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Commit c51c6f4b authored by Ravi Gummadidala's avatar Ravi Gummadidala
Browse files

msm: ipa: SW workaround for HW bug 



Zero out a status scratch buffer used by IPA HW for generating
aggregation empty packet status. If this scratch buffer is not
cleared, we will see garbage in the aggr empty status packet
generated as a result of aggregation timer expiry or due to
aggregation force close.

Change-Id: I2c5fe334bf857211ce13ab85c98948f819742b2e
Signed-off-by: default avatarRavi Gummadidala <rgummadi@codeaurora.org>
parent c07b9ea7

drivers/platform/msm/ipa/ipa.c

+34 −2
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 
#define IPA_ROUTING_RULE_BYTE_SIZE (4)

#define IPA_BAM_CNFG_BITS_VALv1_1 (0x7FFFE004)

#define IPA_BAM_CNFG_BITS_VALv2_0 (0xFFFFE004)

#define IPA_STATUS_CLEAR_OFST (0x3f28)

#define IPA_STATUS_CLEAR_SIZE (32)



#define IPA_AGGR_MAX_STR_LENGTH (10)
@@ -817,14 +819,20 @@ static int ipa_init_sram(void) 
{

	u32 *ipa_sram_mmio;

	unsigned long phys_addr;

	struct ipa_hw_imm_cmd_dma_shared_mem cmd = {0};

	struct ipa_desc desc = {0};

	struct ipa_mem_buffer mem;

	int rc = 0;



	phys_addr = ipa_ctx->ipa_wrapper_base + IPA_REG_BASE_OFST +

		IPA_SRAM_DIRECT_ACCESS_N_OFST_v2_0(

				ipa_ctx->smem_restricted_bytes / 4);

	ipa_sram_mmio = ioremap(phys_addr,

			ipa_ctx->smem_sz - ipa_ctx->smem_restricted_bytes);

	if (!ipa_sram_mmio)

	if (!ipa_sram_mmio) {

		IPAERR("fail to ioremap IPA SRAM\n");

		return -ENOMEM;

	}



#define IPA_SRAM_SET(ofst, val) (ipa_sram_mmio[(ofst - 4) / 4] = val)
@@ -839,7 +847,31 @@ static int ipa_init_sram(void) 
	IPA_SRAM_SET(IPA_v2_RAM_END_OFST, IPA_CANARY_VAL);



	iounmap(ipa_sram_mmio);

	return 0;



	mem.size = IPA_STATUS_CLEAR_SIZE;

	mem.base = dma_alloc_coherent(NULL, mem.size, &mem.phys_base,

			GFP_KERNEL);

	if (!mem.base) {

		IPAERR("fail to alloc DMA buff of size %d\n", mem.size);

		return -ENOMEM;

	}

	memset(mem.base, 0, mem.size);



	cmd.size = mem.size;

	cmd.system_addr = mem.phys_base;

	cmd.local_addr = IPA_STATUS_CLEAR_OFST;

	desc.opcode = IPA_DMA_SHARED_MEM;

	desc.pyld = &cmd;

	desc.len = sizeof(struct ipa_hw_imm_cmd_dma_shared_mem);

	desc.type = IPA_IMM_CMD_DESC;



	if (ipa_send_cmd(1, &desc)) {

		IPAERR("fail to send immediate command\n");

		rc = -EFAULT;

	}



	dma_free_coherent(NULL, mem.size, mem.base, mem.phys_base);

	return rc;

}



static int ipa_init_hdr(void)