Hi Douglas,

Thank you for the patch.

On Thu, May 16, 2019 at 02:40:21PM -0700, Douglas Anderson wrote:

On Rockchip rk3288-based Chromebooks when you do a suspend/resume cycle:

1. You lose the ability to detect an HDMI device being plugged in.

2. If you're using the i2c bus built in to dw_hdmi then it stops

working.

Let's add a hook to the core dw-hdmi driver so that we can call it in dw_hdmi-rockchip in the next commit.

NOTE: the exact set of steps I've done here in resume come from looking at the normal dw_hdmi init sequence in upstream Linux plus the sequence that we did in downstream Chrome OS 3.14. Testing show that it seems to work, but if an extra step is needed or something here is not needed we could improve it.

As part of this change we'll refactor the hardware init bits of dw-hdmi to happen all in one function and all at the same time. Since we need to init the interrupt mutes before we request the IRQ, this means moving the hardware init earlier in the function, but there should be no problems with that. Also as part of this we now unconditionally init the "i2c" parts of dw-hdmi, but again that ought to be fine.

Signed-off-by: Douglas Anderson dianders@chromium.org

Changes in v2:

• No empty stub for suspend (Laurent)
• Refactor to use the same code in probe and resume (Laurent)
• Unconditionally init i2c (seems OK + needed before hdmi->i2c init)
• Combine "init" of i2c and "setup" of i2c (no reason to split)

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 50 ++++++++++++++--------- include/drm/bridge/dw_hdmi.h | 2 + 2 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index ab7968c8f6a2..636d55d1398c 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -227,6 +227,13 @@ static void hdmi_mask_writeb(struct dw_hdmi *hdmi, u8 data, unsigned int reg,

static void dw_hdmi_i2c_init(struct dw_hdmi *hdmi) {

• hdmi_writeb(hdmi, HDMI_PHY_I2CM_INT_ADDR_DONE_POL,

•     HDMI_PHY_I2CM_INT_ADDR);
  

• hdmi_writeb(hdmi, HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL |

•     HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL,
  

•     HDMI_PHY_I2CM_CTLINT_ADDR);
  

• /* Software reset */ hdmi_writeb(hdmi, 0x00, HDMI_I2CM_SOFTRSTZ);

@@ -1925,16 +1932,6 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode) return 0; }

-static void dw_hdmi_setup_i2c(struct dw_hdmi *hdmi) -{

• hdmi_writeb(hdmi, HDMI_PHY_I2CM_INT_ADDR_DONE_POL,

•     HDMI_PHY_I2CM_INT_ADDR);
  

• hdmi_writeb(hdmi, HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL |

•     HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL,
  

•     HDMI_PHY_I2CM_CTLINT_ADDR);
  

-}

static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi) { u8 ih_mute; @@ -2435,6 +2432,21 @@ static const struct regmap_config hdmi_regmap_32bit_config = { .max_register = HDMI_I2CM_FS_SCL_LCNT_0_ADDR << 2, };

+static void dw_hdmi_init_hw(struct dw_hdmi *hdmi) +{

• initialize_hdmi_ih_mutes(hdmi);
• /*

• * Reset HDMI DDC I2C master controller and mute I2CM interrupts.
  

• * Even if we are using a separate i2c adapter doing this doesn't
  

• * hurt.
  

• */
  

• dw_hdmi_i2c_init(hdmi);
• if (hdmi->phy.ops->setup_hpd)

• hdmi->phy.ops->setup_hpd(hdmi, hdmi->phy.data);
  

+}

static struct dw_hdmi * __dw_hdmi_probe(struct platform_device *pdev, const struct dw_hdmi_plat_data *plat_data) @@ -2586,7 +2598,7 @@ __dw_hdmi_probe(struct platform_device *pdev, prod_id1 & HDMI_PRODUCT_ID1_HDCP ? "with" : "without", hdmi->phy.name);

• initialize_hdmi_ih_mutes(hdmi);

• dw_hdmi_init_hw(hdmi);

  irq = platform_get_irq(pdev, 0); if (irq < 0) {

@@ -2625,10 +2637,6 @@ __dw_hdmi_probe(struct platform_device *pdev, hdmi->bridge.of_node = pdev->dev.of_node; #endif

• dw_hdmi_setup_i2c(hdmi);
• if (hdmi->phy.ops->setup_hpd)

• hdmi->phy.ops->setup_hpd(hdmi, hdmi->phy.data);
  

• memset(&pdevinfo, 0, sizeof(pdevinfo)); pdevinfo.parent = dev; pdevinfo.id = PLATFORM_DEVID_AUTO;

@@ -2681,10 +2689,6 @@ __dw_hdmi_probe(struct platform_device *pdev, hdmi->cec = platform_device_register_full(&pdevinfo); }

• /* Reset HDMI DDC I2C master controller and mute I2CM interrupts */
• if (hdmi->i2c)

• dw_hdmi_i2c_init(hdmi);
  

• return hdmi;

err_iahb: @@ -2788,6 +2792,14 @@ void dw_hdmi_unbind(struct dw_hdmi *hdmi) } EXPORT_SYMBOL_GPL(dw_hdmi_unbind);

+int dw_hdmi_resume(struct dw_hdmi *hdmi) +{

• dw_hdmi_init_hw(hdmi);
• return 0;

+}

If the function always returns 0 I would make it void. Apart from that,

Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com

+EXPORT_SYMBOL_GPL(dw_hdmi_resume);

MODULE_AUTHOR("Sascha Hauer s.hauer@pengutronix.de"); MODULE_AUTHOR("Andy Yan andy.yan@rock-chips.com"); MODULE_AUTHOR("Yakir Yang ykk@rock-chips.com"); diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h index 66e70770cce5..1626731e1681 100644 --- a/include/drm/bridge/dw_hdmi.h +++ b/include/drm/bridge/dw_hdmi.h @@ -154,6 +154,8 @@ struct dw_hdmi *dw_hdmi_bind(struct platform_device *pdev, struct drm_encoder *encoder, const struct dw_hdmi_plat_data *plat_data);

+int dw_hdmi_resume(struct dw_hdmi *hdmi);

void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);

void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);