diff mbox series

[06/10] clk: mediatek: mt6795-topckgen: Drop flags for main/sys/univpll fixed factors

Message ID 20221024102307.33722-7-angelogioacchino.delregno@collabora.com (mailing list archive)
State New, archived
Headers show
Series MTK: Undesired set_rate on main PLLs and GPU DVFS | expand

Commit Message

AngeloGioacchino Del Regno Oct. 24, 2022, 10:23 a.m. UTC 
The main/sys/univpll clocks are used as clock sources for multiple
peripherals of different kind, some of which are critical (like AXIs);
a rate change on any of these two will produce a rate change on many
devices and that's likely to produce system instability if not done
correctly: this is the reason why we have (a lot of) "fixed factor"
main/sys/univpll divider clocks, used by MUX clocks to provide
different rates based on PLL output dividers.

Following what was done on clk-mt8186-topckgen and also preventing the
same GPU DVFS issue, drop CLK_SET_RATE_PARENT from the aforementioned
clocks.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/clk/mediatek/clk-mt6795-topckgen.c | 76 +++++++++++-----------
 1 file changed, 38 insertions(+), 38 deletions(-)

Comments

Chen-Yu Tsai Oct. 24, 2022, 10:09 p.m. UTC | #1 
On Mon, Oct 24, 2022 at 3:23 AM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> The main/sys/univpll clocks are used as clock sources for multiple
> peripherals of different kind, some of which are critical (like AXIs);
> a rate change on any of these two will produce a rate change on many
> devices and that's likely to produce system instability if not done
> correctly: this is the reason why we have (a lot of) "fixed factor"
> main/sys/univpll divider clocks, used by MUX clocks to provide
> different rates based on PLL output dividers.
>
> Following what was done on clk-mt8186-topckgen and also preventing the
> same GPU DVFS issue, drop CLK_SET_RATE_PARENT from the aforementioned
> clocks.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>

Looks good to me, but I'm less familiar with the design of this chip.
diff mbox series

Patch

diff --git a/drivers/clk/mediatek/clk-mt6795-topckgen.c b/drivers/clk/mediatek/clk-mt6795-topckgen.c
index 2948dd1aee8f..8b8307635a35 100644
--- a/drivers/clk/mediatek/clk-mt6795-topckgen.c
+++ b/drivers/clk/mediatek/clk-mt6795-topckgen.c
@@ -359,19 +359,19 @@  static const struct mtk_fixed_factor top_divs[] = {
 	FACTOR(CLK_TOP_ARMCA53PLL_754M, "armca53pll_754m", "clk26m", 1, 2),
 	FACTOR(CLK_TOP_ARMCA53PLL_502M, "armca53pll_502m", "clk26m", 1, 3),
 
-	FACTOR(CLK_TOP_MAIN_H546M, "main_h546m", "mainpll", 1, 2),
-	FACTOR(CLK_TOP_MAIN_H364M, "main_h364m", "mainpll", 1, 3),
-	FACTOR(CLK_TOP_MAIN_H218P4M, "main_h218p4m", "mainpll", 1, 5),
-	FACTOR(CLK_TOP_MAIN_H156M, "main_h156m", "mainpll", 1, 7),
+	FACTOR_FLAGS(CLK_TOP_MAIN_H546M, "main_h546m", "mainpll", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_MAIN_H364M, "main_h364m", "mainpll", 1, 3, 0),
+	FACTOR_FLAGS(CLK_TOP_MAIN_H218P4M, "main_h218p4m", "mainpll", 1, 5, 0),
+	FACTOR_FLAGS(CLK_TOP_MAIN_H156M, "main_h156m", "mainpll", 1, 7, 0),
 
 	FACTOR(CLK_TOP_TVDPLL_445P5M, "tvdpll_445p5m", "tvdpll", 1, 4),
 	FACTOR(CLK_TOP_TVDPLL_594M, "tvdpll_594m", "tvdpll", 1, 3),
 
-	FACTOR(CLK_TOP_UNIV_624M, "univ_624m", "univpll", 1, 2),
-	FACTOR(CLK_TOP_UNIV_416M, "univ_416m", "univpll", 1, 3),
-	FACTOR(CLK_TOP_UNIV_249P6M, "univ_249p6m", "univpll", 1, 5),
-	FACTOR(CLK_TOP_UNIV_178P3M, "univ_178p3m", "univpll", 1, 7),
-	FACTOR(CLK_TOP_UNIV_48M, "univ_48m", "univpll", 1, 26),
+	FACTOR_FLAGS(CLK_TOP_UNIV_624M, "univ_624m", "univpll", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIV_416M, "univ_416m", "univpll", 1, 3, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIV_249P6M, "univ_249p6m", "univpll", 1, 5, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIV_178P3M, "univ_178p3m", "univpll", 1, 7, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIV_48M, "univ_48m", "univpll", 1, 26, 0),
 
 	FACTOR(CLK_TOP_CLKRTC_EXT, "clkrtc_ext", "clk32k", 1, 1),
 	FACTOR(CLK_TOP_CLKRTC_INT, "clkrtc_int", "clk26m", 1, 793),
@@ -402,20 +402,20 @@  static const struct mtk_fixed_factor top_divs[] = {
 	FACTOR(CLK_TOP_MSDCPLL2_D2, "msdcpll2_d2", "msdcpll2", 1, 2),
 	FACTOR(CLK_TOP_MSDCPLL2_D4, "msdcpll2_d4", "msdcpll2", 1, 4),
 
-	FACTOR(CLK_TOP_SYSPLL_D2, "syspll_d2", "main_h546m", 1, 1),
-	FACTOR(CLK_TOP_SYSPLL1_D2, "syspll1_d2", "main_h546m", 1, 2),
-	FACTOR(CLK_TOP_SYSPLL1_D4, "syspll1_d4", "main_h546m", 1, 4),
-	FACTOR(CLK_TOP_SYSPLL1_D8, "syspll1_d8", "main_h546m", 1, 8),
-	FACTOR(CLK_TOP_SYSPLL1_D16, "syspll1_d16", "main_h546m", 1, 16),
-	FACTOR(CLK_TOP_SYSPLL_D3, "syspll_d3", "main_h364m", 1, 1),
-	FACTOR(CLK_TOP_SYSPLL2_D2, "syspll2_d2", "main_h364m", 1, 2),
-	FACTOR(CLK_TOP_SYSPLL2_D4, "syspll2_d4", "main_h364m", 1, 4),
-	FACTOR(CLK_TOP_SYSPLL_D5, "syspll_d5", "main_h218p4m", 1, 1),
-	FACTOR(CLK_TOP_SYSPLL3_D2, "syspll3_d2", "main_h218p4m", 1, 2),
-	FACTOR(CLK_TOP_SYSPLL3_D4, "syspll3_d4", "main_h218p4m", 1, 4),
-	FACTOR(CLK_TOP_SYSPLL_D7, "syspll_d7", "main_h156m", 1, 1),
-	FACTOR(CLK_TOP_SYSPLL4_D2, "syspll4_d2", "main_h156m", 1, 2),
-	FACTOR(CLK_TOP_SYSPLL4_D4, "syspll4_d4", "main_h156m", 1, 4),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL_D2, "syspll_d2", "main_h546m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL1_D2, "syspll1_d2", "main_h546m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL1_D4, "syspll1_d4", "main_h546m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL1_D8, "syspll1_d8", "main_h546m", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL1_D16, "syspll1_d16", "main_h546m", 1, 16, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL_D3, "syspll_d3", "main_h364m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL2_D2, "syspll2_d2", "main_h364m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL2_D4, "syspll2_d4", "main_h364m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL_D5, "syspll_d5", "main_h218p4m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL3_D2, "syspll3_d2", "main_h218p4m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL3_D4, "syspll3_d4", "main_h218p4m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL_D7, "syspll_d7", "main_h156m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL4_D2, "syspll4_d2", "main_h156m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_SYSPLL4_D4, "syspll4_d4", "main_h156m", 1, 4, 0),
 
 	FACTOR(CLK_TOP_TVDPLL, "tvdpll_ck", "tvdpll_594m", 1, 1),
 	FACTOR(CLK_TOP_TVDPLL_D2, "tvdpll_d2", "tvdpll_594m", 1, 2),
@@ -423,21 +423,21 @@  static const struct mtk_fixed_factor top_divs[] = {
 	FACTOR(CLK_TOP_TVDPLL_D8, "tvdpll_d8", "tvdpll_594m", 1, 8),
 	FACTOR(CLK_TOP_TVDPLL_D16, "tvdpll_d16", "tvdpll_594m", 1, 16),
 
-	FACTOR(CLK_TOP_UNIVPLL_D2, "univpll_d2", "univ_624m", 1, 1),
-	FACTOR(CLK_TOP_UNIVPLL1_D2, "univpll1_d2", "univ_624m", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL1_D4, "univpll1_d4", "univ_624m", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL1_D8, "univpll1_d8", "univ_624m", 1, 8),
-	FACTOR(CLK_TOP_UNIVPLL_D3, "univpll_d3", "univ_416m", 1, 1),
-	FACTOR(CLK_TOP_UNIVPLL2_D2, "univpll2_d2", "univ_416m", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL2_D4, "univpll2_d4", "univ_416m", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL2_D8, "univpll2_d8", "univ_416m", 1, 8),
-	FACTOR(CLK_TOP_UNIVPLL_D5, "univpll_d5", "univ_249p6m", 1, 1),
-	FACTOR(CLK_TOP_UNIVPLL3_D2, "univpll3_d2", "univ_249p6m", 1, 2),
-	FACTOR(CLK_TOP_UNIVPLL3_D4, "univpll3_d4", "univ_249p6m", 1, 4),
-	FACTOR(CLK_TOP_UNIVPLL3_D8, "univpll3_d8", "univ_249p6m", 1, 8),
-	FACTOR(CLK_TOP_UNIVPLL_D7, "univpll_d7", "univ_178p3m", 1, 1),
-	FACTOR(CLK_TOP_UNIVPLL_D26, "univpll_d26", "univ_48m", 1, 1),
-	FACTOR(CLK_TOP_UNIVPLL_D52, "univpll_d52", "univ_48m", 1, 2),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D2, "univpll_d2", "univ_624m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL1_D2, "univpll1_d2", "univ_624m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL1_D4, "univpll1_d4", "univ_624m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL1_D8, "univpll1_d8", "univ_624m", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D3, "univpll_d3", "univ_416m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL2_D2, "univpll2_d2", "univ_416m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL2_D4, "univpll2_d4", "univ_416m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL2_D8, "univpll2_d8", "univ_416m", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D5, "univpll_d5", "univ_249p6m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL3_D2, "univpll3_d2", "univ_249p6m", 1, 2, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL3_D4, "univpll3_d4", "univ_249p6m", 1, 4, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL3_D8, "univpll3_d8", "univ_249p6m", 1, 8, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D7, "univpll_d7", "univ_178p3m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D26, "univpll_d26", "univ_48m", 1, 1, 0),
+	FACTOR_FLAGS(CLK_TOP_UNIVPLL_D52, "univpll_d52", "univ_48m", 1, 2, 0),
 
 	FACTOR(CLK_TOP_VCODECPLL, "vcodecpll_ck", "vcodecpll", 1, 3),
 	FACTOR(CLK_TOP_VCODECPLL_370P5, "vcodecpll_370p5", "vcodecpll", 1, 4),