[PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Jernej Skrabec]

m divider in DDC clock register is 4 bits wide. Fix that.

Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
 drivers/gpu/drm/sun4i/sun4i_hdmi.h         | 2 +-
 drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi.h b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
index 7ad3f06c127e..00ca35f07ba5 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
@@ -148,7 +148,7 @@
 #define SUN4I_HDMI_DDC_CMD_IMPLICIT_WRITE	3
 
 #define SUN4I_HDMI_DDC_CLK_REG		0x528
-#define SUN4I_HDMI_DDC_CLK_M(m)			(((m) & 0x7) << 3)
+#define SUN4I_HDMI_DDC_CLK_M(m)			(((m) & 0xf) << 3)
 #define SUN4I_HDMI_DDC_CLK_N(n)			((n) & 0x7)
 
 #define SUN4I_HDMI_DDC_LINE_CTRL_REG	0x540
diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
index 2ff780114106..12430b9d4e93 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
@@ -33,7 +33,7 @@ static unsigned long sun4i_ddc_calc_divider(unsigned long rate,
 	unsigned long best_rate = 0;
 	u8 best_m = 0, best_n = 0, _m, _n;
 
-	for (_m = 0; _m < 8; _m++) {
+	for (_m = 0; _m < 16; _m++) {
 		for (_n = 0; _n < 8; _n++) {
 			unsigned long tmp_rate;
 
-- 
2.26.0

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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Chen-Yu Tsai]

On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec <jernej.skrabec@siol.net> wrote:
>
> m divider in DDC clock register is 4 bits wide. Fix that.
>
> Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Chen-Yu Tsai]

On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
>
> On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec <jernej.skrabec@siol.net> wrote:
> >
> > m divider in DDC clock register is 4 bits wide. Fix that.
> >
> > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
>
> Reviewed-by: Chen-Yu Tsai <wens@csie.org>

Cc stable?
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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Jernej Škrabec]

Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai napisal(a):
> On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec <jernej.skrabec@siol.net> 
wrote:
> > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > 
> > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > 
> > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> 
> Cc stable?

I don't think it's necessary:
1. It doesn't change much (anything?) for me when reading EDID. I don't think 
it's super important to have precise DDC clock in order to properly read EDID.
2. No matter if it has "Cc stable" tag or not, it will be eventually picked 
for stable due to fixes tag.

This was only small observation when I was researching EDID readout issue on 
A20 board, but sadly, I wasn't able to figure out why reading it sometimes 
fails. I noticed similar issue on SoCs with DE2 (most prominently on OrangePi 
PC2 - H5), but there was easy workaround - I just disabled video driver in U-
Boot. However, if A20 display driver gets disabled in U-Boot, it totally 
breaks video output on my TV when Linux boots (no output). I guess there is 
more fundamental problem with clocks than just field size. I think we should 
add more constraints in clock driver, like preset some clock parents and not 
allow to change parents when setting rate, but carefully, so simplefb doesn't 
break. Such constraints should also solve problems with dual head setups.

Best regards,
Jernej



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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 2119 bytes --]

On Mon, Apr 13, 2020 at 06:09:08PM +0200, Jernej Škrabec wrote:
> Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai napisal(a):
> > On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec <jernej.skrabec@siol.net>
> wrote:
> > > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > >
> > > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > >
> > > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> >
> > Cc stable?
>
> I don't think it's necessary:
> 1. It doesn't change much (anything?) for me when reading EDID. I don't think
> it's super important to have precise DDC clock in order to properly read EDID.
> 2. No matter if it has "Cc stable" tag or not, it will be eventually picked
> for stable due to fixes tag.
>
> This was only small observation when I was researching EDID readout issue on
> A20 board, but sadly, I wasn't able to figure out why reading it sometimes
> fails. I noticed similar issue on SoCs with DE2 (most prominently on OrangePi
> PC2 - H5), but there was easy workaround - I just disabled video driver in U-
> Boot. However, if A20 display driver gets disabled in U-Boot, it totally
> breaks video output on my TV when Linux boots (no output). I guess there is
> more fundamental problem with clocks than just field size. I think we should
> add more constraints in clock driver, like preset some clock parents and not
> allow to change parents when setting rate, but carefully, so simplefb doesn't
> break. Such constraints should also solve problems with dual head setups.

I disagree here. Doing all sorts of special case just doesn't scale,
and we'll never have the special cases sorted out on all the boards
(and it's a nightmare to maintain).

Especially since it's basically putting a blanket over the actual
issue and looking the other way. If there's something wrong with how
we deal with (re)parenting, we should fix that. It impacts more than
just DRM, and all the SoCs.

Maxime

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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Jernej Škrabec]

Dne sreda, 15. april 2020 ob 12:42:14 CEST je Maxime Ripard napisal(a):
> On Mon, Apr 13, 2020 at 06:09:08PM +0200, Jernej Škrabec wrote:
> > Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai 
napisal(a):
> > > On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec
> > > > <jernej.skrabec@siol.net>
> > 
> > wrote:
> > > > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > > > 
> > > > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > > 
> > > > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> > > 
> > > Cc stable?
> > 
> > I don't think it's necessary:
> > 1. It doesn't change much (anything?) for me when reading EDID. I don't
> > think it's super important to have precise DDC clock in order to properly
> > read EDID. 2. No matter if it has "Cc stable" tag or not, it will be
> > eventually picked for stable due to fixes tag.
> > 
> > This was only small observation when I was researching EDID readout issue
> > on A20 board, but sadly, I wasn't able to figure out why reading it
> > sometimes fails. I noticed similar issue on SoCs with DE2 (most
> > prominently on OrangePi PC2 - H5), but there was easy workaround - I just
> > disabled video driver in U- Boot. However, if A20 display driver gets
> > disabled in U-Boot, it totally breaks video output on my TV when Linux
> > boots (no output). I guess there is more fundamental problem with clocks
> > than just field size. I think we should add more constraints in clock
> > driver, like preset some clock parents and not allow to change parents
> > when setting rate, but carefully, so simplefb doesn't break. Such
> > constraints should also solve problems with dual head setups.
> I disagree here. Doing all sorts of special case just doesn't scale,
> and we'll never have the special cases sorted out on all the boards
> (and it's a nightmare to maintain).
> 
> Especially since it's basically putting a blanket over the actual
> issue and looking the other way. If there's something wrong with how
> we deal with (re)parenting, we should fix that. It impacts more than
> just DRM, and all the SoCs.

I agree with you that automatic solution would be best, but I just don't see 
it how it would be done. Dual head display pipeline is pretty complex for 
clock driver to get it right on it's own. There are different possible setups 
and some of them are hot pluggable, like HDMI. And there are also SoC specific 
quirks, like A64, where for some reason, MIPI DPHY and HDMI PHY share same 
clock parent - PLL_VIDEO0. Technically, MIPI DPHY can be clocked from 
PLL_PERIPH0 (fixed to 600 MHz), but that's not really helpful. I'm not even 
sure if there is any good solution to this - certainly HDMI and MIPI can't 
claim exclusivity and somehow best common rate must be found for PLL_VIDEO0, 
if that's even possible. I was sure that HDMI PHY on A64 can be clocked from 
PLL_VIDEO1, which would solve main issue, but to date, I didn't find any way to 
do that.

That's pretty off topic, so I hope original patch can be merged as-is.

Best regards,
Jernej


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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 3754 bytes --]

Hi,

On Wed, Apr 15, 2020 at 07:52:28PM +0200, Jernej Škrabec wrote:
> Dne sreda, 15. april 2020 ob 12:42:14 CEST je Maxime Ripard napisal(a):
> > On Mon, Apr 13, 2020 at 06:09:08PM +0200, Jernej Škrabec wrote:
> > > Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai 
> napisal(a):
> > > > On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > > > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec
> > > > > <jernej.skrabec@siol.net>
> > > 
> > > wrote:
> > > > > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > > > > 
> > > > > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > > > 
> > > > > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> > > > 
> > > > Cc stable?
> > > 
> > > I don't think it's necessary:
> > > 1. It doesn't change much (anything?) for me when reading EDID. I don't
> > > think it's super important to have precise DDC clock in order to properly
> > > read EDID. 2. No matter if it has "Cc stable" tag or not, it will be
> > > eventually picked for stable due to fixes tag.
> > > 
> > > This was only small observation when I was researching EDID readout issue
> > > on A20 board, but sadly, I wasn't able to figure out why reading it
> > > sometimes fails. I noticed similar issue on SoCs with DE2 (most
> > > prominently on OrangePi PC2 - H5), but there was easy workaround - I just
> > > disabled video driver in U- Boot. However, if A20 display driver gets
> > > disabled in U-Boot, it totally breaks video output on my TV when Linux
> > > boots (no output). I guess there is more fundamental problem with clocks
> > > than just field size. I think we should add more constraints in clock
> > > driver, like preset some clock parents and not allow to change parents
> > > when setting rate, but carefully, so simplefb doesn't break. Such
> > > constraints should also solve problems with dual head setups.
> > I disagree here. Doing all sorts of special case just doesn't scale,
> > and we'll never have the special cases sorted out on all the boards
> > (and it's a nightmare to maintain).
> > 
> > Especially since it's basically putting a blanket over the actual
> > issue and looking the other way. If there's something wrong with how
> > we deal with (re)parenting, we should fix that. It impacts more than
> > just DRM, and all the SoCs.
> 
> I agree with you that automatic solution would be best, but I just don't see
> it how it would be done.

> Dual head display pipeline is pretty complex for clock driver to get it right
> on it's own. There are different possible setups and some of them are hot
> pluggable, like HDMI.

Do you have an actual scenario that is broken right now?

> And there are also SoC specific quirks, like A64, where for some reason, MIPI
> DPHY and HDMI PHY share same clock parent - PLL_VIDEO0. Technically, MIPI DPHY
> can be clocked from PLL_PERIPH0 (fixed to 600 MHz), but that's not really
> helpful. I'm not even sure if there is any good solution to this - certainly
> HDMI and MIPI can't claim exclusivity and somehow best common rate must be
> found for PLL_VIDEO0, if that's even possible.

IIRC the DSI DPHY needs a clock running at 297MHz, which is pretty much what the
HDMI PHY should need too (or 148.5, but that's pretty easy to generate from
297). So which problem do we have there?

> I was sure that HDMI PHY on A64 can be clocked from PLL_VIDEO1, which would
> solve main issue, but to date, I didn't find any way to do that.
> 
> That's pretty off topic, so I hope original patch can be merged as-is.

It does, sorry

Acked-by: Maxime Ripard <maxime@cerno.tech>

Maxime

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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Chen-Yu Tsai]

On Wed, Apr 22, 2020 at 5:23 PM Maxime Ripard <maxime@cerno.tech> wrote:
>
> Hi,
>
> On Wed, Apr 15, 2020 at 07:52:28PM +0200, Jernej Škrabec wrote:
> > Dne sreda, 15. april 2020 ob 12:42:14 CEST je Maxime Ripard napisal(a):
> > > On Mon, Apr 13, 2020 at 06:09:08PM +0200, Jernej Škrabec wrote:
> > > > Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai
> > napisal(a):
> > > > > On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > > > > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec
> > > > > > <jernej.skrabec@siol.net>
> > > >
> > > > wrote:
> > > > > > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > > > > >
> > > > > > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > > > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > > > >
> > > > > > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> > > > >
> > > > > Cc stable?
> > > >
> > > > I don't think it's necessary:
> > > > 1. It doesn't change much (anything?) for me when reading EDID. I don't
> > > > think it's super important to have precise DDC clock in order to properly
> > > > read EDID. 2. No matter if it has "Cc stable" tag or not, it will be
> > > > eventually picked for stable due to fixes tag.
> > > >
> > > > This was only small observation when I was researching EDID readout issue
> > > > on A20 board, but sadly, I wasn't able to figure out why reading it
> > > > sometimes fails. I noticed similar issue on SoCs with DE2 (most
> > > > prominently on OrangePi PC2 - H5), but there was easy workaround - I just
> > > > disabled video driver in U- Boot. However, if A20 display driver gets
> > > > disabled in U-Boot, it totally breaks video output on my TV when Linux
> > > > boots (no output). I guess there is more fundamental problem with clocks
> > > > than just field size. I think we should add more constraints in clock
> > > > driver, like preset some clock parents and not allow to change parents
> > > > when setting rate, but carefully, so simplefb doesn't break. Such
> > > > constraints should also solve problems with dual head setups.
> > > I disagree here. Doing all sorts of special case just doesn't scale,
> > > and we'll never have the special cases sorted out on all the boards
> > > (and it's a nightmare to maintain).
> > >
> > > Especially since it's basically putting a blanket over the actual
> > > issue and looking the other way. If there's something wrong with how
> > > we deal with (re)parenting, we should fix that. It impacts more than
> > > just DRM, and all the SoCs.
> >
> > I agree with you that automatic solution would be best, but I just don't see
> > it how it would be done.
>
> > Dual head display pipeline is pretty complex for clock driver to get it right
> > on it's own. There are different possible setups and some of them are hot
> > pluggable, like HDMI.
>
> Do you have an actual scenario that is broken right now?
>
> > And there are also SoC specific quirks, like A64, where for some reason, MIPI
> > DPHY and HDMI PHY share same clock parent - PLL_VIDEO0. Technically, MIPI DPHY
> > can be clocked from PLL_PERIPH0 (fixed to 600 MHz), but that's not really
> > helpful. I'm not even sure if there is any good solution to this - certainly
> > HDMI and MIPI can't claim exclusivity and somehow best common rate must be
> > found for PLL_VIDEO0, if that's even possible.
>
> IIRC the DSI DPHY needs a clock running at 297MHz, which is pretty much what the
> HDMI PHY should need too (or 148.5, but that's pretty easy to generate from
> 297). So which problem do we have there?
>
> > I was sure that HDMI PHY on A64 can be clocked from PLL_VIDEO1, which would
> > solve main issue, but to date, I didn't find any way to do that.
> >
> > That's pretty off topic, so I hope original patch can be merged as-is.
>
> It does, sorry
>
> Acked-by: Maxime Ripard <maxime@cerno.tech>

Looks like this hasn't landed yet.

ChenYu
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Re: [PATCH] drm/sun4i: hdmi ddc clk: Fix size of m divider

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 4244 bytes --]

On Thu, Jun 04, 2020 at 01:19:32PM +0800, Chen-Yu Tsai wrote:
> On Wed, Apr 22, 2020 at 5:23 PM Maxime Ripard <maxime@cerno.tech> wrote:
> >
> > Hi,
> >
> > On Wed, Apr 15, 2020 at 07:52:28PM +0200, Jernej Škrabec wrote:
> > > Dne sreda, 15. april 2020 ob 12:42:14 CEST je Maxime Ripard napisal(a):
> > > > On Mon, Apr 13, 2020 at 06:09:08PM +0200, Jernej Škrabec wrote:
> > > > > Dne ponedeljek, 13. april 2020 ob 16:12:39 CEST je Chen-Yu Tsai
> > > napisal(a):
> > > > > > On Mon, Apr 13, 2020 at 6:11 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > > > > > On Mon, Apr 13, 2020 at 5:55 PM Jernej Skrabec
> > > > > > > <jernej.skrabec@siol.net>
> > > > >
> > > > > wrote:
> > > > > > > > m divider in DDC clock register is 4 bits wide. Fix that.
> > > > > > > >
> > > > > > > > Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> > > > > > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > > > > >
> > > > > > > Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> > > > > >
> > > > > > Cc stable?
> > > > >
> > > > > I don't think it's necessary:
> > > > > 1. It doesn't change much (anything?) for me when reading EDID. I don't
> > > > > think it's super important to have precise DDC clock in order to properly
> > > > > read EDID. 2. No matter if it has "Cc stable" tag or not, it will be
> > > > > eventually picked for stable due to fixes tag.
> > > > >
> > > > > This was only small observation when I was researching EDID readout issue
> > > > > on A20 board, but sadly, I wasn't able to figure out why reading it
> > > > > sometimes fails. I noticed similar issue on SoCs with DE2 (most
> > > > > prominently on OrangePi PC2 - H5), but there was easy workaround - I just
> > > > > disabled video driver in U- Boot. However, if A20 display driver gets
> > > > > disabled in U-Boot, it totally breaks video output on my TV when Linux
> > > > > boots (no output). I guess there is more fundamental problem with clocks
> > > > > than just field size. I think we should add more constraints in clock
> > > > > driver, like preset some clock parents and not allow to change parents
> > > > > when setting rate, but carefully, so simplefb doesn't break. Such
> > > > > constraints should also solve problems with dual head setups.
> > > > I disagree here. Doing all sorts of special case just doesn't scale,
> > > > and we'll never have the special cases sorted out on all the boards
> > > > (and it's a nightmare to maintain).
> > > >
> > > > Especially since it's basically putting a blanket over the actual
> > > > issue and looking the other way. If there's something wrong with how
> > > > we deal with (re)parenting, we should fix that. It impacts more than
> > > > just DRM, and all the SoCs.
> > >
> > > I agree with you that automatic solution would be best, but I just don't see
> > > it how it would be done.
> >
> > > Dual head display pipeline is pretty complex for clock driver to get it right
> > > on it's own. There are different possible setups and some of them are hot
> > > pluggable, like HDMI.
> >
> > Do you have an actual scenario that is broken right now?
> >
> > > And there are also SoC specific quirks, like A64, where for some reason, MIPI
> > > DPHY and HDMI PHY share same clock parent - PLL_VIDEO0. Technically, MIPI DPHY
> > > can be clocked from PLL_PERIPH0 (fixed to 600 MHz), but that's not really
> > > helpful. I'm not even sure if there is any good solution to this - certainly
> > > HDMI and MIPI can't claim exclusivity and somehow best common rate must be
> > > found for PLL_VIDEO0, if that's even possible.
> >
> > IIRC the DSI DPHY needs a clock running at 297MHz, which is pretty much what the
> > HDMI PHY should need too (or 148.5, but that's pretty easy to generate from
> > 297). So which problem do we have there?
> >
> > > I was sure that HDMI PHY on A64 can be clocked from PLL_VIDEO1, which would
> > > solve main issue, but to date, I didn't find any way to do that.
> > >
> > > That's pretty off topic, so I hope original patch can be merged as-is.
> >
> > It does, sorry
> >
> > Acked-by: Maxime Ripard <maxime@cerno.tech>
> 
> Looks like this hasn't landed yet.

I just applied it.

Maxime

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