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Wysocki" , Kyungmin Park , kernel@pengutronix.de, Fabio Estevam , Georgi Djakov Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Oct 31, 2019 at 11:50:22PM +0200, Leonard Crestez wrote: > These clocks are only modified as part of DRAM frequency switches during > which DRAM itself is briefly inaccessible. The switch is performed with > a SMC call to by TF-A which runs from a SRAM area; upon returning to > linux several clocks bits are modified and we need to update them. > > For rate bits an easy solution is to just mark with > CLK_GET_RATE_NOCACHE so that new rates are always read back from > registers. > > Signed-off-by: Leonard Crestez > --- > drivers/clk/imx/clk-imx8mm.c | 11 +++++++++-- > drivers/clk/imx/clk-imx8mn.c | 12 ++++++++++-- > drivers/clk/imx/clk-imx8mq.c | 15 +++++++++++---- > 3 files changed, 30 insertions(+), 8 deletions(-) > > diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c > index 030b15d7c0ce..c58f988191a5 100644 > --- a/drivers/clk/imx/clk-imx8mm.c > +++ b/drivers/clk/imx/clk-imx8mm.c > @@ -440,13 +440,20 @@ static int imx8mm_clocks_probe(struct platform_device *pdev) > > /* IPG */ > clks[IMX8MM_CLK_IPG_ROOT] = imx_clk_divider2("ipg_root", "ahb", base + 0x9080, 0, 1); > clks[IMX8MM_CLK_IPG_AUDIO_ROOT] = imx_clk_divider2("ipg_audio_root", "audio_ahb", base + 0x9180, 0, 1); > > + /* > + * DRAM clocks are manipulated from TF-A outside clock framework. > + * Mark with GET_RATE_NOCACHE to always read div value from hardware > + */ > + clks[IMX8MM_CLK_DRAM_ALT] = __imx8m_clk_composite("dram_alt", imx8mm_dram_alt_sels, base + 0xa000, > + CLK_GET_RATE_NOCACHE); > + clks[IMX8MM_CLK_DRAM_APB] = __imx8m_clk_composite("dram_apb", imx8mm_dram_apb_sels, base + 0xa080, > + CLK_IS_CRITICAL | CLK_GET_RATE_NOCACHE); > + I think we prefer to ignore over-80-column warnings for i.MX clock drivers, because doing that improve the readability of code. Shawn > /* IP */ > - clks[IMX8MM_CLK_DRAM_ALT] = imx8m_clk_composite("dram_alt", imx8mm_dram_alt_sels, base + 0xa000); > - clks[IMX8MM_CLK_DRAM_APB] = imx8m_clk_composite_critical("dram_apb", imx8mm_dram_apb_sels, base + 0xa080); > clks[IMX8MM_CLK_VPU_G1] = imx8m_clk_composite("vpu_g1", imx8mm_vpu_g1_sels, base + 0xa100); > clks[IMX8MM_CLK_VPU_G2] = imx8m_clk_composite("vpu_g2", imx8mm_vpu_g2_sels, base + 0xa180); > clks[IMX8MM_CLK_DISP_DTRC] = imx8m_clk_composite("disp_dtrc", imx8mm_disp_dtrc_sels, base + 0xa200); > clks[IMX8MM_CLK_DISP_DC8000] = imx8m_clk_composite("disp_dc8000", imx8mm_disp_dc8000_sels, base + 0xa280); > clks[IMX8MM_CLK_PCIE1_CTRL] = imx8m_clk_composite("pcie1_ctrl", imx8mm_pcie1_ctrl_sels, base + 0xa300); > diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c > index 9f5a5a56b45e..ca78cb1249a7 100644 > --- a/drivers/clk/imx/clk-imx8mn.c > +++ b/drivers/clk/imx/clk-imx8mn.c > @@ -428,12 +428,20 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) > clks[IMX8MN_CLK_AHB] = imx8m_clk_composite_critical("ahb", imx8mn_ahb_sels, base + 0x9000); > clks[IMX8MN_CLK_AUDIO_AHB] = imx8m_clk_composite("audio_ahb", imx8mn_audio_ahb_sels, base + 0x9100); > clks[IMX8MN_CLK_IPG_ROOT] = imx_clk_divider2("ipg_root", "ahb", base + 0x9080, 0, 1); > clks[IMX8MN_CLK_IPG_AUDIO_ROOT] = imx_clk_divider2("ipg_audio_root", "audio_ahb", base + 0x9180, 0, 1); > clks[IMX8MN_CLK_DRAM_CORE] = imx_clk_mux2_flags("dram_core_clk", base + 0x9800, 24, 1, imx8mn_dram_core_sels, ARRAY_SIZE(imx8mn_dram_core_sels), CLK_IS_CRITICAL); > - clks[IMX8MN_CLK_DRAM_ALT] = imx8m_clk_composite("dram_alt", imx8mn_dram_alt_sels, base + 0xa000); > - clks[IMX8MN_CLK_DRAM_APB] = imx8m_clk_composite_critical("dram_apb", imx8mn_dram_apb_sels, base + 0xa080); > + > + /* > + * DRAM clocks are manipulated from TF-A outside clock framework. > + * Mark with GET_RATE_NOCACHE to always read div value from hardware > + */ > + clks[IMX8MN_CLK_DRAM_ALT] = __imx8m_clk_composite("dram_alt", imx8mn_dram_alt_sels, base + 0xa000, > + CLK_GET_RATE_NOCACHE); > + clks[IMX8MN_CLK_DRAM_APB] = __imx8m_clk_composite("dram_apb", imx8mn_dram_apb_sels, base + 0xa080, > + CLK_IS_CRITICAL | CLK_GET_RATE_NOCACHE); > + > clks[IMX8MN_CLK_DISP_PIXEL] = imx8m_clk_composite("disp_pixel", imx8mn_disp_pixel_sels, base + 0xa500); > clks[IMX8MN_CLK_SAI2] = imx8m_clk_composite("sai2", imx8mn_sai2_sels, base + 0xa600); > clks[IMX8MN_CLK_SAI3] = imx8m_clk_composite("sai3", imx8mn_sai3_sels, base + 0xa680); > clks[IMX8MN_CLK_SAI5] = imx8m_clk_composite("sai5", imx8mn_sai5_sels, base + 0xa780); > clks[IMX8MN_CLK_SAI6] = imx8m_clk_composite("sai6", imx8mn_sai6_sels, base + 0xa800); > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c > index 4a5dbc4366a5..ceb1e79cf2e9 100644 > --- a/drivers/clk/imx/clk-imx8mq.c > +++ b/drivers/clk/imx/clk-imx8mq.c > @@ -341,11 +341,12 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) > clks[IMX8MQ_VIDEO_PLL1_OUT] = imx_clk_gate("video_pll1_out", "video_pll1_bypass", base + 0x10, 21); > > clks[IMX8MQ_SYS1_PLL_OUT] = imx_clk_fixed("sys1_pll_out", 800000000); > clks[IMX8MQ_SYS2_PLL_OUT] = imx_clk_fixed("sys2_pll_out", 1000000000); > clks[IMX8MQ_SYS3_PLL_OUT] = imx_clk_sccg_pll("sys3_pll_out", sys3_pll_out_sels, ARRAY_SIZE(sys3_pll_out_sels), 0, 0, 1, base + 0x48, CLK_IS_CRITICAL); > - clks[IMX8MQ_DRAM_PLL_OUT] = imx_clk_sccg_pll("dram_pll_out", dram_pll_out_sels, ARRAY_SIZE(dram_pll_out_sels), 0, 0, 0, base + 0x60, CLK_IS_CRITICAL); > + clks[IMX8MQ_DRAM_PLL_OUT] = imx_clk_sccg_pll("dram_pll_out", dram_pll_out_sels, ARRAY_SIZE(dram_pll_out_sels), 0, 0, 0, base + 0x60, > + CLK_IS_CRITICAL | CLK_GET_RATE_NOCACHE); > clks[IMX8MQ_VIDEO2_PLL_OUT] = imx_clk_sccg_pll("video2_pll_out", video2_pll_out_sels, ARRAY_SIZE(video2_pll_out_sels), 0, 0, 0, base + 0x54, 0); > > /* SYS PLL1 fixed output */ > clks[IMX8MQ_SYS1_PLL_40M_CG] = imx_clk_gate("sys1_pll_40m_cg", "sys1_pll_out", base + 0x30, 9); > clks[IMX8MQ_SYS1_PLL_80M_CG] = imx_clk_gate("sys1_pll_80m_cg", "sys1_pll_out", base + 0x30, 11); > @@ -433,15 +434,21 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) > > /* IPG */ > clks[IMX8MQ_CLK_IPG_ROOT] = imx_clk_divider2("ipg_root", "ahb", base + 0x9080, 0, 1); > clks[IMX8MQ_CLK_IPG_AUDIO_ROOT] = imx_clk_divider2("ipg_audio_root", "audio_ahb", base + 0x9180, 0, 1); > > - /* IP */ > + /* > + * DRAM clocks are manipulated from TF-A outside clock framework. > + * Mark with GET_RATE_NOCACHE to always read div value from hardware > + */ > clks[IMX8MQ_CLK_DRAM_CORE] = imx_clk_mux2_flags("dram_core_clk", base + 0x9800, 24, 1, imx8mq_dram_core_sels, ARRAY_SIZE(imx8mq_dram_core_sels), CLK_IS_CRITICAL); > + clks[IMX8MQ_CLK_DRAM_ALT] = __imx8m_clk_composite("dram_alt", imx8mq_dram_alt_sels, base + 0xa000, > + CLK_GET_RATE_NOCACHE); > + clks[IMX8MQ_CLK_DRAM_APB] = __imx8m_clk_composite("dram_apb", imx8mq_dram_apb_sels, base + 0xa080, > + CLK_IS_CRITICAL | CLK_GET_RATE_NOCACHE); > > - clks[IMX8MQ_CLK_DRAM_ALT] = imx8m_clk_composite("dram_alt", imx8mq_dram_alt_sels, base + 0xa000); > - clks[IMX8MQ_CLK_DRAM_APB] = imx8m_clk_composite_critical("dram_apb", imx8mq_dram_apb_sels, base + 0xa080); > + /* IP */ > clks[IMX8MQ_CLK_VPU_G1] = imx8m_clk_composite("vpu_g1", imx8mq_vpu_g1_sels, base + 0xa100); > clks[IMX8MQ_CLK_VPU_G2] = imx8m_clk_composite("vpu_g2", imx8mq_vpu_g2_sels, base + 0xa180); > clks[IMX8MQ_CLK_DISP_DTRC] = imx8m_clk_composite("disp_dtrc", imx8mq_disp_dtrc_sels, base + 0xa200); > clks[IMX8MQ_CLK_DISP_DC8000] = imx8m_clk_composite("disp_dc8000", imx8mq_disp_dc8000_sels, base + 0xa280); > clks[IMX8MQ_CLK_PCIE1_CTRL] = imx8m_clk_composite("pcie1_ctrl", imx8mq_pcie1_ctrl_sels, base + 0xa300); > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel