number;
> bool value;
>
> DRM_DEBUG_KMS("\n");
>
> if (dev_priv->vbt.dsi.seq_version >= 3)
> - data++;
> + gpio_index = *data++;
>
> - gpio_index = *data++;
> + gpio_number = *data++;
>
> /* gpio source in sequence v2 only */
> if (dev_priv->vbt.dsi.seq_version == 2)
> @@ -328,11 +354,11 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
> value = *data++ & 1;
>
> if (IS_VALLEYVIEW(dev_priv))
> - vlv_exec_gpio(dev_priv, gpio_source, gpio_index, value);
> + vlv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
> else if (IS_CHERRYVIEW(dev_priv))
> - chv_exec_gpio(dev_priv, gpio_source, gpio_index, value);
> + chv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
> else
> - DRM_DEBUG_KMS("GPIO element not supported on this platform\n");
> + bxt_exec_gpio(dev_priv, gpio_source, gpio_index, value);
>
> return data;
> }
--
Jani Nikula, Intel Open Source Technology Center
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