Hi Sergei, thanks for review On Wed, Mar 14, 2018 at 08:09:52PM +0300, Sergei Shtylyov wrote: > On 03/13/2018 05:30 PM, Jacopo Mondi wrote: > > > Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel > > output decoder. > > > > Signed-off-by: Jacopo Mondi <[email protected]> > [...] > > diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c > > b/drivers/gpu/drm/bridge/thc63lvd1024.c > > new file mode 100644 > > index 0000000..4b059c0 > > --- /dev/null > > +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c > > @@ -0,0 +1,241 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * THC63LVD1024 LVDS to parallel data DRM bridge driver. > > + * > > + * Copyright (C) 2018 Jacopo Mondi <[email protected]> > > + */ > > + > > +#include <drm/drmP.h> > > +#include <drm/drm_bridge.h> > > +#include <drm/drm_panel.h> > > + > > +#include <linux/gpio/consumer.h> > > +#include <linux/of_graph.h> > > +#include <linux/regulator/consumer.h> > > + > > +static const char * const thc63_reg_names[] = { > > + "vcc", "lvcc", "pvcc", "cvcc", }; > > Your bracing style is pretty strange -- neither here nor there. Please > place }; > on the next line...
Yeah, I had doubt about this.. The most common style I found around is
static const char * const foo[] = {
"bar",
"baz",
"...",
};
But seems really too many lines for a bunch of 4 character strings...
>
> [...]
> > +static void thc63_enable(struct drm_bridge *bridge)
> > +{
> > + struct thc63_dev *thc63 = to_thc63(bridge);
> > + struct regulator *vcc;
> > + unsigned int i;
> > + int ret;
> > +
> > + for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
> > + vcc = thc63->vccs[i];
> > + if (vcc) {
> > + ret = regulator_enable(vcc);
> > + if (ret)
>
> You hardly need this variable, could do a call right in this *if*.
>
> [...]
> > +error_vcc_enable:
> > + dev_err(thc63->dev, "Failed to enable regulator %u\n", i);
> > +}
> > +
>
> Why not do this instead of *goto* before?
Well, goto breaks the loop, if I only print out the error message, the
enable sequence will go on and enable the other regulators.
I can print out and break, but I don't see that much benefit
One thing I could do instead, is not only print out the error message,
but disable the already enabled regulators if one fails to start.
>
> > +static void thc63_disable(struct drm_bridge *bridge)
> > +{
> > + struct thc63_dev *thc63 = to_thc63(bridge);
> > + struct regulator *vcc;
> > + unsigned int i;
> > + int ret;
> > +
> > + for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
> > + vcc = thc63->vccs[i];
> > + if (vcc) {
> > + ret = regulator_disable(vcc);
> > + if (ret)
>
> Again, no need for 'ret' whatsoever...
>
> > + goto error_vcc_disable;
> > + }
> > + }
> > +
> > + if (thc63->pwdn)
> > + gpiod_set_value(thc63->pwdn, 1);
> > +
> > + if (thc63->oe)
> > + gpiod_set_value(thc63->oe, 0);
> > +
> > + return;
> > +
> > +error_vcc_disable:
> > + dev_err(thc63->dev, "Failed to disable regulator %u\n", i);
>
> Again, why not do it instead of *goto*?
ditto
>
> [...]
> > +static int thc63_gpio_init(struct thc63_dev *thc63)
> > +{
> > + thc63->pwdn = devm_gpiod_get_optional(thc63->dev, "pwdn",
> > + GPIOD_OUT_LOW);
> > + if (IS_ERR(thc63->pwdn)) {
> > + dev_err(thc63->dev, "Unable to get GPIO \"pwdn\"\n");
>
> "pwdn-gpios" maybe?
>
> > + return PTR_ERR(thc63->pwdn);
> > + }
> > +
> > + thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
> > + if (IS_ERR(thc63->oe)) {
> > + dev_err(thc63->dev, "Unable to get GPIO \"oe\"\n");
>
> "oe-gpios" maybe?
Are you referring to the error message? I can change this, but again, I
see no standards around.
Thanks
j
>
> [...]
>
> MBR, Sergei
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