Re: [PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Hi Geert, Laurent,
On 30/11/2022 21:18, Geert Uytterhoeven wrote:
Hi Tomi,
On Wed, Nov 23, 2022 at 8:00 AM Tomi Valkeinen
wrote:
Add clocks related to display which are needed to get the DSI output
working.
Extracted from Renesas BSP tree.
Signed-off-by: Tomi Valkeinen
Reviewed-by: Kieran Bingham
Reviewed-by: Laurent Pinchart
Thanks for your patch!
--- a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
@@ -145,6 +145,8 @@ static const struct cpg_core_clk r8a779g0_core_clks[]
__initconst = {
DEF_FIXED("viobusd2", R8A779G0_CLK_VIOBUSD2, CLK_VIO,2, 1),
DEF_FIXED("vcbus", R8A779G0_CLK_VCBUS, CLK_VC, 1, 1),
DEF_FIXED("vcbusd2",R8A779G0_CLK_VCBUSD2, CLK_VC, 2, 1),
+ DEF_FIXED("dsiref", R8A779G0_CLK_DSIREF,CLK_PLL5_DIV4, 48, 1),
+ DEF_DIV6P1("dsiext",R8A779G0_CLK_DSIEXT,CLK_PLL5_DIV4, 0x884),
DEF_GEN4_SDH("sd0h",R8A779G0_CLK_SD0H, CLK_SDSRC,
0x870),
DEF_GEN4_SD("sd0", R8A779G0_CLK_SD0, R8A779G0_CLK_SD0H,
0x870),
@@ -161,6 +163,14 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
__initconst = {
DEF_MOD("avb0", 211,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb1", 212,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb2", 213,R8A779G0_CLK_S0D4_HSC),
+
Weird horizontal and vertical spacing below...
+ DEF_MOD("dis0", 411,R8A779G0_CLK_S0D3),
I doubt this parent clock is correct.
Based on Table 8.1.4e ("Lists of CPG clocks generated from PLL5"),
this should be one of the VIOBUS clocks.
VIOBUSD2 has the same rate as S0D3, so I'd use that one.
+ DEF_MOD("dsitxlink0", 415,R8A779G0_CLK_DSIREF),
+ DEF_MOD("dsitxlink1", 416,R8A779G0_CLK_DSIREF),
Now that you started questioning about the clocks, I started to wonder
about the DSI clocks. They don't quite make sense to me, but here also I
just assumed it's "fine" as I copied it and it works.
The VIOBUS & VIOBUSD2 are marked to as going to the DSI. But we don't
actually mark any of the DSI clocks as coming from those sources.
DSIREF is quite clear, it's the source for DSI PLL.
DSIEXT goes to the DSI PHY and is also marked to be used for LP-TX.
In the DT we have now:
clocks = <&cpg CPG_MOD 415>,
<&cpg CPG_CORE R8A779G0_CLK_DSIEXT>,
<&cpg CPG_CORE R8A779G0_CLK_DSIREF>;
clock-names = "fck", "dsi", "pll";
The "dsi" clock name is a bit vague, but maybe it's "not fclk, not pll,
but still needed for dsi"? =)
Is it ok to refer to DSIEXT & DSIREF like that, or should they be in the
r8a779g0_mod_clks list? Or is that list for fclks only?
So the fclk in the dts is mod clock 415 (416 for the second dsi), which
is dsitxlink0 or dsitxlink1. Well, those names don't quite make sense if
it's a fclk.
I would rename those clocks to "dsi0" and "dsi1", and source them from
R8A779G0_CLK_VIOBUSD2, similarly to the other video clocks.
Does the above make sense?
Tomi
Re: [PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Hi,
On 30/11/2022 21:18, Geert Uytterhoeven wrote:
Hi Tomi,
On Wed, Nov 23, 2022 at 8:00 AM Tomi Valkeinen
wrote:
Add clocks related to display which are needed to get the DSI output
working.
Extracted from Renesas BSP tree.
Signed-off-by: Tomi Valkeinen
Reviewed-by: Kieran Bingham
Reviewed-by: Laurent Pinchart
Thanks for your patch!
--- a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
@@ -145,6 +145,8 @@ static const struct cpg_core_clk r8a779g0_core_clks[]
__initconst = {
DEF_FIXED("viobusd2", R8A779G0_CLK_VIOBUSD2, CLK_VIO,2, 1),
DEF_FIXED("vcbus", R8A779G0_CLK_VCBUS, CLK_VC, 1, 1),
DEF_FIXED("vcbusd2",R8A779G0_CLK_VCBUSD2, CLK_VC, 2, 1),
+ DEF_FIXED("dsiref", R8A779G0_CLK_DSIREF,CLK_PLL5_DIV4, 48, 1),
+ DEF_DIV6P1("dsiext",R8A779G0_CLK_DSIEXT,CLK_PLL5_DIV4, 0x884),
DEF_GEN4_SDH("sd0h",R8A779G0_CLK_SD0H, CLK_SDSRC,
0x870),
DEF_GEN4_SD("sd0", R8A779G0_CLK_SD0, R8A779G0_CLK_SD0H,
0x870),
@@ -161,6 +163,14 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
__initconst = {
DEF_MOD("avb0", 211,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb1", 212,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb2", 213,R8A779G0_CLK_S0D4_HSC),
+
Weird horizontal and vertical spacing below...
Yep. I added those to keep the lines more visible for me while working
on this, but forgot to remove.
+ DEF_MOD("dis0", 411,R8A779G0_CLK_S0D3),
I doubt this parent clock is correct.
Based on Table 8.1.4e ("Lists of CPG clocks generated from PLL5"),
this should be one of the VIOBUS clocks.
VIOBUSD2 has the same rate as S0D3, so I'd use that one.
I'm pretty clueless about Renesas clocks, and I can't find a nice
clock-tree picture from the docs, but looking at the table, what you say
makes sense.
Both VIOBUS and VIOBUSD2 are marked to go to the video IPs, but with a
bit of browsing, I can't find any more info about the clocking. Afaik,
we don't care about the dis0 rate in the driver, so... Basically any
clock will work here =). I'll pick VIOBUSD2 as you suggest (why would
there be a /2 clock if it's not used...).
+ DEF_MOD("dsitxlink0", 415,R8A779G0_CLK_DSIREF),
+ DEF_MOD("dsitxlink1", 416,R8A779G0_CLK_DSIREF),
+
+ DEF_MOD("fcpvd0", 508,R8A779G0_CLK_S0D3),
+ DEF_MOD("fcpvd1", 509,R8A779G0_CLK_S0D3),
Likewise.
Ack.
+
DEF_MOD("hscif0", 514,R8A779G0_CLK_SASYNCPERD1),
DEF_MOD("hscif1", 515,R8A779G0_CLK_SASYNCPERD1),
DEF_MOD("hscif2", 516,R8A779G0_CLK_SASYNCPERD1),
@@ -193,6 +203,10 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
__initconst = {
DEF_MOD("tmu3", 716,R8A779G0_CLK_SASYNCPERD2),
DEF_MOD("tmu4", 717,R8A779G0_CLK_SASYNCPERD2),
DEF_MOD("tpu0", 718,R8A779G0_CLK_SASYNCPERD4),
+
+ DEF_MOD("vspd0",830,R8A779G0_CLK_S0D1_VIO),
+ DEF_MOD("vspd1",831,R8A779G0_CLK_S0D1_VIO),
While S0D1_VIO is a VIO clock, it is clocked from PLL1, which supports
spread-spectrum, unlike PLL5.
Again, based on Table 8.1.4e ("Lists of CPG clocks generated from
PLL5"), this should be one of the VIOBUS clocks.
Yep.
Not that all of this matters a lot: all of these parents are always-on,
and I think "dis0" is the only clock where we care about the actual
clock rate?
No, of the clocks added above, in the drivers we only care about the
dsiref rate. That's used for the DSI PLL, and that PLL is used as the
DU's pclk.
Tomi
Re: [PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Hi Tomi,
On Thu, Dec 1, 2022 at 10:26 AM Tomi Valkeinen
wrote:
> On 30/11/2022 21:18, Geert Uytterhoeven wrote:
> > On Wed, Nov 23, 2022 at 8:00 AM Tomi Valkeinen
> > wrote:
> >> Add clocks related to display which are needed to get the DSI output
> >> working.
> >>
> >> Extracted from Renesas BSP tree.
> >>
> >> Signed-off-by: Tomi Valkeinen
> >> Reviewed-by: Kieran Bingham
> >> Reviewed-by: Laurent Pinchart
> >> --- a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
> >> +++ b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
> >> + DEF_MOD("dis0", 411,R8A779G0_CLK_S0D3),
> >
> > I doubt this parent clock is correct.
> > Based on Table 8.1.4e ("Lists of CPG clocks generated from PLL5"),
> > this should be one of the VIOBUS clocks.
> > VIOBUSD2 has the same rate as S0D3, so I'd use that one.
> >
> >> + DEF_MOD("dsitxlink0", 415,R8A779G0_CLK_DSIREF),
> >> + DEF_MOD("dsitxlink1", 416,R8A779G0_CLK_DSIREF),
>
> Now that you started questioning about the clocks, I started to wonder
> about the DSI clocks. They don't quite make sense to me, but here also I
> just assumed it's "fine" as I copied it and it works.
>
> The VIOBUS & VIOBUSD2 are marked to as going to the DSI. But we don't
> actually mark any of the DSI clocks as coming from those sources.
>
> DSIREF is quite clear, it's the source for DSI PLL.
>
> DSIEXT goes to the DSI PHY and is also marked to be used for LP-TX.
>
> In the DT we have now:
>
> clocks = <&cpg CPG_MOD 415>,
> <&cpg CPG_CORE R8A779G0_CLK_DSIEXT>,
> <&cpg CPG_CORE R8A779G0_CLK_DSIREF>;
> clock-names = "fck", "dsi", "pll";
>
> The "dsi" clock name is a bit vague, but maybe it's "not fclk, not pll,
> but still needed for dsi"? =)
>
> Is it ok to refer to DSIEXT & DSIREF like that, or should they be in the
Sounds fine to me.
> r8a779g0_mod_clks list? Or is that list for fclks only?
That list is only for clocks which have a bit in an MSTPCR (module
stop control register, Section 9.2.3). These are typically controlled
through the Clock Domain and Runtime PM (but not for the DU, as there
is always only a single node in DT, even when the DU has multiple module
clocks on R-Car Gen2/3).
Actually our abstraction may be a bit off: sometimes that bit may gate
multiple clocks leading to the module, but as that was never documented
well, we settled on a single functional clock only, which is the most
common case.
> So the fclk in the dts is mod clock 415 (416 for the second dsi), which
> is dsitxlink0 or dsitxlink1. Well, those names don't quite make sense if
> it's a fclk.
>
> I would rename those clocks to "dsi0" and "dsi1", and source them from
> R8A779G0_CLK_VIOBUSD2, similarly to the other video clocks.
>
> Does the above make sense?
Please keep the names, as that's how they are called in Section 9.2.3.5
("Module Stop Control Register 4 (MSTPCR4)").
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
Re: [PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Hi Tomi,
On Thu, Dec 1, 2022 at 10:06 AM Tomi Valkeinen
wrote:
> On 30/11/2022 21:18, Geert Uytterhoeven wrote:
> > On Wed, Nov 23, 2022 at 8:00 AM Tomi Valkeinen
> > wrote:
> >> Add clocks related to display which are needed to get the DSI output
> >> working.
> >>
> >> Extracted from Renesas BSP tree.
> >>
> >> Signed-off-by: Tomi Valkeinen
> >> Reviewed-by: Kieran Bingham
> >> Reviewed-by: Laurent Pinchart
> > Not that all of this matters a lot: all of these parents are always-on,
> > and I think "dis0" is the only clock where we care about the actual
> > clock rate?
>
> No, of the clocks added above, in the drivers we only care about the
> dsiref rate. That's used for the DSI PLL, and that PLL is used as the
> DU's pclk.
IC. As the DU node has only a single clocks property, I thought that
clock is used to derive the pixel clock from.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
Re: [PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Hi Tomi,
On Wed, Nov 23, 2022 at 8:00 AM Tomi Valkeinen
wrote:
> Add clocks related to display which are needed to get the DSI output
> working.
>
> Extracted from Renesas BSP tree.
>
> Signed-off-by: Tomi Valkeinen
> Reviewed-by: Kieran Bingham
> Reviewed-by: Laurent Pinchart
Thanks for your patch!
> --- a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
> +++ b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
> @@ -145,6 +145,8 @@ static const struct cpg_core_clk r8a779g0_core_clks[]
> __initconst = {
> DEF_FIXED("viobusd2", R8A779G0_CLK_VIOBUSD2, CLK_VIO,2, 1),
> DEF_FIXED("vcbus", R8A779G0_CLK_VCBUS, CLK_VC, 1, 1),
> DEF_FIXED("vcbusd2",R8A779G0_CLK_VCBUSD2, CLK_VC, 2, 1),
> + DEF_FIXED("dsiref", R8A779G0_CLK_DSIREF,CLK_PLL5_DIV4, 48,
> 1),
> + DEF_DIV6P1("dsiext",R8A779G0_CLK_DSIEXT,CLK_PLL5_DIV4,
> 0x884),
>
> DEF_GEN4_SDH("sd0h",R8A779G0_CLK_SD0H, CLK_SDSRC,
> 0x870),
> DEF_GEN4_SD("sd0", R8A779G0_CLK_SD0, R8A779G0_CLK_SD0H,
> 0x870),
> @@ -161,6 +163,14 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
> __initconst = {
> DEF_MOD("avb0", 211,R8A779G0_CLK_S0D4_HSC),
> DEF_MOD("avb1", 212,R8A779G0_CLK_S0D4_HSC),
> DEF_MOD("avb2", 213,R8A779G0_CLK_S0D4_HSC),
> +
Weird horizontal and vertical spacing below...
> + DEF_MOD("dis0", 411,R8A779G0_CLK_S0D3),
I doubt this parent clock is correct.
Based on Table 8.1.4e ("Lists of CPG clocks generated from PLL5"),
this should be one of the VIOBUS clocks.
VIOBUSD2 has the same rate as S0D3, so I'd use that one.
> + DEF_MOD("dsitxlink0", 415,R8A779G0_CLK_DSIREF),
> + DEF_MOD("dsitxlink1", 416,R8A779G0_CLK_DSIREF),
> +
> + DEF_MOD("fcpvd0", 508,R8A779G0_CLK_S0D3),
> + DEF_MOD("fcpvd1", 509,R8A779G0_CLK_S0D3),
Likewise.
> +
> DEF_MOD("hscif0", 514,R8A779G0_CLK_SASYNCPERD1),
> DEF_MOD("hscif1", 515,R8A779G0_CLK_SASYNCPERD1),
> DEF_MOD("hscif2", 516,R8A779G0_CLK_SASYNCPERD1),
> @@ -193,6 +203,10 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
> __initconst = {
> DEF_MOD("tmu3", 716,R8A779G0_CLK_SASYNCPERD2),
> DEF_MOD("tmu4", 717,R8A779G0_CLK_SASYNCPERD2),
> DEF_MOD("tpu0", 718,R8A779G0_CLK_SASYNCPERD4),
> +
> + DEF_MOD("vspd0",830,R8A779G0_CLK_S0D1_VIO),
> + DEF_MOD("vspd1",831,R8A779G0_CLK_S0D1_VIO),
While S0D1_VIO is a VIO clock, it is clocked from PLL1, which supports
spread-spectrum, unlike PLL5.
Again, based on Table 8.1.4e ("Lists of CPG clocks generated from
PLL5"), this should be one of the VIOBUS clocks.
Not that all of this matters a lot: all of these parents are always-on,
and I think "dis0" is the only clock where we care about the actual
clock rate?
> +
> DEF_MOD("wdt1:wdt0",907,R8A779G0_CLK_R),
> DEF_MOD("cmt0", 910,R8A779G0_CLK_R),
> DEF_MOD("cmt1", 911,R8A779G0_CLK_R),
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
[PATCH v2 3/7] clk: renesas: r8a779g0: Add display related clocks
Add clocks related to display which are needed to get the DSI output
working.
Extracted from Renesas BSP tree.
Signed-off-by: Tomi Valkeinen
Reviewed-by: Kieran Bingham
Reviewed-by: Laurent Pinchart
---
drivers/clk/renesas/r8a779g0-cpg-mssr.c | 14 ++
1 file changed, 14 insertions(+)
diff --git a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
index c6337a408e5e..6937f1aee677 100644
--- a/drivers/clk/renesas/r8a779g0-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a779g0-cpg-mssr.c
@@ -145,6 +145,8 @@ static const struct cpg_core_clk r8a779g0_core_clks[]
__initconst = {
DEF_FIXED("viobusd2", R8A779G0_CLK_VIOBUSD2, CLK_VIO,2, 1),
DEF_FIXED("vcbus", R8A779G0_CLK_VCBUS, CLK_VC, 1, 1),
DEF_FIXED("vcbusd2",R8A779G0_CLK_VCBUSD2, CLK_VC, 2, 1),
+ DEF_FIXED("dsiref", R8A779G0_CLK_DSIREF,CLK_PLL5_DIV4, 48, 1),
+ DEF_DIV6P1("dsiext",R8A779G0_CLK_DSIEXT,CLK_PLL5_DIV4, 0x884),
DEF_GEN4_SDH("sd0h",R8A779G0_CLK_SD0H, CLK_SDSRC,
0x870),
DEF_GEN4_SD("sd0", R8A779G0_CLK_SD0, R8A779G0_CLK_SD0H,
0x870),
@@ -161,6 +163,14 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
__initconst = {
DEF_MOD("avb0", 211,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb1", 212,R8A779G0_CLK_S0D4_HSC),
DEF_MOD("avb2", 213,R8A779G0_CLK_S0D4_HSC),
+
+ DEF_MOD("dis0", 411,R8A779G0_CLK_S0D3),
+ DEF_MOD("dsitxlink0", 415,R8A779G0_CLK_DSIREF),
+ DEF_MOD("dsitxlink1", 416,R8A779G0_CLK_DSIREF),
+
+ DEF_MOD("fcpvd0", 508,R8A779G0_CLK_S0D3),
+ DEF_MOD("fcpvd1", 509,R8A779G0_CLK_S0D3),
+
DEF_MOD("hscif0", 514,R8A779G0_CLK_SASYNCPERD1),
DEF_MOD("hscif1", 515,R8A779G0_CLK_SASYNCPERD1),
DEF_MOD("hscif2", 516,R8A779G0_CLK_SASYNCPERD1),
@@ -193,6 +203,10 @@ static const struct mssr_mod_clk r8a779g0_mod_clks[]
__initconst = {
DEF_MOD("tmu3", 716,R8A779G0_CLK_SASYNCPERD2),
DEF_MOD("tmu4", 717,R8A779G0_CLK_SASYNCPERD2),
DEF_MOD("tpu0", 718,R8A779G0_CLK_SASYNCPERD4),
+
+ DEF_MOD("vspd0",830,R8A779G0_CLK_S0D1_VIO),
+ DEF_MOD("vspd1",831,R8A779G0_CLK_S0D1_VIO),
+
DEF_MOD("wdt1:wdt0",907,R8A779G0_CLK_R),
DEF_MOD("cmt0", 910,R8A779G0_CLK_R),
DEF_MOD("cmt1", 911,R8A779G0_CLK_R),
--
2.34.1
