[Intel-gfx] [PATCH v6 4/4] drm/i915/intel_dsi_vbt: Add support for PMIC MIPI sequences

[Ville Syrjälä]

On Mon, Jan 07, 2019 at 12:15:56PM +0100, Hans de Goede wrote:
> Add support for PMIC MIPI sequences using the new
> intel_soc_pmic_exec_mipi_pmic_seq_element function.
> 
> This fixes the DSI LCD panel not lighting up when not initialized by the
> GOP (because an external monitor was connected) on GPD win and GPD pocket
> devices.
> 
> Specifically the LCD panel seems to need GPIO pin 9 on the PMIC to be
> driven high, which is done through a PMIC MIPI sequence. Before this commit
> if the sequence was not executed by the GOP the pin would stay low causing
> the LCD panel to not work. Having the MIPI sequences properly control this
> GPIO should also help save some power when the panel is off.
> 
> Changes in v2, v3:
> -Only changes to other patches in this patch-set
> 
> Changes in v4:
> -Move decoding of the raw 15 bytes PMIC MIPI sequence element into
>  i2c-address, register-address, value and mask into the mipi_exec_pmic()
>  function instead of passing the raw data to
>  intel_soc_pmic_exec_mipi_pmic_seq_element()
> 
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dsi_vbt.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
> index 3d1fa1a03a66..240664ef294c 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
> @@ -29,9 +29,11 @@
>  #include <drm/drm_edid.h>
>  #include <drm/i915_drm.h>
>  #include <linux/gpio/consumer.h>
> +#include <linux/mfd/intel_soc_pmic.h>
>  #include <linux/slab.h>
>  #include <video/mipi_display.h>
>  #include <asm/intel-mid.h>
> +#include <asm/unaligned.h>
>  #include "i915_drv.h"
>  #include "intel_drv.h"
>  #include "intel_dsi.h"
> @@ -392,7 +394,25 @@ static const u8 *mipi_exec_spi(struct intel_dsi *intel_dsi, const u8 *data)
>  
>  static const u8 *mipi_exec_pmic(struct intel_dsi *intel_dsi, const u8 *data)
>  {
> -	DRM_DEBUG_KMS("Skipping PMIC element execution\n");
> +#ifdef CONFIG_PMIC_OPREGION
> +	u32 value, mask, reg_address;
> +	u16 i2c_address;
> +	int ret;
> +
> +	/* byte 0 aka PMIC Flag is reserved */
> +	i2c_address	= get_unaligned_le16(data + 1);
> +	reg_address	= get_unaligned_le32(data + 3);
> +	value		= get_unaligned_le32(data + 7);
> +	mask		= get_unaligned_le32(data + 11);
> +
> +	ret = intel_soc_pmic_exec_mipi_pmic_seq_element(i2c_address,
> +							reg_address,
> +							value, mask);
> +	if (ret)
> +		DRM_ERROR("%s failed, error: %d\n", __func__, ret);
> +#else
> +	DRM_ERROR("Your hardware requires CONFIG_PMIC_OPREGION and it is not set\n");
> +#endif
>  
>  	return data + 15;
>  }
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel