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remoteproc: mediatek: Fix side effect of mt8195 sram power on 

The definition of L1TCM_SRAM_PDN bits on mt8195 is different to mt8192.

L1TCM_SRAM_PDN bits[3:0] control the power of mt8195 L1TCM SRAM.

L1TCM_SRAM_PDN bits[7:4] control the access path to EMI for SCP.
These bits have to be powered on to allow EMI access for SCP.

Bits[7:4] also affect audio DSP because audio DSP and SCP are
placed on the same hardware bus. If SCP cannot access EMI, audio DSP is
blocked too.

L1TCM_SRAM_PDN bits[31:8] are not used.

This fix removes modification of bits[7:4] when power on/off mt8195 SCP
L1TCM. It's because the modification introduces a short period of time
blocking audio DSP to access EMI. This was not a problem until we have
to load both SCP module and audio DSP module. audio DSP needs to access
EMI because it has source/data on DRAM. Audio DSP will have unexpected
behavior when it accesses EMI and the SCP driver blocks the EMI path at
the same time.

Fixes: 79111df414 ("remoteproc: mediatek: Support mt8195 scp")
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20220321060340.10975-1-tinghan.shen@mediatek.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Tinghan Shen 2022-03-21 14:03:40 +08:00 committed by Mathieu Poirier
parent ce522ba9ef
commit f20e232d74
2 changed files with 54 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/remoteproc/mtk_common.h
View File

@ -54,6 +54,8 @@
#define MT8192_CORE0_WDT_IRQ 0x10030
#define MT8192_CORE0_WDT_CFG 0x10034
#define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS GENMASK(7, 4)
#define SCP_FW_VER_LEN 32
#define SCP_SHARE_BUFFER_SIZE 288

69
drivers/remoteproc/mtk_scp.c
View File

@ -365,22 +365,22 @@ static int mt8183_scp_before_load(struct mtk_scp *scp)
return 0;
}
static void mt8192_power_on_sram(void __iomem *addr)
static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask)
{
int i;
for (i = 31; i >= 0; i--)
writel(GENMASK(i, 0), addr);
writel(GENMASK(i, 0) & ~reserved_mask, addr);
writel(0, addr);
}
static void mt8192_power_off_sram(void __iomem *addr)
static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask)
{
int i;
writel(0, addr);
for (i = 0; i < 32; i++)
writel(GENMASK(i, 0), addr);
writel(GENMASK(i, 0) & ~reserved_mask, addr);
}
static int mt8186_scp_before_load(struct mtk_scp *scp)
@ -393,7 +393,7 @@ static int mt8186_scp_before_load(struct mtk_scp *scp)
writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
/* Turn on the power of SCP's SRAM before using it. Enable 1 block per time*/
mt8192_power_on_sram(scp->reg_base + MT8183_SCP_SRAM_PDN);
scp_sram_power_on(scp->reg_base + MT8183_SCP_SRAM_PDN, 0);
/* Initialize TCM before loading FW. */
writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
@ -412,11 +412,32 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
/* enable SRAM clock */
mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
/* enable MPU for all memory regions */
writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
return 0;
}
static int mt8195_scp_before_load(struct mtk_scp *scp)
{
/* clear SPM interrupt, SCP2SPM_IPC_CLR */
writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
/* enable SRAM clock */
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
/* enable MPU for all memory regions */
writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
@ -572,11 +593,25 @@ static void mt8183_scp_stop(struct mtk_scp *scp)
static void mt8192_scp_stop(struct mtk_scp *scp)
{
/* Disable SRAM clock */
mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
/* Disable SCP watchdog */
writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
}
static void mt8195_scp_stop(struct mtk_scp *scp)
{
/* Disable SRAM clock */
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
/* Disable SCP watchdog */
writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
@ -922,11 +957,11 @@ static const struct mtk_scp_of_data mt8192_of_data = {
static const struct mtk_scp_of_data mt8195_of_data = {
.scp_clk_get = mt8195_scp_clk_get,
.scp_before_load = mt8192_scp_before_load,
.scp_before_load = mt8195_scp_before_load,
.scp_irq_handler = mt8192_scp_irq_handler,
.scp_reset_assert = mt8192_scp_reset_assert,
.scp_reset_deassert = mt8192_scp_reset_deassert,
.scp_stop = mt8192_scp_stop,
.scp_stop = mt8195_scp_stop,
.scp_da_to_va = mt8192_scp_da_to_va,
.host_to_scp_reg = MT8192_GIPC_IN_SET,
.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,