| Message ID | 20190823073448.8385-5-linus.walleij@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/6,v2] drm/msm/mdp4: Drop unused GPIO include | expand |
On Fri, Aug 23, 2019 at 12:35 AM Linus Walleij <linus.walleij@linaro.org> wrote: > > There is elaborate code in the HDMI connector handling to > leave the connector in the state it was at power-on and > only touch the GPIOs when the connector .enable() and > .disable() callbacks are called. > > I don't think this is what we normally want, initialize > the connector as OFF (possibly saving power?) using the > appropriate GPIO descriptor flags. It will still be > switched on/off in the enable()/disable() connector > callback as before, but we can drop some strange surplus > code. I'm picking up the earlier patches in this series.. although I won't have a good way to test on devices which use the hdmi block for a few weeks (when I complete my move, and get back a bunch of boards that are in boxes right now) so I'm going to wait on the last two I think. When we get to dealing with devices with hdmi enabled by bootloader, we may actually want to preserve the pre-probe state of the GPIOs. Although maybe not worth worrying about until we can handle DSI enabled at boot. BR, -R > > Cc: Rob Clark <robdclark@gmail.com> > Cc: Sean Paul <sean@poorly.run> > Cc: linux-arm-msm@vger.kernel.org > Cc: freedreno@lists.freedesktop.org > Reviewed-by: Brian Masney <masneyb@onstation.org> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> > --- > ChangeLog v1->v2: > - Rebased on v5.3-rc1 > - Collected review tag > --- > drivers/gpu/drm/msm/hdmi/hdmi.c | 19 ++++++++++++----- > drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 25 ++++++----------------- > 2 files changed, 20 insertions(+), 24 deletions(-) > > diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c > index 355afb936401..5739eec65659 100644 > --- a/drivers/gpu/drm/msm/hdmi/hdmi.c > +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c > @@ -552,13 +552,22 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data) > for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { > const char *name = msm_hdmi_gpio_pdata[i].name; > struct gpio_desc *gpiod; > + enum gpiod_flags flags; > > /* > - * We are fetching the GPIO lines "as is" since the connector > - * code is enabling and disabling the lines. Until that point > - * the power-on default value will be kept. > + * Notice the inverse set up here: we initialize the connector > + * to OFF state. > */ > - gpiod = devm_gpiod_get_optional(dev, name, GPIOD_ASIS); > + if (msm_hdmi_gpio_pdata[i].output) { > + if (msm_hdmi_gpio_pdata[i].value) > + flags = GPIOD_OUT_LOW; > + else > + flags = GPIOD_OUT_HIGH; > + } else { > + flags = GPIOD_IN; > + } > + > + gpiod = devm_gpiod_get_optional(dev, name, flags); > /* This will catch e.g. -PROBE_DEFER */ > if (IS_ERR(gpiod)) > return PTR_ERR(gpiod); > @@ -572,7 +581,7 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data) > * in the upstream bindings. > */ > if (sscanf(name, "qcom,hdmi-tx-%s", name3)) > - gpiod = devm_gpiod_get_optional(dev, name3, GPIOD_ASIS); > + gpiod = devm_gpiod_get_optional(dev, name3, flags); > if (IS_ERR(gpiod)) > return PTR_ERR(gpiod); > if (!gpiod) > diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c > index d0575d4f747d..f006682935e9 100644 > --- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c > +++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c > @@ -75,16 +75,9 @@ static int gpio_config(struct hdmi *hdmi, bool on) > for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { > struct hdmi_gpio_data gpio = config->gpios[i]; > > - if (gpio.gpiod) { > - if (gpio.output) { > - gpiod_direction_output(gpio.gpiod, > - gpio.value); > - } else { > - gpiod_direction_input(gpio.gpiod); > - gpiod_set_value_cansleep(gpio.gpiod, > - gpio.value); > - } > - } > + /* The value indicates the value for turning things on */ > + if (gpio.gpiod) > + gpiod_set_value_cansleep(gpio.gpiod, gpio.value); > } > > DBG("gpio on"); > @@ -92,16 +85,10 @@ static int gpio_config(struct hdmi *hdmi, bool on) > for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { > struct hdmi_gpio_data gpio = config->gpios[i]; > > - if (!gpio.gpiod) > - continue; > - > - if (gpio.output) { > - int value = gpio.value ? 0 : 1; > - > - gpiod_set_value_cansleep(gpio.gpiod, value); > - } > + /* The inverse value turns stuff off */ > + if (gpio.gpiod && gpio.output) > + gpiod_set_value_cansleep(gpio.gpiod, !gpio.value); > }; > - > DBG("gpio off"); > } > > -- > 2.21.0 >
On Sun, Sep 1, 2019 at 6:28 PM Rob Clark <robdclark@gmail.com> wrote: > I'm picking up the earlier patches in this series.. Thanks a lot :) > although I won't > have a good way to test on devices which use the hdmi block for a few > weeks (when I complete my move, and get back a bunch of boards that > are in boxes right now) so I'm going to wait on the last two I think. That's fine. It is just occasional drive-by coding anyway. Yours, Linus Walleij
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c index 355afb936401..5739eec65659 100644 --- a/drivers/gpu/drm/msm/hdmi/hdmi.c +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c @@ -552,13 +552,22 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data) for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { const char *name = msm_hdmi_gpio_pdata[i].name; struct gpio_desc *gpiod; + enum gpiod_flags flags; /* - * We are fetching the GPIO lines "as is" since the connector - * code is enabling and disabling the lines. Until that point - * the power-on default value will be kept. + * Notice the inverse set up here: we initialize the connector + * to OFF state. */ - gpiod = devm_gpiod_get_optional(dev, name, GPIOD_ASIS); + if (msm_hdmi_gpio_pdata[i].output) { + if (msm_hdmi_gpio_pdata[i].value) + flags = GPIOD_OUT_LOW; + else + flags = GPIOD_OUT_HIGH; + } else { + flags = GPIOD_IN; + } + + gpiod = devm_gpiod_get_optional(dev, name, flags); /* This will catch e.g. -PROBE_DEFER */ if (IS_ERR(gpiod)) return PTR_ERR(gpiod); @@ -572,7 +581,7 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data) * in the upstream bindings. */ if (sscanf(name, "qcom,hdmi-tx-%s", name3)) - gpiod = devm_gpiod_get_optional(dev, name3, GPIOD_ASIS); + gpiod = devm_gpiod_get_optional(dev, name3, flags); if (IS_ERR(gpiod)) return PTR_ERR(gpiod); if (!gpiod) diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c index d0575d4f747d..f006682935e9 100644 --- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c +++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c @@ -75,16 +75,9 @@ static int gpio_config(struct hdmi *hdmi, bool on) for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { struct hdmi_gpio_data gpio = config->gpios[i]; - if (gpio.gpiod) { - if (gpio.output) { - gpiod_direction_output(gpio.gpiod, - gpio.value); - } else { - gpiod_direction_input(gpio.gpiod); - gpiod_set_value_cansleep(gpio.gpiod, - gpio.value); - } - } + /* The value indicates the value for turning things on */ + if (gpio.gpiod) + gpiod_set_value_cansleep(gpio.gpiod, gpio.value); } DBG("gpio on"); @@ -92,16 +85,10 @@ static int gpio_config(struct hdmi *hdmi, bool on) for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) { struct hdmi_gpio_data gpio = config->gpios[i]; - if (!gpio.gpiod) - continue; - - if (gpio.output) { - int value = gpio.value ? 0 : 1; - - gpiod_set_value_cansleep(gpio.gpiod, value); - } + /* The inverse value turns stuff off */ + if (gpio.gpiod && gpio.output) + gpiod_set_value_cansleep(gpio.gpiod, !gpio.value); }; - DBG("gpio off"); }