Hi Jose,
On 03/07/2017 06:12 PM, Jose Abreu wrote:
> Hi Neil,
>
>
> On 07-03-2017 16:42, Neil Armstrong wrote:
>> From: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>>
>> In preparation for adding PHY operations to handle RX SENSE and HPD,
>> group all the PHY interrupt setup code in a single location and extract
>> it to a separate function.
>>
>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 50 ++++++++++++++-----------------
>> 1 file changed, 23 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> index 026a0dc..1ed8bc1 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -1496,7 +1496,7 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>> }
>>
>> /* Wait until we are registered to enable interrupts */
>> -static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>> +static void dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>> {
>> hdmi_writeb(hdmi, HDMI_PHY_I2CM_INT_ADDR_DONE_POL,
>> HDMI_PHY_I2CM_INT_ADDR);
>> @@ -1504,15 +1504,6 @@ static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>> hdmi_writeb(hdmi, HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL |
>> HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL,
>> HDMI_PHY_I2CM_CTLINT_ADDR);
>> -
>> - /* enable cable hot plug irq */
>> - hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
>> -
>> - /* Clear Hotplug interrupts */
>> - hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
>> - HDMI_IH_PHY_STAT0);
>> -
>> - return 0;
>> }
>>
>> static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
>> @@ -1630,6 +1621,26 @@ static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
>> hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
>> }
>>
>> +static void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi)
>> +{
>> + /*
>> + * Configure the PHY RX SENSE and HPD interrupts polarities and clear
>> + * any pending interrupt.
>> + */
>> + hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
>> + hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
>> + HDMI_IH_PHY_STAT0);
>> +
>> + /* Enable cable hot plug irq. */
>> + hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
>> +
>> + /* Clear and unmute interrupts. */
>> + hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
>> + HDMI_IH_PHY_STAT0);
>> + hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
>> + HDMI_IH_MUTE_PHY_STAT0);
>> +}
>> +
>> static enum drm_connector_status
>> dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
>> {
>> @@ -2141,29 +2152,14 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
>> hdmi->ddc = NULL;
>> }
>>
>> - /*
>> - * Configure registers related to HDMI interrupt
>> - * generation before registering IRQ.
>> - */
>
>
> I've seen the databook and HPD interrupts are enabled per default
> (actually I think most of the interrupts are). I'm thinking
> whether we could get spurious interrupts because of not
> configuring HPD before registering IRQ (probably thats why the
> comment was there). How did you test this? I think that if you
> insert the cable before loading modules then you can try to
> emulate this condition. What do you think?
In fact the comment was wrong because it happened after the IRQ register,
and right before the IRQ register the initialize_hdmi_ih_mutes() is already
called to mute all the IRQ sources.
The previous rework moved the IRQ code, so this cleanup is welcome.
But indeed, I did not check this condition, I can try this.
Thanks,
Neil
>
> Best regards,
> Jose Miguel Abreu
>
>> - hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
>> -
>> - /* Clear Hotplug interrupts */
>> - hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
>> - HDMI_IH_PHY_STAT0);
>> -
>> hdmi->bridge.driver_private = hdmi;
>> hdmi->bridge.funcs = &dw_hdmi_bridge_funcs;
>> #ifdef CONFIG_OF
>> hdmi->bridge.of_node = pdev->dev.of_node;
>> #endif
>>
>> - ret = dw_hdmi_fb_registered(hdmi);
>> - if (ret)
>> - goto err_iahb;
>> -
>> - /* Unmute interrupts */
>> - hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
>> - HDMI_IH_MUTE_PHY_STAT0);
>> + dw_hdmi_fb_registered(hdmi);
>> + dw_hdmi_phy_setup_hpd(hdmi);
>>
>> memset(&pdevinfo, 0, sizeof(pdevinfo));
>> pdevinfo.parent = dev;
