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drm/stm: ltdc: add pinctrl for DPI encoder mode

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The implementation of functions encoder_enable and encoder_disable
make possible to control the pinctrl according to the encoder type.
The pinctrl must be activated only if the encoder type is DPI.
This helps to move the DPI-related pinctrl configuration from
all the panel or bridge to the LTDC dt node.

Reviewed-by: Philippe Cornu <philippe.cornu@st.com>

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1567761708-31777-1-git-send-email-yannick.fertre@st.com
This commit is contained in:
Yannick Fertré 2019-09-06 11:21:48 +02:00 committed by Benjamin Gaignard
parent a793f0eeb7
commit 92a57b3fb5
1 changed files with 35 additions and 0 deletions
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35
drivers/gpu/drm/stm/ltdc.c
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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_graph.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
@ -1040,6 +1041,36 @@ static const struct drm_encoder_funcs ltdc_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static void ltdc_encoder_disable(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
DRM_DEBUG_DRIVER("\n");
/* Set to sleep state the pinctrl whatever type of encoder */
pinctrl_pm_select_sleep_state(ddev->dev);
}
static void ltdc_encoder_enable(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
DRM_DEBUG_DRIVER("\n");
/*
* Set to default state the pinctrl only with DPI type.
* Others types like DSI, don't need pinctrl due to
* internal bridge (the signals do not come out of the chipset).
*/
if (encoder->encoder_type == DRM_MODE_ENCODER_DPI)
pinctrl_pm_select_default_state(ddev->dev);
}
static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = {
.disable = ltdc_encoder_disable,
.enable = ltdc_encoder_enable,
};
static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
{
struct drm_encoder *encoder;
@ -1055,6 +1086,8 @@ static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
drm_encoder_init(ddev, encoder, &ltdc_encoder_funcs,
DRM_MODE_ENCODER_DPI, NULL);
drm_encoder_helper_add(encoder, &ltdc_encoder_helper_funcs);
ret = drm_bridge_attach(encoder, bridge, NULL);
if (ret) {
drm_encoder_cleanup(encoder);
@ -1280,6 +1313,8 @@ int ltdc_load(struct drm_device *ddev)
clk_disable_unprepare(ldev->pixel_clk);
pinctrl_pm_select_sleep_state(ddev->dev);
pm_runtime_enable(ddev->dev);
return 0;