Some MIPI DSI panel drivers like 'raydium,rm68200' send
MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
requires the MIPI DSI controller and PHY to be ready beforehand.
Without this patch, the nwl-dsi driver gets the MIPI DSI controller
and PHY ready in bridge_funcs->pre_enable(), which happens after
the panel_funcs->prepare(). So, this patch shifts the bridge operation
ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
are called in pairs, which includes removing a check on unchanged HS
clock rate and forcing a full modeset when only connector's DPMS is
brought out of "Off" status.
Cc: Andrzej Hajda <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Guido Günther <[email protected]>
Cc: Robert Chiras <[email protected]>
Cc: NXP Linux Team <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
---
v1->v2:
* Fix commit message typo - s/unchange/unchanged/
drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
1 file changed, 46 insertions(+), 40 deletions(-)
diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index be6bfc5..229f0b1 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -21,6 +21,7 @@
#include <linux/sys_soc.h>
#include <linux/time64.h>
+#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
@@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
-static int nwl_dsi_enable(struct nwl_dsi *dsi)
+static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
{
struct device *dev = dsi->dev;
union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
@@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
return 0;
}
-static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct nwl_dsi *dsi = bridge_to_dsi(bridge);
int ret;
@@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
return 0;
}
-static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
- const struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
-{
- /* At least LCDIF + NWL needs active high sync */
- adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
- adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
-
- return true;
-}
-
static enum drm_mode_status
nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
@@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
return MODE_OK;
}
+static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+
+ /* At least LCDIF + NWL needs active high sync */
+ adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+ adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+
+ /*
+ * Do a full modeset if crtc_state->active is changed to be true.
+ * This ensures our ->mode_set() is called to get the DSI controller
+ * and the PHY ready to send DCS commands, when only the connector's
+ * DPMS is brought out of "Off" status.
+ */
+ if (crtc_state->active_changed && crtc_state->active)
+ crtc_state->mode_changed = true;
+
+ return 0;
+}
+
static void
nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
@@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
if (ret < 0)
return;
- /*
- * If hs clock is unchanged, we're all good - all parameters are
- * derived from it atm.
- */
- if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
- return;
-
phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
/* Save the new desired phy config */
@@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
drm_mode_debug_printmodeline(adjusted_mode);
-}
-static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
-{
- struct nwl_dsi *dsi = bridge_to_dsi(bridge);
- int ret;
-
- pm_runtime_get_sync(dsi->dev);
+ pm_runtime_get_sync(dev);
if (clk_prepare_enable(dsi->lcdif_clk) < 0)
return;
@@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
/* Step 1 from DSI reset-out instructions */
ret = reset_control_deassert(dsi->rst_pclk);
if (ret < 0) {
- DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
+ DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
return;
}
/* Step 2 from DSI reset-out instructions */
- nwl_dsi_enable(dsi);
+ nwl_dsi_mode_set(dsi);
/* Step 3 from DSI reset-out instructions */
ret = reset_control_deassert(dsi->rst_esc);
if (ret < 0) {
- DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
+ DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
return;
}
ret = reset_control_deassert(dsi->rst_byte);
if (ret < 0) {
- DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
+ DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
return;
}
}
-static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct nwl_dsi *dsi = bridge_to_dsi(bridge);
int ret;
@@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
}
static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
- .pre_enable = nwl_dsi_bridge_pre_enable,
- .enable = nwl_dsi_bridge_enable,
- .disable = nwl_dsi_bridge_disable,
- .mode_fixup = nwl_dsi_bridge_mode_fixup,
- .mode_set = nwl_dsi_bridge_mode_set,
- .mode_valid = nwl_dsi_bridge_mode_valid,
- .attach = nwl_dsi_bridge_attach,
- .detach = nwl_dsi_bridge_detach,
+ .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .atomic_reset = drm_atomic_helper_bridge_reset,
+ .atomic_check = nwl_dsi_bridge_atomic_check,
+ .atomic_enable = nwl_dsi_bridge_atomic_enable,
+ .atomic_disable = nwl_dsi_bridge_atomic_disable,
+ .mode_set = nwl_dsi_bridge_mode_set,
+ .mode_valid = nwl_dsi_bridge_mode_valid,
+ .attach = nwl_dsi_bridge_attach,
+ .detach = nwl_dsi_bridge_detach,
};
static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
--
2.7.4
Hi,
On 22/04/2021 07:14, Liu Ying wrote:
> Some MIPI DSI panel drivers like 'raydium,rm68200' send
> MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> requires the MIPI DSI controller and PHY to be ready beforehand.
> Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> and PHY ready in bridge_funcs->pre_enable(), which happens after
> the panel_funcs->prepare(). So, this patch shifts the bridge operation
> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
This makes sense, this is how we do on the synopsys dw mipi dsi driver.
> This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> are called in pairs, which includes removing a check on unchanged HS
> clock rate and forcing a full modeset when only connector's DPMS is
> brought out of "Off" status.
I would split the changes in multiple patches to clarify the changes.
Neil
>
> Cc: Andrzej Hajda <[email protected]>
> Cc: Neil Armstrong <[email protected]>
> Cc: Robert Foss <[email protected]>
> Cc: Laurent Pinchart <[email protected]>
> Cc: Jonas Karlman <[email protected]>
> Cc: Jernej Skrabec <[email protected]>
> Cc: David Airlie <[email protected]>
> Cc: Daniel Vetter <[email protected]>
> Cc: Guido Günther <[email protected]>
> Cc: Robert Chiras <[email protected]>
> Cc: NXP Linux Team <[email protected]>
> Signed-off-by: Liu Ying <[email protected]>
> ---
> v1->v2:
> * Fix commit message typo - s/unchange/unchanged/
>
> drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
> 1 file changed, 46 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index be6bfc5..229f0b1 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -21,6 +21,7 @@
> #include <linux/sys_soc.h>
> #include <linux/time64.h>
>
> +#include <drm/drm_atomic_state_helper.h>
> #include <drm/drm_bridge.h>
> #include <drm/drm_mipi_dsi.h>
> #include <drm/drm_of.h>
> @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
> return IRQ_HANDLED;
> }
>
> -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
> {
> struct device *dev = dsi->dev;
> union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
> return 0;
> }
>
> -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> +static void
> +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> + struct drm_bridge_state *old_bridge_state)
> {
> struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> int ret;
> @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
> return 0;
> }
>
> -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> - const struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> -{
> - /* At least LCDIF + NWL needs active high sync */
> - adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> - adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> -
> - return true;
> -}
> -
> static enum drm_mode_status
> nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> const struct drm_display_info *info,
> @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> return MODE_OK;
> }
>
> +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> +
> + /* At least LCDIF + NWL needs active high sync */
> + adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> + adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> +
> + /*
> + * Do a full modeset if crtc_state->active is changed to be true.
> + * This ensures our ->mode_set() is called to get the DSI controller
> + * and the PHY ready to send DCS commands, when only the connector's
> + * DPMS is brought out of "Off" status.
> + */
> + if (crtc_state->active_changed && crtc_state->active)
> + crtc_state->mode_changed = true;
> +
> + return 0;
> +}
> +
> static void
> nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> const struct drm_display_mode *mode,
> @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> if (ret < 0)
> return;
>
> - /*
> - * If hs clock is unchanged, we're all good - all parameters are
> - * derived from it atm.
> - */
> - if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> - return;
> -
> phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
> DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
> /* Save the new desired phy config */
> @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>
> memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
> drm_mode_debug_printmodeline(adjusted_mode);
> -}
>
> -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> -{
> - struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> - int ret;
> -
> - pm_runtime_get_sync(dsi->dev);
> + pm_runtime_get_sync(dev);
>
> if (clk_prepare_enable(dsi->lcdif_clk) < 0)
> return;
> @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> /* Step 1 from DSI reset-out instructions */
> ret = reset_control_deassert(dsi->rst_pclk);
> if (ret < 0) {
> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> + DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
> return;
> }
>
> /* Step 2 from DSI reset-out instructions */
> - nwl_dsi_enable(dsi);
> + nwl_dsi_mode_set(dsi);
>
> /* Step 3 from DSI reset-out instructions */
> ret = reset_control_deassert(dsi->rst_esc);
> if (ret < 0) {
> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> + DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
> return;
> }
> ret = reset_control_deassert(dsi->rst_byte);
> if (ret < 0) {
> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> + DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
> return;
> }
> }
>
> -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> +static void
> +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> + struct drm_bridge_state *old_bridge_state)
> {
> struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> int ret;
> @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> }
>
> static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> - .pre_enable = nwl_dsi_bridge_pre_enable,
> - .enable = nwl_dsi_bridge_enable,
> - .disable = nwl_dsi_bridge_disable,
> - .mode_fixup = nwl_dsi_bridge_mode_fixup,
> - .mode_set = nwl_dsi_bridge_mode_set,
> - .mode_valid = nwl_dsi_bridge_mode_valid,
> - .attach = nwl_dsi_bridge_attach,
> - .detach = nwl_dsi_bridge_detach,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_check = nwl_dsi_bridge_atomic_check,
> + .atomic_enable = nwl_dsi_bridge_atomic_enable,
> + .atomic_disable = nwl_dsi_bridge_atomic_disable,
> + .mode_set = nwl_dsi_bridge_mode_set,
> + .mode_valid = nwl_dsi_bridge_mode_valid,
> + .attach = nwl_dsi_bridge_attach,
> + .detach = nwl_dsi_bridge_detach,
> };
>
> static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>
Hi Neil,
On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
> Hi,
>
> On 22/04/2021 07:14, Liu Ying wrote:
> > Some MIPI DSI panel drivers like 'raydium,rm68200' send
> > MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> > requires the MIPI DSI controller and PHY to be ready beforehand.
> > Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> > and PHY ready in bridge_funcs->pre_enable(), which happens after
> > the panel_funcs->prepare(). So, this patch shifts the bridge operation
> > ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
>
> This makes sense, this is how we do on the synopsys dw mipi dsi driver.
>
> > This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> > Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> > are called in pairs, which includes removing a check on unchanged HS
> > clock rate and forcing a full modeset when only connector's DPMS is
> > brought out of "Off" status.
>
> I would split the changes in multiple patches to clarify the changes.
Maybe, I can split this into the below 3 patches:
1) Remove a check on unchanged HS clock rate from ->mode_set().
2) Force a full modeset when only connector's DPMS is brought out of
"Off" status. This will be done in ->atomic_check() together with the
fixup for H/VSYNC polarities.
3) Shift the bridge operation as the last step.
I'll mention that 1) & 2) are needed by 3) in their commit message.
Does this split-up sound reasonable?
Thanks,
Liu Ying
>
> Neil
>
> > Cc: Andrzej Hajda <[email protected]>
> > Cc: Neil Armstrong <[email protected]>
> > Cc: Robert Foss <[email protected]>
> > Cc: Laurent Pinchart <[email protected]>
> > Cc: Jonas Karlman <[email protected]>
> > Cc: Jernej Skrabec <[email protected]>
> > Cc: David Airlie <[email protected]>
> > Cc: Daniel Vetter <[email protected]>
> > Cc: Guido Günther <[email protected]>
> > Cc: Robert Chiras <[email protected]>
> > Cc: NXP Linux Team <[email protected]>
> > Signed-off-by: Liu Ying <[email protected]>
> > ---
> > v1->v2:
> > * Fix commit message typo - s/unchange/unchanged/
> >
> > drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
> > 1 file changed, 46 insertions(+), 40 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> > index be6bfc5..229f0b1 100644
> > --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> > +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> > @@ -21,6 +21,7 @@
> > #include <linux/sys_soc.h>
> > #include <linux/time64.h>
> >
> > +#include <drm/drm_atomic_state_helper.h>
> > #include <drm/drm_bridge.h>
> > #include <drm/drm_mipi_dsi.h>
> > #include <drm/drm_of.h>
> > @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
> > return IRQ_HANDLED;
> > }
> >
> > -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> > +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
> > {
> > struct device *dev = dsi->dev;
> > union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> > @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
> > return 0;
> > }
> >
> > -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> > +static void
> > +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > + struct drm_bridge_state *old_bridge_state)
> > {
> > struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > int ret;
> > @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
> > return 0;
> > }
> >
> > -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> > - const struct drm_display_mode *mode,
> > - struct drm_display_mode *adjusted_mode)
> > -{
> > - /* At least LCDIF + NWL needs active high sync */
> > - adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > - adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > -
> > - return true;
> > -}
> > -
> > static enum drm_mode_status
> > nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > const struct drm_display_info *info,
> > @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > return MODE_OK;
> > }
> >
> > +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> > + struct drm_bridge_state *bridge_state,
> > + struct drm_crtc_state *crtc_state,
> > + struct drm_connector_state *conn_state)
> > +{
> > + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> > +
> > + /* At least LCDIF + NWL needs active high sync */
> > + adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > + adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > +
> > + /*
> > + * Do a full modeset if crtc_state->active is changed to be true.
> > + * This ensures our ->mode_set() is called to get the DSI controller
> > + * and the PHY ready to send DCS commands, when only the connector's
> > + * DPMS is brought out of "Off" status.
> > + */
> > + if (crtc_state->active_changed && crtc_state->active)
> > + crtc_state->mode_changed = true;
> > +
> > + return 0;
> > +}
> > +
> > static void
> > nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > const struct drm_display_mode *mode,
> > @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > if (ret < 0)
> > return;
> >
> > - /*
> > - * If hs clock is unchanged, we're all good - all parameters are
> > - * derived from it atm.
> > - */
> > - if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> > - return;
> > -
> > phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
> > DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
> > /* Save the new desired phy config */
> > @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> >
> > memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
> > drm_mode_debug_printmodeline(adjusted_mode);
> > -}
> >
> > -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > -{
> > - struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > - int ret;
> > -
> > - pm_runtime_get_sync(dsi->dev);
> > + pm_runtime_get_sync(dev);
> >
> > if (clk_prepare_enable(dsi->lcdif_clk) < 0)
> > return;
> > @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > /* Step 1 from DSI reset-out instructions */
> > ret = reset_control_deassert(dsi->rst_pclk);
> > if (ret < 0) {
> > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> > + DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
> > return;
> > }
> >
> > /* Step 2 from DSI reset-out instructions */
> > - nwl_dsi_enable(dsi);
> > + nwl_dsi_mode_set(dsi);
> >
> > /* Step 3 from DSI reset-out instructions */
> > ret = reset_control_deassert(dsi->rst_esc);
> > if (ret < 0) {
> > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> > + DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
> > return;
> > }
> > ret = reset_control_deassert(dsi->rst_byte);
> > if (ret < 0) {
> > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> > + DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
> > return;
> > }
> > }
> >
> > -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> > +static void
> > +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > + struct drm_bridge_state *old_bridge_state)
> > {
> > struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > int ret;
> > @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> > }
> >
> > static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> > - .pre_enable = nwl_dsi_bridge_pre_enable,
> > - .enable = nwl_dsi_bridge_enable,
> > - .disable = nwl_dsi_bridge_disable,
> > - .mode_fixup = nwl_dsi_bridge_mode_fixup,
> > - .mode_set = nwl_dsi_bridge_mode_set,
> > - .mode_valid = nwl_dsi_bridge_mode_valid,
> > - .attach = nwl_dsi_bridge_attach,
> > - .detach = nwl_dsi_bridge_detach,
> > + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> > + .atomic_reset = drm_atomic_helper_bridge_reset,
> > + .atomic_check = nwl_dsi_bridge_atomic_check,
> > + .atomic_enable = nwl_dsi_bridge_atomic_enable,
> > + .atomic_disable = nwl_dsi_bridge_atomic_disable,
> > + .mode_set = nwl_dsi_bridge_mode_set,
> > + .mode_valid = nwl_dsi_bridge_mode_valid,
> > + .attach = nwl_dsi_bridge_attach,
> > + .detach = nwl_dsi_bridge_detach,
> > };
> >
> > static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
> >
Hi,
On 22/04/2021 11:31, Liu Ying wrote:
> Hi Neil,
>
> On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
>> Hi,
>>
>> On 22/04/2021 07:14, Liu Ying wrote:
>>> Some MIPI DSI panel drivers like 'raydium,rm68200' send
>>> MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
>>> requires the MIPI DSI controller and PHY to be ready beforehand.
>>> Without this patch, the nwl-dsi driver gets the MIPI DSI controller
>>> and PHY ready in bridge_funcs->pre_enable(), which happens after
>>> the panel_funcs->prepare(). So, this patch shifts the bridge operation
>>> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
>>
>> This makes sense, this is how we do on the synopsys dw mipi dsi driver.
>>
>>> This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
>>> Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
>>> are called in pairs, which includes removing a check on unchanged HS
>>> clock rate and forcing a full modeset when only connector's DPMS is
>>> brought out of "Off" status.
>>
>> I would split the changes in multiple patches to clarify the changes.
>
> Maybe, I can split this into the below 3 patches:
> 1) Remove a check on unchanged HS clock rate from ->mode_set().
> 2) Force a full modeset when only connector's DPMS is brought out of
> "Off" status. This will be done in ->atomic_check() together with the
> fixup for H/VSYNC polarities.
> 3) Shift the bridge operation as the last step.
>
> I'll mention that 1) & 2) are needed by 3) in their commit message.
Sure, you can also put this split explanation in the cover letter.
>
> Does this split-up sound reasonable?
Yes makes sense, thanks
Neil
>
> Thanks,
> Liu Ying
>
>>
>> Neil
>>
>>> Cc: Andrzej Hajda <[email protected]>
>>> Cc: Neil Armstrong <[email protected]>
>>> Cc: Robert Foss <[email protected]>
>>> Cc: Laurent Pinchart <[email protected]>
>>> Cc: Jonas Karlman <[email protected]>
>>> Cc: Jernej Skrabec <[email protected]>
>>> Cc: David Airlie <[email protected]>
>>> Cc: Daniel Vetter <[email protected]>
>>> Cc: Guido Günther <[email protected]>
>>> Cc: Robert Chiras <[email protected]>
>>> Cc: NXP Linux Team <[email protected]>
>>> Signed-off-by: Liu Ying <[email protected]>
>>> ---
>>> v1->v2:
>>> * Fix commit message typo - s/unchange/unchanged/
>>>
>>> drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
>>> 1 file changed, 46 insertions(+), 40 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
>>> index be6bfc5..229f0b1 100644
>>> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
>>> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
>>> @@ -21,6 +21,7 @@
>>> #include <linux/sys_soc.h>
>>> #include <linux/time64.h>
>>>
>>> +#include <drm/drm_atomic_state_helper.h>
>>> #include <drm/drm_bridge.h>
>>> #include <drm/drm_mipi_dsi.h>
>>> #include <drm/drm_of.h>
>>> @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
>>> return IRQ_HANDLED;
>>> }
>>>
>>> -static int nwl_dsi_enable(struct nwl_dsi *dsi)
>>> +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
>>> {
>>> struct device *dev = dsi->dev;
>>> union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
>>> @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
>>> return 0;
>>> }
>>>
>>> -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
>>> +static void
>>> +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
>>> + struct drm_bridge_state *old_bridge_state)
>>> {
>>> struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>> int ret;
>>> @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
>>> return 0;
>>> }
>>>
>>> -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
>>> - const struct drm_display_mode *mode,
>>> - struct drm_display_mode *adjusted_mode)
>>> -{
>>> - /* At least LCDIF + NWL needs active high sync */
>>> - adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
>>> - adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
>>> -
>>> - return true;
>>> -}
>>> -
>>> static enum drm_mode_status
>>> nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>>> const struct drm_display_info *info,
>>> @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>>> return MODE_OK;
>>> }
>>>
>>> +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
>>> + struct drm_bridge_state *bridge_state,
>>> + struct drm_crtc_state *crtc_state,
>>> + struct drm_connector_state *conn_state)
>>> +{
>>> + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
>>> +
>>> + /* At least LCDIF + NWL needs active high sync */
>>> + adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
>>> + adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
>>> +
>>> + /*
>>> + * Do a full modeset if crtc_state->active is changed to be true.
>>> + * This ensures our ->mode_set() is called to get the DSI controller
>>> + * and the PHY ready to send DCS commands, when only the connector's
>>> + * DPMS is brought out of "Off" status.
>>> + */
>>> + if (crtc_state->active_changed && crtc_state->active)
>>> + crtc_state->mode_changed = true;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> static void
>>> nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>> const struct drm_display_mode *mode,
>>> @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>> if (ret < 0)
>>> return;
>>>
>>> - /*
>>> - * If hs clock is unchanged, we're all good - all parameters are
>>> - * derived from it atm.
>>> - */
>>> - if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
>>> - return;
>>> -
>>> phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
>>> DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
>>> /* Save the new desired phy config */
>>> @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>>
>>> memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
>>> drm_mode_debug_printmodeline(adjusted_mode);
>>> -}
>>>
>>> -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>>> -{
>>> - struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>> - int ret;
>>> -
>>> - pm_runtime_get_sync(dsi->dev);
>>> + pm_runtime_get_sync(dev);
>>>
>>> if (clk_prepare_enable(dsi->lcdif_clk) < 0)
>>> return;
>>> @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>>> /* Step 1 from DSI reset-out instructions */
>>> ret = reset_control_deassert(dsi->rst_pclk);
>>> if (ret < 0) {
>>> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
>>> + DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
>>> return;
>>> }
>>>
>>> /* Step 2 from DSI reset-out instructions */
>>> - nwl_dsi_enable(dsi);
>>> + nwl_dsi_mode_set(dsi);
>>>
>>> /* Step 3 from DSI reset-out instructions */
>>> ret = reset_control_deassert(dsi->rst_esc);
>>> if (ret < 0) {
>>> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
>>> + DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
>>> return;
>>> }
>>> ret = reset_control_deassert(dsi->rst_byte);
>>> if (ret < 0) {
>>> - DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
>>> + DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
>>> return;
>>> }
>>> }
>>>
>>> -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
>>> +static void
>>> +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
>>> + struct drm_bridge_state *old_bridge_state)
>>> {
>>> struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>> int ret;
>>> @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
>>> }
>>>
>>> static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
>>> - .pre_enable = nwl_dsi_bridge_pre_enable,
>>> - .enable = nwl_dsi_bridge_enable,
>>> - .disable = nwl_dsi_bridge_disable,
>>> - .mode_fixup = nwl_dsi_bridge_mode_fixup,
>>> - .mode_set = nwl_dsi_bridge_mode_set,
>>> - .mode_valid = nwl_dsi_bridge_mode_valid,
>>> - .attach = nwl_dsi_bridge_attach,
>>> - .detach = nwl_dsi_bridge_detach,
>>> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>> + .atomic_reset = drm_atomic_helper_bridge_reset,
>>> + .atomic_check = nwl_dsi_bridge_atomic_check,
>>> + .atomic_enable = nwl_dsi_bridge_atomic_enable,
>>> + .atomic_disable = nwl_dsi_bridge_atomic_disable,
>>> + .mode_set = nwl_dsi_bridge_mode_set,
>>> + .mode_valid = nwl_dsi_bridge_mode_valid,
>>> + .attach = nwl_dsi_bridge_attach,
>>> + .detach = nwl_dsi_bridge_detach,
>>> };
>>>
>>> static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>>>
>
Hi Neil,
On Thu, 2021-04-22 at 14:07 +0200, Neil Armstrong wrote:
> Hi,
>
> On 22/04/2021 11:31, Liu Ying wrote:
> > Hi Neil,
> >
> > On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
> > > Hi,
> > >
> > > On 22/04/2021 07:14, Liu Ying wrote:
> > > > Some MIPI DSI panel drivers like 'raydium,rm68200' send
> > > > MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> > > > requires the MIPI DSI controller and PHY to be ready beforehand.
> > > > Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> > > > and PHY ready in bridge_funcs->pre_enable(), which happens after
> > > > the panel_funcs->prepare(). So, this patch shifts the bridge operation
> > > > ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
> > >
> > > This makes sense, this is how we do on the synopsys dw mipi dsi driver.
> > >
> > > > This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> > > > Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> > > > are called in pairs, which includes removing a check on unchanged HS
> > > > clock rate and forcing a full modeset when only connector's DPMS is
> > > > brought out of "Off" status.
> > >
> > > I would split the changes in multiple patches to clarify the changes.
> >
> > Maybe, I can split this into the below 3 patches:
> > 1) Remove a check on unchanged HS clock rate from ->mode_set().
> > 2) Force a full modeset when only connector's DPMS is brought out of
> > "Off" status. This will be done in ->atomic_check() together with the
> > fixup for H/VSYNC polarities.
> > 3) Shift the bridge operation as the last step.
> >
> > I'll mention that 1) & 2) are needed by 3) in their commit message.
>
> Sure, you can also put this split explanation in the cover letter.
>
> > Does this split-up sound reasonable?
>
> Yes makes sense, thanks
I've sent v3 to do the split-up.
I actually swap 1) and 2), which is trivial I assume.
Regards,
Liu Ying
>
> Neil
>
> > Thanks,
> > Liu Ying
> >
> > > Neil
> > >
> > > > Cc: Andrzej Hajda <[email protected]>
> > > > Cc: Neil Armstrong <[email protected]>
> > > > Cc: Robert Foss <[email protected]>
> > > > Cc: Laurent Pinchart <[email protected]>
> > > > Cc: Jonas Karlman <[email protected]>
> > > > Cc: Jernej Skrabec <[email protected]>
> > > > Cc: David Airlie <[email protected]>
> > > > Cc: Daniel Vetter <[email protected]>
> > > > Cc: Guido Günther <[email protected]>
> > > > Cc: Robert Chiras <[email protected]>
> > > > Cc: NXP Linux Team <[email protected]>
> > > > Signed-off-by: Liu Ying <[email protected]>
> > > > ---
> > > > v1->v2:
> > > > * Fix commit message typo - s/unchange/unchanged/
> > > >
> > > > drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
> > > > 1 file changed, 46 insertions(+), 40 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > index be6bfc5..229f0b1 100644
> > > > --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > @@ -21,6 +21,7 @@
> > > > #include <linux/sys_soc.h>
> > > > #include <linux/time64.h>
> > > >
> > > > +#include <drm/drm_atomic_state_helper.h>
> > > > #include <drm/drm_bridge.h>
> > > > #include <drm/drm_mipi_dsi.h>
> > > > #include <drm/drm_of.h>
> > > > @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
> > > > return IRQ_HANDLED;
> > > > }
> > > >
> > > > -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> > > > +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
> > > > {
> > > > struct device *dev = dsi->dev;
> > > > union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> > > > @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
> > > > return 0;
> > > > }
> > > >
> > > > -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> > > > +static void
> > > > +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > > > + struct drm_bridge_state *old_bridge_state)
> > > > {
> > > > struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > > int ret;
> > > > @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
> > > > return 0;
> > > > }
> > > >
> > > > -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> > > > - const struct drm_display_mode *mode,
> > > > - struct drm_display_mode *adjusted_mode)
> > > > -{
> > > > - /* At least LCDIF + NWL needs active high sync */
> > > > - adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > > - adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > > > -
> > > > - return true;
> > > > -}
> > > > -
> > > > static enum drm_mode_status
> > > > nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > > > const struct drm_display_info *info,
> > > > @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > > > return MODE_OK;
> > > > }
> > > >
> > > > +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> > > > + struct drm_bridge_state *bridge_state,
> > > > + struct drm_crtc_state *crtc_state,
> > > > + struct drm_connector_state *conn_state)
> > > > +{
> > > > + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> > > > +
> > > > + /* At least LCDIF + NWL needs active high sync */
> > > > + adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > > + adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > > > +
> > > > + /*
> > > > + * Do a full modeset if crtc_state->active is changed to be true.
> > > > + * This ensures our ->mode_set() is called to get the DSI controller
> > > > + * and the PHY ready to send DCS commands, when only the connector's
> > > > + * DPMS is brought out of "Off" status.
> > > > + */
> > > > + if (crtc_state->active_changed && crtc_state->active)
> > > > + crtc_state->mode_changed = true;
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > static void
> > > > nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > > const struct drm_display_mode *mode,
> > > > @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > > if (ret < 0)
> > > > return;
> > > >
> > > > - /*
> > > > - * If hs clock is unchanged, we're all good - all parameters are
> > > > - * derived from it atm.
> > > > - */
> > > > - if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> > > > - return;
> > > > -
> > > > phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
> > > > DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
> > > > /* Save the new desired phy config */
> > > > @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > >
> > > > memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
> > > > drm_mode_debug_printmodeline(adjusted_mode);
> > > > -}
> > > >
> > > > -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > > > -{
> > > > - struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > > - int ret;
> > > > -
> > > > - pm_runtime_get_sync(dsi->dev);
> > > > + pm_runtime_get_sync(dev);
> > > >
> > > > if (clk_prepare_enable(dsi->lcdif_clk) < 0)
> > > > return;
> > > > @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > > > /* Step 1 from DSI reset-out instructions */
> > > > ret = reset_control_deassert(dsi->rst_pclk);
> > > > if (ret < 0) {
> > > > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> > > > + DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
> > > > return;
> > > > }
> > > >
> > > > /* Step 2 from DSI reset-out instructions */
> > > > - nwl_dsi_enable(dsi);
> > > > + nwl_dsi_mode_set(dsi);
> > > >
> > > > /* Step 3 from DSI reset-out instructions */
> > > > ret = reset_control_deassert(dsi->rst_esc);
> > > > if (ret < 0) {
> > > > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> > > > + DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
> > > > return;
> > > > }
> > > > ret = reset_control_deassert(dsi->rst_byte);
> > > > if (ret < 0) {
> > > > - DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> > > > + DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
> > > > return;
> > > > }
> > > > }
> > > >
> > > > -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> > > > +static void
> > > > +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > > > + struct drm_bridge_state *old_bridge_state)
> > > > {
> > > > struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > > int ret;
> > > > @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> > > > }
> > > >
> > > > static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> > > > - .pre_enable = nwl_dsi_bridge_pre_enable,
> > > > - .enable = nwl_dsi_bridge_enable,
> > > > - .disable = nwl_dsi_bridge_disable,
> > > > - .mode_fixup = nwl_dsi_bridge_mode_fixup,
> > > > - .mode_set = nwl_dsi_bridge_mode_set,
> > > > - .mode_valid = nwl_dsi_bridge_mode_valid,
> > > > - .attach = nwl_dsi_bridge_attach,
> > > > - .detach = nwl_dsi_bridge_detach,
> > > > + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> > > > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> > > > + .atomic_reset = drm_atomic_helper_bridge_reset,
> > > > + .atomic_check = nwl_dsi_bridge_atomic_check,
> > > > + .atomic_enable = nwl_dsi_bridge_atomic_enable,
> > > > + .atomic_disable = nwl_dsi_bridge_atomic_disable,
> > > > + .mode_set = nwl_dsi_bridge_mode_set,
> > > > + .mode_valid = nwl_dsi_bridge_mode_valid,
> > > > + .attach = nwl_dsi_bridge_attach,
> > > > + .detach = nwl_dsi_bridge_detach,
> > > > };
> > > >
> > > > static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
> > > >