Re: [RFC][PATCH 5/5 v2] drm/bridge: adv7511: Reuse __adv7511_power_on/off() when probing EDID

Archit Taneja
2016-11-30T04:42:37Z

On 11/29/2016 10:34 AM, John Stultz wrote:
> I've found that by just turning the chip on and off via the
> POWER_DOWN register, I end up getting i2c_transfer errors
> on HiKey.
>
> Investigating further, it seems some of the register state
> in the regmap cache is somehow getting lost. Using the logic
> in __adv7511_power_on/off() which syncs and dirtys the cache
> avoids this issue.
>
> Thus this patch changes the EDID probing logic so that we
> re-use the __adv7511_power_on/off() calls.
>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Archit Taneja <architt@codeaurora.org>
> Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> ---
> v2: Split into two patches to make the change more clear.
> Also provided more rational as to why the change is
> important.
>
> drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 17 +++--------------
> 1 file changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index 1948968..487b33d 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -559,24 +559,13 @@ static int adv7511_get_modes(struct adv7511 *adv7511,
> unsigned int count;
>
> /* Reading the EDID only works if the device is powered */
> - if (!adv7511->powered) {
> - regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
> - ADV7511_POWER_POWER_DOWN, 0);
> - if (adv7511->i2c_main->irq) {
> - regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
> - ADV7511_INT0_EDID_READY);
> - regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
> - ADV7511_INT1_DDC_ERROR);
> - }
> - adv7511->current_edid_segment = -1;
> - }
> + if (!adv7511->powered)
> + __adv7511_power_on(adv7511);

In terms of changes in terms of register configurations, replacing with
__adv7511_power_on() here would add a register write to ADV7511_REG_POWER2
as discussed before.

Also, after the patch that enables HPD, we'd also be adding the ADV7511_INT0_HPD
bit in ADV7511_REG_INT_ENABLE(0).

I am not entirely sure about what effect adding POWER2 would have. If we don't
see any negative effects because of it, I think we should be fine.

The extra HPD bit in INT_ENABLE(0) shouldn't be a problem, though. In fact, it
prevents the HPD mask from being cleared after we get_modes is called, which may
have resulted in us missing out on HPD interrupts.

Thanks,
Archit

>
> edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
>
> if (!adv7511->powered)
> - regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
> - ADV7511_POWER_POWER_DOWN,
> - ADV7511_POWER_POWER_DOWN);
> + __adv7511_power_off(adv7511);
>
> kfree(adv7511->edid);
> adv7511->edid = edid;
>

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